Spirit Dave, on 17 January 2013 - 18:14, said:
Yay, catch it and then needlessly put it on a wall. Let's take a life for zero reason! Douchebag.
You know one main reason one may actually do this is because this is not the natural ecosystem of the fish and its presence there (through human dumping) endangers the rest of the fish population.
When they are that size they become aggressive towards other fish.
I had one that was 1/2 that size and it ate the rest of the fish(20 different other fish that were in the tank
) plus took a big size chunk out of the plastic ship that was in the tank with him.
That fish probably started feeding on the other fish and before you know it there are no perch or other fish in that pond. They have even been known to attack the scavengers such as pike and gar fish that keep ponds clean.
If you don't believe me about things taking over just look at Florida and the Anaconda population... it has almost completely taken over the everglades. Which also eats other snakes as well as some protected bird life. Which the normal Snake population does not get big enough to eat the whole adult bird. They have been known to eat Flamingo's which the rest of the snakes can only go after the eggs or the young.
Another example is the Snakehead fish which have become super aggressive and have even gotten rid of turtle populations in ponds as well.
Those fish started out in people's Specialty tanks but people release them as they get too big and now they have overrun the normal fish population. These fish can co-exist with Parana.
Florida wildlife service States that if these fish are f caught - DO NOT re-release back into the population. Instead kill on sight.
That is another reason that Goldfish in Koi ponds are usually the same size. (if the fish are smaller than the bigger one dominates it.)
Before you know it there won't be any more Perch (or bass) in that pond only Goldfish. (that even eat their own young).