Growth and survival of juvenile red abalone (Haliotis rufescens) fed with macroalgae enriched with a benthic diatom film.ABSTRACT The objective of this work was to evaluate the growth rate of 150-day-old juvenile abalone abalone (ăbəlō`nē), popular name in the United States for a univalve gastropod mollusk of the genus Haliotis, members of which are also called ear shells, or sea ears, as their shape resembles the human ear. Haliotis rufescens fed with blades of the seaweed seaweed, name commonly used for the multicellular marine algae. Simpler forms, consisting of one cell (e.g., the diatom) or of a few cells, are not generally called seaweeds; these tiny plants help to make up plankton. Macrocystis pyrifera epiphyted with a film of the benthic ben·thos
1. The collection of organisms living on or in sea or lake bottoms.
2. The bottom of a sea or lake.
[Greek. diatom diatom (dī`ətŏm', -tōm'), unicellular organism of the kingdom Protista, characterized by a silica shell of often intricate and beautiful sculpturing. Most diatoms exist singly, although some join to form colonies. Navicula incerta. Five treatments were used as food for juvenile abalone: (1) blades of M. pyrifera washed for 10 min with fresh water to remove natural epiphytes; (2) blades of M. pyrifera without natural epiphytes and colonized Colonized
This occurs when a microorganism is found on or in a person without causing a disease.
Mentioned in: Isolation with N. incerta at an initial density of approximately 500 cells [mm-.sup.2]; (3) blades of M. pyrifera with natural epiphytes; (4) blades of M. pyrifera with natural epiphytes and colonized with N. incerta; and (5) batch cultures of N. incerta without blades. All treatments were kept on 18-L plastic buckets with 10 L of "f/2" medium at 16[degrees]C and 100 [micro]E[m.sup.2][s.sup.-1] of continuous light. All treatments were kept under culture conditions for 2 days. Plastic buckets of 18 L filled with 10 L of filtered seawater seawater
Water that makes up the oceans and seas. Seawater is a complex mixture of 96.5% water, 2.5% salts, and small amounts of other substances. Much of the world's magnesium is recovered from seawater, as are large quantities of bromine. at 16[degrees]C was used for the bioassay Bioassay
A method for the quantitation of the effects on a biological system by its exposure to a substance, as well as the quantitation of the concentration of a substance by some observable effect on a biological system. with the red abalone The red abalone, Haliotis rufescens, is a large brick colored mollusk that feeds on kelp and other algae along the coast of Oregon to Baja California. Being the largest, and most common abalone in the state it is the only species of abalone still commonly harvested in . The five feeding treatments were provided ad libitum ad libitum
ad libitum feeding
food available at all times with the quantity and frequency of consumption being the free choice of the animal. to juvenile abalone and were removed after 4 days. The water exchange rate in the buckets was ~300% per day. Every 15 days, and for a period of 90 days, weight and growth (as shell length and width) were measured. At the end of the experiment mortality was determined. The results showed that the highest growth rates Growth Rates
The compounded annualized rate of growth of a company's revenues, earnings, dividends, or other figures.
Remember, historically high growth rates don't always mean a high rate of growth looking into the future. and weight were observed in treatments 2, 4, and 5 whereas the lowest growth rates and weight were observed in treatments 1 and 3. The highest average survival was recorded in treatment 5 (52.17%), whereas the lowest was observed in treatment 2 (34.20%). This study showed that the enrichment of seaweed blades improves growth and survival in abalone and thus has potential to be used in abalone farms to enhance productivity.
KEY WORDS: benthic diatoms diatoms
a series of unicellular algae, microscopic in size, with cell walls containing silica. Members of the family Diatomaceae. Their remains accumulate as geological deposits and are mined. See diatomaceous earth. , epiphytes, seaweed, Haliotis rufescens, Navicula incerta, Macrocystis pyrifera
Commercial abalone culture in Mexico and California has traditionally been based on the supply of benthic diatoms as food for abalone postlarvae. When juvenile abalone reach a size of approximately 10 mm, the type of nourishment changes from benthic diatoms to seaweed. The main seaweed species used as food for juvenile and adult abalone are Macrocystis pyrifera, Nereocystis luetkeana, and Egregia menziesii, these and other brown seaweeds of the North Pacific coasts are abundant and easy to harvest from coastal waters (Hahn 1989, Buchal et al. 1998, McBride 1998).
The biochemical composition of seaweed varies among species and is related to the geographical zone Noun 1. geographical zone - any of the regions of the surface of the Earth loosely divided according to latitude or longitude
climatic zone - any of the geographical zones loosely divided according to prevailing climate and latitude , season, currents and wave exposure, nutrient availability, depth, temperature, and life stage of the algae algae (ăl`jē) [plural of Lat. alga=seaweed], a large and diverse group of primarily aquatic plantlike organisms. These organisms were previously classified as a primitive subkingdom of the plant kingdom, the thallophytes (plants that (Cruz-Suarez et al. 2000). This variability in nutritional value produces heterogeneous growth rates and, in some cases, low growth in abalone (Bautista-Teruel & Millamena 1999).
The biochemical composition of the seaweed Macrocystis pyrifera is poor, ranging from 5% to 12% proteins, 0.5% to 1% lipids, and 46% to 50% carbohydrates (Cruz-Suarez et al. 2000). Benthic diatoms have a much better biochemical composition, 22% to 36% proteins, 13% to 58% lipids, and 5% to 23% carbohydrates (Renaud et al. 1999, Simental-Trinidad et al. 2001).
When the food for juvenile abalone is changed from benthic diatoms to seaweed it is believed to reduce growth and survival, and may be a factor involved in high mortalities of the organisms under culture conditions. The biochemical composition of seaweed can be enhanced by the performance of a selective colonization over the surface of the blade with benthic diatoms. The aim of this work is to improve the growth rate and survival of juvenile red abalone (Haliotis rufescens) by enhancing the biochemical composition of its food (Macrocystis pyrifera) with a selective epyphitation of the seaweed blades with the benthic diatom Navicula incerta.
MATERIALS AND METHODS
Blades of the seaweed Mucrocystis pyrifera (excluding pneumatocysts) and cultures of the benthic diatom Navicula incerta were used in this work. The seaweed M. pyrifera was harvested every 4 days from a mantle located at Punta Morro (31[degrees]51'30"North, 116[degrees]38"38"West), on the coastal waters of Bahia Todos Santos Todos Santos can refer to:
Baja California (Span.: bä`hä kälēfōr`nyä), state (1990 pop. 1,660,855), 27,628 sq mi (71,576 sq km), NW Mexico, on the Baja California peninsula. Mexicali is the capital. (BC), Mexico. Every 4 days, from August to November 2002, seaweed was harvested at a depth of 2 m from the apical apical /ap·i·cal/ (ap´i-k'l) pertaining to an apex.
1. Relating to the apex of a pyramidal or pointed structure.
2. blades. The benthic diatom N. incerta was isolated from the same location by the staff of Universidad Autonoma de Baja California, and was also obtained by donation from the abalone farm "Abulones Cultivados" Ejido ejido (āhē`thō) [Span.,=common land], in Mexico, agricultural land expropriated from large private holdings and redistributed to communal farms. Erendira, BC, Mexico.
This study used 150-day-old juveniles of red abalone Haliotis rufescens, which were obtained from the earlier mentioned abalone farm. The abalone were selected to provide a group with an average shell length of 3.67 mm [+ or -] 0.32 and weight of 0.0055 g [+ or -] 0.0015. Organisms were acclimated to the experimental conditions for a period of 1 wk and fed M. pyrifera ad libitum.
Five treatments were used to provide food to juvenile abalone: (1) blades of M. pyrifera without natural epiphytes; (2) blades of M. pyrifera without natural epiphytes and colonized with N. incerta; (3) blades of M. pyrifera with natural epiphytes; (4) blades of M. pyrifera with natural epiphytes and colonized with N. incerta; and (5) batch cultures of N. incerta without blades.
All treatments were performed by triplicate and kept under controlled light irradiance ir·ra·di·ant
Sending forth radiant light.
[Latin irradi (100 [micro]E[m.sup.2][s.sup.-1]). The temperature for the experimental containers was maintained at 16[degrees]C by using an electronic controller.
The seawater used for all experiments was passed through sand and cartridge filters of 10 [micro]m and 5 [micro]m, and finally irradiated with ultraviolet light Ultraviolet light
A portion of the light spectrum not visible to the eye. Two bands of the UV spectrum, UVA and UVB, are used to treat psoriasis and other skin diseases. . Cultures of N. incerta were prepared for inoculum inoculum /in·oc·u·lum/ (-ok´u-lum) pl. inoc´ula material used in inoculation.
n. pl. in "f/2" medium (Guillard & Ryther 1962) in progressive volumes of 10 mL, 150 mL, 900 mL, and 10 L. The strain was acclimated to the culture conditions of temperature and continuous light previously described. For the production of the 10-L inoculum used in the bioassay with juvenile abalone, circular 18-L white plastic containers (30 x 35 cm) with a lexon acrylic lid at the top were used (Simental-Trinidad et al. 2001). An initial density of 150 organisms per container was used in the bioassay. Seawater was exchanged at approximately 300% per day.
For treatment 1, blades of M. pyrifera were washed with freshwater for 10 min to remove all the natural epiphytes. After the bath, sets of two blades were placed in the plastic container with 10 L of "f/2" medium. For treatment 2, blades of seaweed were treated similarly to those in treatment 1, and were inoculated with a 4-day-old culture of N. scerta at an initial density of 50,000 cells [ml.sup.-1] (obtaining approximately 500 cells [mm.sup.-2] on the blade surface). For treatment 3, the seaweed blades were placed into the containers without any previous washing or inoculation inoculation, in medicine, introduction of a preparation into the tissues or fluids of the body for the purpose of preventing or curing certain diseases. The preparation is usually a weakened culture of the agent causing the disease, as in vaccination against . For treatment 4, the blades of M. pyrifera without previous washing were inoculated with N. Incerta, similarly to the process described in treatment 2. Treatment 5 was a monospecific monospecific /mono·spe·cif·ic/ (mon?o-spe-sif´ik) having an effect only on a particular kind of cell or tissue or reacting with a single antigen, as a monospecific antiserum. culture of N. incerta with the same cell density as the one used in treatments 2 and 4.
Two days after the setting of the 5 treatments, all were given as food to the abalone ad libitum and left for 4 days, after that time, excess food was removed and new treatments were added to the containers.
Every 15 days, and for a period of 90 days, weight and shell length were obtained by randomly sampling 15 organisms. Weight was measured with an electronic scale and shell length was measured by using a calibrated cal·i·brate
tr.v. cal·i·brat·ed, cal·i·brat·ing, cal·i·brates
1. To check, adjust, or determine by comparison with a standard (the graduations of a quantitative measuring instrument): compound microscope compound microscope
A microscope consisting of an objective and an eyepiece at opposite ends of an adjustable tube. . At the end of the experiment, survival of juvenile abalone was determined. Daily growth rates, in terms of weight (DGw) and shell length (DGsl), were evaluated as described by Capinpin & Corre (1996). Growth rate was calculated as follows:
DGw ([micro]g per day) = Gw/n;
DGsl ([micro]m per day) = Gsl/n;
where Gw is the increase in weight ([micro]g), Gsl is the increase in shell length ([micro]m) and n are the days of rearing.
To determine if there were significant differences in weight through time as a result of different treatments, a covariance Covariance
A measure of the degree to which returns on two risky assets move in tandem. A positive covariance means that asset returns move together. A negative covariance means returns vary inversely. statistical analysis was used. The same analysis was performed to determine differences in shell length, and shell width. To determine if there were significant differences in growth rates, a 1-way Anova was used. When differences were detected, a Tukey a posteriori [Latin, From the effect to the cause.]
A posteriori describes a method of reasoning from given, express observations or experiments to reach and formulate general principles from them. This is also called inductive reasoning. test was performed. All the differences were evaluated at [alpha] = 0.05. For all statistical analysis, the software Statistica 5.0 for Windows was used.
Significant differences in weight among treatments were detected (F = 75.83, P < 0.00) (Fig. 1). The highest weights were detected in treatments 2 (0.100 g [+ or -] 0.005 SE) and 5 (0.080 g [+ or -] 0.004). The lowest abalone weights were obtained on treatments 1 (0.046 g [+ or -] 0.003 SE) and 3 (0.039 g [+ or -] 0.001 SE).
[FIGURE 1 OMITTED]
Shell length showed significant differences (F = 132.03, P < 0.00) (Fig. 2). The highest shell lengths were detected on treatments 2 (9.06 mm [+ or -] 0.09 SE) and 5 (8.81 mm [+ or -] 0.14 SE). The lowest shell lengths were detected on treatments 1 (6.76 mm [+ or -] 0.09 SE) and 3 (8.20 mm [+ or -] 014 SE).
[FIGURE 2 OMITTED]
Significant differences were obtained for shell width (F = 46.06, P < 0.00) (Fig. 3). A maximum value of shell width was recorded on treatment 2 (6.17 mm [+ or -] 0.010 SE). The lowest values were detected on treatments 1 (4.57 mm [+ or -] 0.07 SE) and 5 (5.66 mm [+ or -] 0.08 SE).
[FIGURE 3 OMITTED]
The average daily growth rate for the 5 treatments in terms of weight and shell length of abalone for 0-30 days, 30-60 days, and 60-90 days are shown in Table 1. DGw showed significant differences (F = 23.4, P < 0.00) on days 30-60 and 60-90. Abalone fed on treatments 2, 4, and 5 produced the highest growth rates in terms of weight. Regarding growth rate expressed as DGsl, a decrease was observed from day 30 until the end of the experiment. There were significant differences only during the 30-60 day period, when abalone were fed on treatments 2, 4, and 5 and where the highest growth rates in terms of shell length were recorded.
Minimum and maximum survival is presented in Table 2. There were significant differences between repetitions, with a minimum survival value recorded on treatment 2 (9.56%) and a maximum survival value on treatment 4 (82.60%).
In natural populations, abalone are nonselective feeders (Leighton & Boolootian 1963). In Mexican farms, where commercial abalone production is performed, food supply is based on seaweed instead of formulated diets. The seaweed is used mainly because of its availability, easy harvesting methods, and low cost. The main species used are Macrocystis pyrifera and Gracilaria spp. (Carbajal-Miranda pers. com. 2003). Juvenile begin to eat macroalgae at about 10 mm in length and will eat from 10% to 30% of their whole-body wet weight in algae each day. The high feeding rate of macroalgae is due to the high water content and relative low protein content of fresh macroalgae (Hahn 1989).
Usually, the protein content of benthic diatoms, such as Navicula sp. under culture conditions, varies according to according to
1. As stated or indicated by; on the authority of: according to historians.
2. In keeping with: according to instructions.
3. the age and culture conditions from 20% to 30%; whereas carbohydrate content ranges from 10% to 15%, and lipid content ranges between 15% to 20% (Flores-Vergara 1998, Correa-Reyes et al. 2001, Carbajal-Miranda 2002, Simental-Trinidad et al. 2001, Simental & Sanchez-Saavedra 2003).
In Mexican abalone farms, the change in nourishment, from microalgae to seaweed, is initiated when juvenile abalone are 3 mo old (Vazquez-Moreno pers. com. 2002) or when they are close to 10 mm in length. The daily seaweed portion that juvenile abalone receive ranges from 10% to 30% of their whole-body wet weight (Hahn 1989). According to Kawamura et al. (2001), the structure of the radula rad·u·la
n. pl. rad·u·lae
A flexible tonguelike organ in certain mollusks, having rows of horny teeth on the surface.
[Latin r and digestive abilities for the use of seaweed as food is ready at 2-4 mm shell length in H. discus discus /dis·cus/ (dis´kus) pl. dis´ci [L.] disk.
n. pl. dis·ci
A flat circular surface; a disk.
pl. disci [L.]
1. hannai, thus, the juvenile H. rufescens used in this experiment (3.67 [+ or -] 0.32 mm) were fully able to feed on seaweed.
In an experiment performed with deep-sea water and a continuous and simultaneous culture of the benthic diatom Nitzschia sp., used as food for 7-mo-old juvenile abalone Haliotis sieboldi (12.4 mm [+ or -] 0.2 Sd.), daily growth rate of the organisms was 50 to 110 [micro]m [day.sup.-1. Such results show that continuous cultivation of Navicula sp. with deep seawater promotes growth of juvenile abalone, without the need for providing supplementary seaweed or artificial diets (Fukami et al. 1997). The best growth rate in length and weight of H. rufescens was obtained from treatments with selective epyphitation or enriched with the benthic diatom Navicula incerta. Juvenile abalone retains the ability to digest diatoms after developing the ability to digest macroalgae. A combined diet of benthic diatoms and macroalgae provides greater nourishment and faster growth rate.
A common practice on abalone farms is the washing of the seaweed blades to avoid the introduction of other algae, microorganisms, and bacteria. However, research has shown that the epiphytes can contribute to an increase in the chemical composition of seaweed (Simental-Trinidad 2003). When abalone were fed with blades of Laminaria religiosa with bryozoa (Membranipora membranacea Membranipora membranacea is a very widely distributed species of marine bryozoan known from the Atlantic and Pacific Ocenas usually in temperate zone environments. It may be known colloquially as the sea-mat or lacy crust bryozoan ) on the surface, they grew faster than those fed with the same species without bryozoa. These are evidences that bryozoa probably supply complementary nourishment to the abalone (Uki 1981). Research suggests that abalone also can use bacteria, yeast, and other micro-organisms associated with diatoms as food (McBride & Conte 2001).
Benthic diatoms are the main diet for small abalone (Voltolina 1985, 1994, Daume et al. 1997, Daume et al. 1999, 2000, Kawamura 1996, Kawamura et al. 1998a, Kawamura et al. 1998b; Roberts 2000; Searcy-Bernal et al. 2000). Some diatoms in feces were observed to have cytoplasm cytoplasm: see protoplasm.
Portion of a eukaryotic cell outside the nucleus. The cytoplasm contains all the organelles (see eukaryote). and nuclear material and were therefore, assumed not to have been completely digested. In the gut content of Haliotis asinina collected from the natural environment, it was found that the main nourishment appears to be composed of benthic diatoms. Dominant genera genera, in taxonomy: see classification. in gut content were Nitzschia, Amphora, Navicula, and Cocconeis, which were the predominant floral elements in the local environment (Sawatpeera et al. 1998). Relatively few diatom strains are ruptured when eaten by abalone postlarvae. Postlarvae <1 mm in shell length can grow using extracellular extracellular /ex·tra·cel·lu·lar/ (-sel´u-lar) outside a cell or cells.
Located or occurring outside a cell or cells. foods such as mucus from adult abalone. Postlarvae > 1mm require the cell content of diatoms for rapid growth. The natural succession of diatom communities can be controlled, to some extent, by light and grazing grazing,
n See irregular feeding.
1. actions of herbivorous animals eating growing pasture or cereal crop.
2. area of pasture or cereal crop to be used as standing feed. See also pasture. pressure, thus, favoring useful diatoms (Roberts et al. 2000).
The nutritional value of monospecific cultures of eight benthic diatom species was determined for abalone postlarvae of Haliotis rufescens. The best growth rate, measured as shell length, was obtained when organisms were fed with Amphiprora paludosa var. hyalina, Nitzschia thermalis var. minor, and Navicula incerta (Correa-Reyes et al. 2001, Correa-Reyes 2002).
The growth rate obtained in this work varied from 9.15-63.32 [micro]m [day.sup.-1]. However, Kawamura et al. (1995) determined growth rates from 13.6-50.1 [micro]m [day.sup.1] in H. discus hannai fed with several benthic diatoms. Meanwhile, Neori et al. (2000) reported growth rate values of 66.6 [micro]m [day.sup.-1] in H. discus hannai fed with Ulva lactuca Ulva lactuca Linnaeus, a green alga in the Division Chlorophyta, is the type species of the genus Ulva, also known by the common name sea lettuce. Description
Ulva lactuca is a thin flat green alga growing from a discoid holdfast. or Gracilaria conferta. In this experiment we obtained better growth rates when abalone were fed with blades of seaweed containing benthic diatoms. Another important consideration is that both species (M. pyrifera and N. incerta) are commonly used on abalone farms in Mexico.
The use of seaweed as a food source on abalone farms has some other advantages due to the fact that they can also act as biologic filters and can be used as a coculture of abalone and seaweed (Evans & Langdon 2000). Thus, establishing the possibility for the use of systems with low water exchange or closed systems for the culture of abalone without the problem of loosing stability of formulated diets, which in some cases loose as much as 24% of dry matter in their pellets (Guzman & Viana 1998). Consequently, decreasing problems of waste removal and aeration aeration /aer·a·tion/ (ar-a´shun)
1. the exchange of carbon dioxide for oxygen by the blood in the lungs.
2. the charging of a liquid with air or gas.
n. , which are the main limiting factors, considered by many farmers, when using artificial diets (Fleming et al. 1996). Eutrophication eutrophication (ytrō'fĭkā`shən), aging of a lake by biological enrichment of its water. In a young lake the water is cold and clear, supporting little life. by nitrogen can reduce the diversity of communities, and produce low water quality (Hillebrand & Sommer Sommer is a surname, from the German and Danish word for the season "summer".
It may refer to:
A significant increase in weight and shell length for juvenile abalone was determined over time when the organisms were fed with the algae Macrocystis pyrifera, selective epiphytes with cultures of the benthic diatom Navicula incerta, and with the monocultures of N. incerta. Growth rate and survival of juvenile abalone (Haliotis rufescens) can be increased by using the seaweed Macrocystis pyrifera and selective epiphytes with cultures of the benthic diatom Navicula incerta as feed.
TABLE 1. Average daily growth rates in terms of weight (DGw) and shell length (DGsl) of red abalone Haliotis rufescens fed with different treatments * using the seaweed Macrocystis pyrifera and the benthic diatom Navicula incerta. DGw ([micro]g [day.sup.-1]) Treatment * Day 0-30 Day 30-60 1 323.53 a (7.41) 189.07 ab (53.12) 2 338.8942 a (67.66) 503.39 b (90.10) 3 206.50 a (57.97) 142.64 a (8.28) 4 298.97 a (66.07) 249.12 ab (65.38) 5 645.91 a (76.93) 208.06 a (51.1) DGw ([micro]g DGsI ([micro]g [day.sup.-1]) [day.sup.-1]) Treatment * Day 60-90 Day 0-30 1 234.81 a (95.48) 38.47 a (5.88) 2 824.53 b (203.84) 52.24 a (9.27) 3 208.43 a (87.05) 33.36 a (9.08) 4 577.34 ab (88.16) 35.68 a (1.78) 5 579.85 ab (194.62) 63.32 a (5.66) DGsI ([micro]g [day.sup.-1]) Treatment * Day 30-60 Day 60-90 1 19.17 ab (2.13) 9.15 a (4.10) 2 29.94 b (5.06) 25.01 a (3.90) 3 11.92 a (3.20) 12.09 a (6.01) 4 24.33 ab (2.95) 24.39 a (2.88) 5 15.29 ab (4.58) 27.14 a (7.19) * Treatments were: (1) Macrocystis pyrifera without natural epiphytes; (2) M. pyrifera without natural epiphytes and with a layer of Navicula incerta; (3) M. pyrifera with natural epiphytes; (4) M. pyrifera with natural epiphytes and with a layer of N. incerta; (5) Culture of N. incerta without blades. The standard error is included in parenthesis. The different letters on the side of the quantities indicate significant differences (1-way Anova and Tukey a posteriori test. ([alpha] = 0.05): a < b. TABLE 2. Average survival and minimum and maximum values due to replicates (expressed in percentages) of juvenile red abalone Haliotis rufescens, after twelve weeks of feeding with different treatments * using the seaweed Macrocystis pyrifera and the benthic diatom Navicula incerta. Survival Treatment * Average (%) Maximum (%) Minimum (%) 1 48.40 57.39 38.26 2 34.20 67.82 9.56 3 46.95 55.65 40.00 4 52.17 82.60 30.43 5 50.86 53.04 48.69 * Treatments were: (1) M. pyrifera without natural epiphytes: (2) M. pyrifera without natural epiphytes and with a layer of N. incerta; (3) M. pyrifera with natural epiphytes: (4) M. pyrifera with natural epiphytes and with a layer of N. incerta; (5) Culture of N. incerta without blades.
The authors thank M. Carbajal-Miranda, M. Pacheco-Vega, C. Cruz-Fraga and S. Fierro-Resendiz for technical assistance, and L. Salinas-Flores and M. Segovia-Quintero for manuscript revision. The authors also thank Consejo Nacional de Ciencia y Tecnologia (CONAC CONAC Continental Air Command
CONAC Center of North America Coalition for Rural Development (North Dakota, USA) y T) for the Ph. D scholarship to the first author. This work was supported by economic grants of Centro de Investigaci6n y de Educacion Superior de Ensenada (CICESE CICESE Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (Spanish) , Project 6554) and Consejo Nacional de Ciencia y Tecnologia (CONAC y T, Project 33016B).
Bautista-Teruel, M. N. & O. M. Millamena. 1999. Diet development and evaluation for juvenile abalone, Haliotis asinina: Protein/energy levels. Aquaculture aquaculture, the raising and harvesting of fresh- and saltwater plants and animals. The most economically important form of aquaculture is fish farming, an industry that accounts for an ever increasing share of world fisheries production. 178:117-126.
Buchal, M., J. E. Levin & C. Langdon. 1998. Dulse Palmaria mollis as settlement substrate and food for the red abalone Haliotis rufescens. Aquaculture 165:243-260.
Capinpin, E. C. & K. G. Corre. 1996. Growth rate of the Philippine abalone, Haliotis asinina fed an artificial diet and macroalgae. Aquaculture 144:81-89.
Carbajal-Miranda, M. J. 2002. Evaluacion del crecimiento de postlarvas de abulon rojo (Haliotis rufescens) utilizando como alimento una dieta monoespecifica y una dieta mixta de diatomeas bentonicas. M.Sc. Thesis. Departamento de Acuicultura. Centro de Investigacion Cientifica y de Educacion Superior de Ensenada. Ensenada Baja, California Mexico. 81 pp.
Correa-Reyes, J. G. 2002. Selecci6n de especies de diatomeas bentonicas para el cultivo del abulon. Ph. Thesis. Posgrado en Ciencias, Departamento de Acuicultura. Centro de lnvestigacion Cientifica y de Educacion Superior de Ensenada. Ensenada, Baja, California, Mexico. 135 pp.
Correa-Reyes, J. G., M. P. Sanchez-Saavedra, D. A. Siqueiros-Beltrones & N. Flores-Acevedo. 2001. Isolation and growth of eight strains of benthic diatoms, cultured under two light conditions. J. Shellfish shellfish, popular name for certain edible mollusks (see Mollusca), e.g., oysters, clams, and scallops, and for certain edible crustaceans, e.g., crabs, lobsters, and shrimps. All are aquatic invertebrates with shells; they are not fish. Res. 20(2):603-610.
Cruz-Suarez, L.E., D. Rique-Marie, M. Tapia-Salazar & M. Guajardo-Barbosa. 2000. Uso de la harina de kelp (Macrocystis pyrifera) en alimentos para camaron. In: L.E. Cruz-Suarez, D. Rique-Marie, M. Tapia-Salazar, M. A. Olvera-Navarro & R. Civera-Cercedo, editors. Avances en nutricion acuicola V. Memories of proceeding abstracts V International Symposium on Aquaculture Nutrition. Merida, Yucatan Mexico. 117 pp.
Daume, S., S. Brand & W. J. Woelkerling. 1997. Effects of postlarval abalone (Haliotis rubra) grazing on the ephiphytic diatom assemblage of coralline cor·al·line
1. Of, consisting of, or producing coral.
2. Resembling coral, especially in color.
1. red algae red algae: see seaweed; Rhodophyta. . Moll. Res. 18:119-130.
Daume, S., S. Brand-Gardner & W. J. Woelkerling. 1999. Preferential settlement of abalone larvae Larvae, in Roman religion
Larvae: see lemures. : diatom films vs. non-geniculate coralline red algae. Aquaculture 174:243-254.
Daume, S., A. Krsinich, S. Farrell & M. Gervis. 2000. Growth and survival of Haliotis rubra post-lavae feeding on different algal algal
pertaining to or caused by algae.
is very rare but systemic and udder infections are recorded. See protothecosis.
the algae Prototheca trispora and P. species. 4th International Abalone Symposium. Symposium Handbook. Cape Town Cape Town or Capetown, city (1991 pop. 854,616), legislative capital of South Africa and capital of Western Cape, a port on the Atlantic Ocean. It was the capital of Cape Province before that province's subdivision in 1994. , South Africa South Africa, Afrikaans Suid-Afrika, officially Republic of South Africa, republic (2005 est. pop. 44,344,000), 471,442 sq mi (1,221,037 sq km), S Africa. : University of Cape Town
“UCT” redirects here. For other uses, see UCT (disambiguation). . 92 pp.
Evans, F. & C. J. Langdon. 2000. Co-culture of dulse Palmaria mollis and red abalone Haliotis rufescens under limited flow conditions. Aquaculture 185:137-158.
Fleming, A. E., R. J. Van Barnevel & P. W. Hone. 1996. The development of artificial diets for abalone: a review and future directions. Aquaculture 140:5-53.
Flores-Vergara, C. 1998. Crecimiento y composicion bioquimica de microalgas bentonicas cultivadas bajo diferentes condiciones de temperatura e intensidad de luz. M. Sc. Thesis. Centro de Investigacion Cientifica y de Educacion Superior de Ensenada. Ensenada, Baja California
Ensenada is the third-largest city in the Mexican state of Baja California. It is located 116 km (about 70 miles) south of Tijuana, at . , Mexico. 101 pp.
Fukami, K., T. Nishijima & Y. Ishida. 1997. Stimulative and inhibitory effects of bacteria on growth on microalgae. Hydrobiologia 358:185-191.
Guillard, R. L. L. & J. H. Ryther. 1962. Studies on marine planktonic plank·ton
The collection of small or microscopic organisms, including algae and protozoans, that float or drift in great numbers in fresh or salt water, especially at or near the surface, and serve as food for fish and other larger organisms. diatoms I. Cyclotella nana Hustedt and Detonula confervacea (Cleve) Gran. Can. J. Microbiol. 8:229-239.
Guzman, J. M. & M. T. Viana. 1998. Growth of abalone Haliotis fulgens fed diets with and without fish meal, compared to a commercial diet. Aquaculture 165:321-331.
Hahn, K. O. 1989. Nutrition and growth of abalone. In: K. O. Hahn, editor. Handbook of culture of abalone and other marine gastropods. Boca Raton Boca Raton (bō`kə rətōn`), city (1990 pop. 61,492), Palm Beach co., SE Fla., on the Atlantic; inc. 1925. Boca Raton is a popular resort and retirement community that experienced significant industrial development in the 1970s and 80s. : CRC (Cyclical Redundancy Checking) An error checking technique used to ensure the accuracy of transmitting digital data. The transmitted messages are divided into predetermined lengths which, used as dividends, are divided by a fixed divisor. Press. pp. 135-156.
Hillebrand, H. & U. Sommer. 2000. Diversity of benthic microalgae in response to colonization time and eutrophication. Aquatic Botany 67: 221-236.
Kawamura, T., T. Saido, H. Takami & Y. Yamashita. 1995. Dietary value of benthic diatoms for the growth of post-larval abalone Haliotis discus hannai. J. Exp. Mar. Biol. Ecol. 194:189-199.
Kawamura, T. 1996. The role of benthic diatoms in the early life stages of the Japanese abalone (Haliotis discus hannai). In: Y. Watanabe, Y. Yamashita & Y. Oozeki, editors. Survival strategies in early life stages of marine resource. Brookfield: Balkema. pp 355-367.
Kawamura, T., R. D. Roberts & Ch. M. Nicholson. 1998a. Factors affecting the food value of diatom strains for post-larval abalone Haliotis iris. Aquaculture 160:81-88.
Kawamura, T., R. D. Roberts & H. Takami. 1998b. A review of the feeding and growth of postlarval abalone. J. Shellfish Res. 17(3):615-625.
Kawamura, T., H. Takami, R. D. Roberts & Y. Yamashita. 2001. Radula development in abalone Haliotis discus hannai from larva larva, in zoology
larva, independent, immature animal that undergoes a profound change, or metamorphosis, to assume the typical adult form. Larvae occur in almost all of the animal phyla; because most are tiny or microscopic, they are rarely seen. to adult in relation to feeding transitions. Fisheries Sci. 67:596-605.
Leighton, D. L. & E. Boolootian. 1963. Diet and growth of black abalone
McBride, S. & F. S. Conte. 2001. California abalone aquaculture. Bulletin of University of California, Davis The University of California, Davis, commonly known as UC Davis, is one of the ten campuses of the University of California, and was established as the University Farm in 1905. . Department of Animal Science 6-96:4.
McBride, S. C. 1998. Current status of abalone aquaculture in the California. J. Shellfish Res. 3:596-600.
Neori, A., M. Shpigel & D. Ben-Ezra. 2000. A sustainable integrated system for culture of fish, seaweed and abalone. Aquaculture 186:279-291.
Renaud, S. M., T. Luong-Van & D. L. Parry. 1999. The gross chemical composition and fatty acid fatty acid, any of the organic carboxylic acids present in fats and oils as esters of glycerol. Molecular weights of fatty acids vary over a wide range. The carbon skeleton of any fatty acid is unbranched. Some fatty acids are saturated, i.e. composition of 18 species of tropical Australian microalgae for possible use in mariculture mariculture
marine aquaculture. . Aquaculture 170: 147-159.
Roberts, R. 2000. A review of larval larval
1. pertaining to larvae.
see cutaneous and visceral larva migrans. settlement cues for abalone (Haliotis spp.). 4th International Abalone Symposium. Symposium handbook. Cape Town, South Africa: University of Cape Town. 92 pp.
Roberts, R., T. Kawamura & H. Takami. 2000. Diatoms for abalone culture: a workshop for abalone farmers. Cawthron report No. 547. New Zealand New Zealand (zē`lənd), island country (2005 est. pop. 4,035,000), 104,454 sq mi (270,534 sq km), in the S Pacific Ocean, over 1,000 mi (1,600 km) SE of Australia. The capital is Wellington; the largest city and leading port is Auckland. : Cawthron Institute. 27 pp.
Ryther, J. H., N. Corwin, T. A. Debusk & L. D. Williams. 1982. Nitrogen uptake and storage by red alga red alga
Any of various predominantly marine algae of the division Rhodophyta, characteristically red or reddish in color.
red alga Gracilaria tikvahiae (McLachlan, 1979). Aquaculture 26:107-115.
Sawatpeera, S., E. S. Upatham, M. Kruatrachue, V. Ingsrisawang, T. Singhagraiwan, Y. P. Chitramvog & K. Parkpoomkamol. 1998. Determination of gut contents of thai abalone Haliotis asinina Linnaeus. J. Shellfish Res. 17(3):765-769.
Searcy-Bernal, R., L. A. V61ez-Espino & C. Anguiano-Behran. 2000. Effect of biofilm Biofilm
An adhesive substance, the glycocalyx, and the bacterial community which it envelops at the interface of a liquid and a surface. When a liquid is in contact with an inert surface, any bacteria within the liquid are attracted to the surface and adhere density on grazing rates of Haliotis fulgens postlarvae. 4th International Abalone Symposium. Simposium Handbook. Cape Town, South Africa: University of Cape Town. 92 pp.
Simental-Trinidad, J. A., M. P. Sanchez-Saavedra & J. G. Correa-Reyes. 2001. Biochemical composition of benthic marine diatoms using as culture medium a common agricultural fertilizer. J. Shellfish Res. 20(2):611-617.
Simental, J. A. & M. P. Sanchez-Saavedra. 2003. Effects of agricultural fertilizer on growth rate of three benthic diatoms. Aquacultural Engineering 27:265-272.
Simental-Trinidad, J. A. 2003. Enriquecimiento de laminas de Macrocystis pyrifera con peliculas de Navicula incerta y su utilizacion como alimento para abulon (Huliotis spp.). Ph.D. Thesis Advance. Departamento de Acuicultura, Biotecnologia Marina. Centro de lnvestigacion Cientifica y de Educacion Superior de Ensenada. Ensenada Baja, California, Mexico. 41 pp.
Uki, N. 1981. Food value of marine algae of order Laminariales Noun 1. order Laminariales - in some classifications coextensive with family Laminariaceae: marine brown algae of cold or polar seas
protoctist order - the order of protoctists for growth of the abalone Haliotis discus hannai. Bull. Tohoku Reg. Fish. Lag. 42:19-24.
Voltolina, D. 1985. Biomass evaluation in cultures of benthic diatoms: an experimental review of methodology. Coastal Marine Science Laboratory Internal Manuscript Series 85:4. Victoria, B.C. Canada. 86 pp.
Voltolina, D. 1994. Cultivos de microalgas bent6nicas para alimentacion de juveniles de abulon (Haliotis spp.). In: D. A. Siqueiros-Beltrones, D. Voltolina & A. M. Jaramillo-Legorreta, editors. Topicos selectos sobre microalgas. Serie Cientifica 2 (1): pp. 87-97.
JORGE ARTURO SIMENTAL, MARIA DEL PILAR Pilar
strong-minded female leader of a group of guerrillas in the Spanish Civil War. [Am. Lit.: Hemingway For Whom the Bell Tolls]
See : Female Power
Pilar SANCHEZ-SAAVEDRA, * AND NORBERTO FLORES-ACEVEDO
Laboratorio de Biologia y Cultivo de Microalgas. Departamento de Acuicultura, Centro de lnvestigacion Cientifica y de Educacion Superior de Ensenada. Apdo. Postal 2732, C.P. 22860 Ensenada, Baja California, Mexico.
* Corresponding author. E-mail: email@example.com