This is an example of what a big cat(tiger, cougar, jaguar, lion, ect.) would look like in my Blue Planet RP. It's just an example and none of them have to look like this, but just for the sake of showing what they might look like.

Water Traits:
huge paws for swimming
split tail
large, webbed ears
claws/teeth for catching food
spikes on elbows, ankles(the pointed part of the leg), and jaw for protection
gill-type things on nose instead of nostrils
long legs and small body to move faster(maybe?)

Dedicated to the wonderful omnia1 for helping me come up with the world and being awesome X3

--Sorry, you can sort of see my math homework on the back of it...we had a test and it was the only plain sheet of paper I had left afterwords because I finished my book >.>