Animal rights groups often make the argument that animals are (in a moral sense) equal to humans. Therefore, logically, humans are equal to animals. Animals eat other animals (including in some cases ones which are more intelligent than themselves). PETA do not object to this. If humans are on equal moral terms with animals, then logically there is no moral argument against eating meat or fish, unless you want to stop animals eating other animals as well. Anyway, that's my view. Same goes for fishing and hunting (unless the species is endangered).
BTW, the argument against this is that animals have to eat other animals and humans don't. In fact, there are many animals which eat meat although they don't have to (eg chimps), and some (eg foxes) which kill other animals without eating them afterwards.
Fish are intelligent animals. But not in the same way that monkeys are. They are also delicious (i don't know if monkeys are). The problem is that people tend to see animal 'intelligence' in human terms and ascribe human emotions to it. Fish can certainly feel pain, but can they experience suffering as a result? Personally, I think its cruel to keep, say, a 12inch oscar in a 20gallon tank, because it denies the fish natural behaviour. But I don't think it suffers in anything like the same way as an imprisoned human would.
Sorry to go off on one, but I love discussing this kind of thing.
