DFG DEBUNKS SPAWNING MYTH.Byline: Bill Becher Special to the Daily News Fishing for spawning bass is not a problem, says the DFG DFG Deutsche Forschungsgemeinschaft (German Research Council) DFG Department of Fish and Game DFG District Factor Group DFG Data Flow Graph DFG Difference Frequency Generation DFG Diode Function Generator DFG Dog Faced Gremlin . Some anglers are concerned about negative impacts of fishing for spawning bass. Many years ago, bass-fishing regulations included closed seasons during the winter and early spring. ``It was assumed that black bass were especially vulnerable during the winter and spring and needed protection during spawning,'' said Dennis P. Lee, senior fisheries biologist for the California Department of Fish and Game. ``Many anglers still believe that protecting spawning bass will increase the number of bass.'' Research suggests that the anglers' perception is wrong. The size and number of bass is impacted by events that occur after egg laying rather than the quantity of eggs laid or nests constructed. Predation predation Form of food getting in which one animal, the predator, eats an animal of another species, the prey, immediately after killing it or, in some cases, while it is still alive. Most predators are generalists; they eat a variety of prey species. , food supply, disease, parasitism parasitism: see parasite. parasitism Relationship between two species in which one benefits at the expense of the other. Ectoparasites live on the body surface of the host; endoparasites live in their hosts' organs, tissues, or cells and often rely and other variations in the environment are what determine the number and size of fish. Low dissolved oxygen, temperature fluctuation, water-surface elevations and reservoir fluctuation, turbidity turbidity /tur·bid·i·ty/ (ter-bid´i-te) cloudiness; disturbance of solids (sediment) in a solution, so that it is not clear.tur´bid Turbidity The cloudiness or lack of transparency of a solution. and wave action all impact bass fisheries. ``More recent studies using DNA analysis DNA analysis Any technique used to analyze genes and DNA. See Chromosome walking, DNA fingerprinting, Footprinting, In situ hybridization, Jeffries' probe, Jumping libraries, PCR, RFLP analysis, Southern blot hybridization. of parent and progeny PROGENY - 1961. Report generator for UNIVAX SS90. suggests that only a few successful nests are needed to provide enough juvenile fish to maintain a population of bass in a cove or embayment,'' Lee said. ``Protecting bass from harvest during spawning is not likely to increase the number of fish produced that year.'' Asked about a parent fish returning to a nest site if the nest is removed, Lee said that observations by fishery biologists have shown that some bass will return to a nest site to continue spawning or nest tending. But bass do not have a homing instinct and will not return to a nest site if released far away. Removing a male fish while it is guarding the nest increases the chance that predators will eat the eggs or fry. ``Nonetheless, black bass populations continue to exist and in many waters Many Waters is a 1986 novel by Madeleine L'Engle, part of the author's Time Quartet. "Many waters cannot quench love, neither can the floods drown it. If a man were to give all his wealth for love, it would be utterly scorned. fisheries improve,'' Lee said. ``The California Department of Fish and Game has managed black bass fisheries with year-round open seasons and daily possession limits for more than 50 years.'' |
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