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Reproduction in marine pelagic fishes and in freshwater fishes is distinctively different. How and why do they differ?

Freshwater fish almost invariably produce nonbouyant eggs, and generally provide no parental care. Their eggs are laid along the bottom of the water.

In marine fish, males and females come together in great schools and release vast numbers of gametes into the water to drift with currents.

Marine fish eggs are minute, buoyant, and transparent.
Freshwater fish simply scatter their myriads of eggs among weeds or along the bottom. However, some fish such as bullhead catfish and a few darters produce fewer, larger eggs, and therefore their parents do provide care. C.P.

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