By contrast fish are designed entirely differently. In the case of the grey nurse shark their criminal behaviours begin during pregnancy where there are approximately 20 shark pups in each uterus, the fastest developing pups eat all the other pups until there is only one pup left in each uterus - that's fratricide.

They will eat each other just for the hell of it - that's homicide and cannibalism.

Also they never stop growing, meaning that if you created a robotic shark it would continue to eat and grow until it takes over the universe, unless you kill it first.

So by eating fish you are saving the universe.

./\ /\
>°.°<
.''" "''