Ant
Your one and only pest!
Question for you - how is this possible?
All animals can't be herbivorous.
Not a question of importants, or moral rights to live, which are 100% human ideas and 100% not applicable to nature.
Now, granted, neps don't eat fish in the wild, but so what? OTHER things eat fish, and what difference does it make who or what does the eating? Is it ok for ME to eat a fish, but not, say, a desset animal?
It means that a fish wouldn't be digested alive in a very small amount of water without enough oxegen to breath properly. Also it isn't wrong to EAT the fish, it is wrong to torture a fish efore it dies in a way that would never happen without human interaction.