Pelagic fish freshwater

Canada s Wild Fisheries: Facts

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Abstract

Systematic comparisons of the ecology between functionally similar fish species from freshwater and marine aquatic systems are surprisingly rare. Here, we discuss commonalities and differences in evolutionary history, population genetics, reproduction and life history, ecological interactions, behavioural ecology and physiological ecology of temperate and Arctic freshwater coregonids (vendace and ciscoes, Coregonus spp.) and marine clupeids (herring, Clupea harengus, and sprat, Sprattus sprattus). We further elucidate potential effects of climate warming on these groups of fish based on the ecological features of coregonids and clupeids documented in the previous parts of the review. These freshwater and marine fishes share a surprisingly high number of similarities. Both groups are relatively short-lived, pelagic planktivorous fishes. The genetic differentiation of local populations is weak and seems to be in part correlated to an astonishing variability of spawning times. The discrete thermal window of each species influences habitat use, diel vertical migrations and supposedly also life history variations. Complex life cycles and preference for cool or cold water make all species vulnerable to the effects of global warming. It is suggested that future research on the functional interdependence between spawning time, life history characteristics, thermal windows and genetic differentiation may profit from a systematic comparison of the patterns found in either coregonids or clupeids.


Pelagic Publishing Ltd Amphibian Biology, Volume 11 Part 3: Status of Conservation and Decline of Amphibians: Eastern Hemisphere: Western Europe
Book (Pelagic Publishing Ltd)

It's an issue with most freshwater fish if you

2008-01-21 12:10:09 by compare_them_with

Ocean fish...even predatory FW fish eat other stuff that bottom feeds and they pick up that flavor, while pelagic predatory fish like tuna eat other smaller fish and crustaceans that feed on krill and plankton.
Part of the issue with tilapia is that unlike other fish they tolerate extreme conditions of poor water quality...they are so tough they can live in fresh OR saltwater and anything in between...so it's easier for people who don't care about water quality to actually get them to market, where other fish would just die from neglect....but when raised properly they are pretty mild and aren't any muddier tasting than other FW fish that live in still waters.


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