To catch on hook and line? Blacknose shark, Carcharhinus acronotus will beat you like you owe him money and try de skin you with the tail and take a chunk out of you with the pointy end.
In a tank... I haven't much experience with the huge cichlids thus my scale is skewed. Of species I've kept the mated pair convicts was the most tenacious against the other fish.
In a tank... I haven't much experience with the huge cichlids thus my scale is skewed. Of species I've kept the mated pair convicts was the most tenacious against the other fish.