Now we're not experts on aquatic life and can't confirm to you if that is really some mutant form of the clarius batrachus (walking catfish) as suggested (where are the whiskers?), but some netizens have already raised doubts saying this is a whale shark instead.
Now you decide for yourself: Does it look more like the walking catfish or the whale shark?
And if it is the whale shark, which is "vulnerable to extinction" according to Wikipedia, why did they kill it? Well, perhaps because they thought it killed a bunch of people.
But how did they find it, and catch it, and why did they kill it and chop it up in such a public manner, we wonder?
We bet scientists would have liked to see this alive first (we imagine saltwater whale sharks don't pop up in freshwater reservoirs too often ... nor, we guess, do 30cm catfish regularly turn into three-meter mutants).