Some morphometric relationships of coral trouts Plectropomus pessuliferus and Plectropomus areolatus inhabiting Sudanese Red Sea.
Sudan marine finfish fisheries account for about 9 percent of the total fish potential of the country and contributes 8.5 percent of total production (FAO, 2008). Coral trouts (Plectropomus pessuliferus "Najil" and Plectropomus areolatus "Silimani" ) are the main target species for artisanal fishers in Sudanese marine fisheries. Coral trouts of the genus Plectropomus are members of the serranid subfamily Epinephelinae, which are commonly known as groupers . Sea basses (Serranidae) are among the most important families of commercially harvested tropical marine fishes worldwide. Most members of the Epinephelinae subfamily, in particular, are heavily exploited and bring high market prices [2,14] c.f. .
Size- free meristics and morphometric characters are valid tools to identify species, genera and fish stock units . Morphometric characters are not sensitive to short-term, local fluctuations, and reflect average differences over long periods between environmental factors in different areas . Many statistical techniques used the morphometric and meristic characters in classification and discrimination study, e.g., Ismen, , LAWSON, , Simon et al,  and Mekkawy and Mohammed, .
The morphometric measurements can help in identification of P. pessuliferus and P. areolatus in Sudanese Red Sea and also may facilitate the determination of the locality from where specimens of the same species came from (in which this species inhabits).
Materials and Methods
A total of 165 specimens of P. pessuliferus and 262 specimens of P. areolatus were collected during the period from August 2009 to August 2010 from Port Sudan fish market. The specimens were believed to be caught south of Port Sudan about 60 km (around Suakin). On the average, around 10-20 specimens for each species belonging to the same area were collected monthly.
Morphometric measurements followed the description by FAO,  (fig. 1). The Total length (TL), standard length (SL), depth (D), girth (G), were measured with tape to the nearest 0.1cm and head length (HL), eye diameter (ED), snout, pectoral fin length (PFL), pelvic fin length (PVFL), caudal peduncle depth (CPD), length of upper jaw (LUJ), open mouth width (OMW) were measured with Vernier to the nearest 0.01cm. Some proportions are adopted from the study e.g. (D: SL, HL: SL, Snout: HL, and PFL: HL).
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The relationships were plotted by Excel 2007 and the variables analyzed by SPSS 17.
Results and Discussion
All morphometric characters varied between two species. Descriptive statistics for each measurement character are given in Table 1. There was high significant differences between the two species in all morphometric characters (P< 0.000). For P. pessuliferus and P. areolatus the relationships between total length and others variables are very strong (P < 0.01), the regression analysis between different morphometric character and total length was calculated (Table 2and figs. 2-12). The correlation coefficient value (R-value) showed that high significant at (P< 0.01). Some body proportions are adopted from study (Table 3). The proportions showed that they are significant differences between the two species.
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Analysis of the morphometric characters are important for the identification of any fish species [3,4,9,13]. C.f. . Meristic and morphometric features were used since they are still dependable tools to characterize fish species especially on the field and they are sensitive to any environmental changes . C.f. (Omoniyi and Agbon, 2008). All morphometric characters of P. pessuliferus are larger than those of P. areolatus (Table 1). In the present study all relationships of morphogenetic measurements against the total length appeared that there is a strong correlation (Table 2). The morphogenetic measurements for the P. pessuliferus and P. areolatus around Suakin showed that these species significantly different. The patterns of differences in the morphogenetic characters between these species may be considered in term of their mode of growth, this found by Mekkawy and Mohammed,  who studied the morphometric and meristics of the three epinepheline species: (Cephalopholis argus, Cephalopholis miniata and Vriola louti) from Red Sea. Some body proportions are adopted from the study (Table 3), showed that all propositions means are compatible with FAO,  Records, except for HL: Snout which equals 4.07 and is larger than FAO, (1993) which is maximum value is 3.60. The correlations of these indices with TL and SL showed significant correlation at 0.01 level. Except for the index of HL: PLF, which showed no significance, all indices for P. pessuliferus and P. areolatus are vary significantly.
All Morphometric measurements have high correlation with total length. There are significant differences in the morphometric measurements and body proportions between P. pessuliferus and P. areolatus around Suakin. Majority of body proportions for the two species conforms with FAO,  Identifications, except for HL: Snout. These variations between these two species are important and critical criteria for any fisheries management endeavor for P. pessuliferus and P. areolatus in Sudanese Red Sea.
Author acknowledges Red Sea University, UMT, also I gratefully acknowledge assistance in samples measurements by, O. Mogera, M. Mostafa, N. Hassan, I. Mokhtar, N. Mohamed, H. Ezeddin, H.Omer and E. Majdi.
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(1) S.M. Elamin, (1) M.A. Ambak, (2) M.A. Samoilys and (3) M.E. Hamza
(1) Faculty of Agrotechnology and Food Science, UMT, Kuala Terengganu, Malaysia.
(2) Coastal Oceans Research and Development--Indian Ocean (CORDIO), Mombasa, Kenya.
(3) Faculty of Marine Science and Fisheries, Red Sea University, Port Sudan, Sudan.
S.M. Elamin, Faculty of Agrotechnology and Food Science, UMT, Kuala Terengganu, Malaysia
Table 1: Descriptive Statistics of different body measurements for P. pessuliferus and P.areolatus around Suakin. Morphometric P. pessuliferus Character Min-Max MeaniSE T.L 32.60-90.00 56.90 [+ or -] 0.94 S.L 26.70-75.00 46.29 [+ or -] 0.79 H.L 8.92-28.00 16.25 [+ or -] 0.30 E.D 1.35-2.97 2.04 [+ or -] 0.02 D 9.00-28.50 16.62 [+ or -] 0.34 G 19.00-61.00 34.13 [+ or -] 0.68 Snout 2.30-9.00 4.78 [+ or -] 0.10 PFL 4.30-11.24 7.15 [+ or -] 0.12 PVFL 3.92-10.10 6.49 [+ or -] 0.11 CPD 2.98-9.00 5.16 [+ or -] 0.09 LUJ 3.92-12.50 7.27 [+ or -] 0.14 OMW 3.44-11.00 6.34 [+ or -] 0.10 Morphometric P. areolatus Character Min-Max MeaniSE T.L 24.5-57.6 38.77 [+ or -] 0.43 S.L 20.2-48.5 32.11 [+ or -] 0.36 H.L 6.84-17.65 11.11 [+ or -] 0.13 E.D 1.12-2.17 1.63 [+ or -] 0.01 D 6.1-18.2 10.84 [+ or -] 0.14 G 13.7-36.0 22.45 [+ or -] 0.27 Snout 1.51-4.60 2.76 [+ or -] 0.04 PFL 2.98-8.11 5.16 [+ or -] 0.06 PVFL 2.87-6.51 4.48 [+ or -] 0.05 CPD 2.08-5.73 3.83 [+ or -] 0.04 LUJ 3.00-8.33 5.11 [+ or -] 0.07 OMW 2.83-6.43 4.65 [+ or -] 0.05 Table 2: Regression analysis between the different body measurements for P. pessuliferus and P.areolatus around Suakin. Correlates Species a-value [+ or -] SE TL Vs SL P. pessuliferus 0.729 [+ or -] 0.012 P. areolatus 0.788 [+ or -] 0.017 TL Vs HL P. pessuliferus 0.194 [+ or -] 0.007 P. areolatus 0.224 [+ or -] 0.008 TL Vs E.D P. pessuliferus 0.179 [+ or -] 0.020 P. areolatus 0.195 [+ or -] 0.016 TL Vs D P. pessuliferus 0.135 [+ or -] 0.010 P. areolatus 0.185 [+ or -] 0.013 TL Vs G P. pessuliferus 0.312 [+ or -] 0.021 P. areolatus 0.483 [+ or -] 0.025 TL Vs Snout P. pessuliferus 0.033 [+ or -] 0.002 P. areolatus 0.032 [+ or -] 0.003 TL Vs PFL P. pessuliferus 0.138 [+ or -] 0.009 P. areolatus 0.118 [+ or -] 0.009 TL Vs PVFL P. pessuliferus 0.137 [+ or -] 0.009 P. areolatus 0.174 [+ or -] 0.011 TL Vs CPD P. pessuliferus 0.080 [+ or -] 0.007 P. areolatus 0.127 [+ or -] 0.010 TL Vs LUJ P. pessuliferus 0.075 [+ or -] 0.003 P. areolatus 0.072 [+ or -] 0.004 TL Vs OMW P. pessuliferus 0.179 [+ or -] 0.023 P. areolatus 0.240 [+ or -] 0.030 Correlates Species b- value [+ or -] SE TL Vs SL P. pessuliferus 1.027 [+ or -] 0.004 P. areolatus 1.014 [+ or -] 0.006 TL Vs HL P. pessuliferus 1.095 [+ or -] 0.010 P. areolatus 1.067 [+ or -] 0.010 TL Vs E.D P. pessuliferus 0.603 [+ or -] 0.027 P. areolatus 0.582 [+ or -] 0.022 TL Vs D P. pessuliferus 1.189 [+ or -] 0.019 P. areolatus 1.112 [+ or -] 0.019 TL Vs G P. pessuliferus 1.160 [+ or -] 0.016 P. areolatus 1.049 [+ or -] 0.014 TL Vs Snout P. pessuliferus 1.231 [+ or -] 0.018 P. areolatus 1.216 [+ or -] 0.022 TL Vs PFL P. pessuliferus 0.976 [+ or -] 0.016 P. areolatus 1.032 [+ or -] 0.020 TL Vs PVFL P. pessuliferus 0.954 [+ or -] 0.017 P. areolatus 0.889 [+ or -] 0.017 TL Vs CPD P. pessuliferus 1.031 [+ or -] 0.021 P. areolatus 0.931 [+ or -] 0.022 TL Vs LUJ P. pessuliferus 1.130 [+ or -] 0.009 P. areolatus 1.166 [+ or -] 0.013 TL Vs OMW P. pessuliferus 0.882 [+ or -] 0.032 P. areolatus 0.810 [+ or -] 0.034 [R.sup.2]- Correlates Species R-value value TL Vs SL P. pessuliferus 0.999 ** 0.997 P. areolatus 0.995 ** 0.991 TL Vs HL P. pessuliferus 0.994 ** 0.988 P. areolatus 0.988 ** 0.976 TL Vs E.D P. pessuliferus 0.864 ** 0.747 P. areolatus 0.855 ** 0.731 TL Vs D P. pessuliferus 0.980 ** 0.960 P. areolatus 0.966 ** 0.932 TL Vs G P. pessuliferus 0.984 ** 0.969 P. areolatus 0.977 ** 0.954 TL Vs Snout P. pessuliferus 0.984 ** 0.968 P. areolatus 0.960 ** 0.921 TL Vs PFL P. pessuliferus 0.979 ** 0.958 P. areolatus 0.954 ** 0.909 TL Vs PVFL P. pessuliferus 0.976 ** 0.953 P. areolatus 0.954 ** 0.909 TL Vs CPD P. pessuliferus 0.969 ** 0.939 P. areolatus 0.935 ** 0.875 TL Vs LUJ P. pessuliferus 0.995 ** 0.989 P. areolatus 0.983 ** 0.967 TL Vs OMW P. pessuliferus 0.909 ** 0.826 P. areolatus 0.826 ** 0.683 ** Correlation is significant at the 0.01 level (2-tailed). Table 3: Descriptive Statistics of different body proportions for P. pessuliferus and P.areolatus around Suakin. Body proportion Species Present study Min-Max MeaniSE SL: D P. pessuliferus 2.31-3.50 2.81 [+ or -] 0.01 P. areolatus 2.50-3.41 2.98 [+ or -] 0.01 S.L: HL P. pessuliferus 2.63-3.17 2.86 [+ or -] 0.01 P. areolatus 2.49-3.20 2.90 [+ or -] 0.01 H.L: Snout P. pessuliferus 3.00-4.33 3.42 [+ or -] 0.01 P. areolatus 2.90-4.79 4.07 [+ or -] 0.02 HL: PFL P. pessuliferus 1.87-2.67 2.26 [+ or -] 0.01 P. areolatus 1.89-2.91 2.16 [+ or -] 0.01 Body proportion Species FAO (1993) Min-Max Mean SL: D P. pessuliferus 2.90-3.90 3.40 P. areolatus 2.90-3.90 3.40 S.L: HL P. pessuliferus 2.70-3.10 2.90 P. areolatus 2.70-3.10 2.90 H.L: Snout P. pessuliferus 2.80-3.60 3.20 P. areolatus 2.80-3.60 3.20 HL: PFL P. pessuliferus 1.90-2.30 2.10 P. areolatus 1.90-2.30 2.20
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|Title Annotation:||Original Article|
|Author:||Elamin, S.M.; Ambak, M.A.; Samoilys, M.A.; Hamza, M.E.|
|Publication:||Advances in Environmental Biology|
|Date:||Aug 1, 2011|
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