They are physically ten times as strong as normal humans from birth and this difference is magnified underwater, where a human's power is cut in half, while fish-men not only are completely unhindered, but are even strengthened.

Is Jimbei the strongest Fishman?

The number of times he saved Luffy, and other Straw Hats, is simply uncountable by now. Jinbe is easily one of the strongest Fishmen to be introduced to the story. He was able to tank Sakazuki's magma punch, and actually not be incapacitated-- an achievement that can not be overlooked.

Is Jimbei stronger than arlong?

9 Can Defeat: Arlong

While he did give Luffy quite a battle at the beginning, he'd pale in comparison to Jinbe's strength and legacy within the grander world. This is best encapsulated with their initial bounties, where Jinbe's was more than twelve times Arlong's.