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They may have had an important function in the past.
Usually fish is both singular or plural. Look at the fish. How many fish are in the pond?But, to complicate things, fishes is sometimes used. Ichthyologists may refer to different species as fishes. But I would stick to fish.
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Robbing the Fishes - 1916 was released on: USA: 17 May 1916
vestigial organ is for example"appendix"in human beings.another example is the"tail bone"in human beings.
gills
I believe you mean the fishes mucoprotective slime coat. It is there to protect the fish from things (bugs/chemicals/etc etc) in the water that may damage it.
They may have had an important function in the past.
A vestigial structure is part of an organism's anatomy that functioned in an ancestral species, but which is no longer present in the same size and does not serve the same purpose. In some instances, it is completely redundant. Examples of vestigial structures are the tailbone of a koala and the leg bone in a baleen whale. The appendix in a human being is often thought to be a vestigial structure, but recent research indicates the appendix may still perform a very useful purpose in the immune system.
no mostly big fishes are found in seas only small fishes present in dams.
If you're asking about fishes, the offspring may be uncountable.
As fishes feed on plankton,fishes may starve due to decrese in population of planktons.