A detective in training is called to a room on his first day in, once there his instructor greets him and tells him he has a deck of fish cards. Alongside the instructor are two men who hold three cards from the same deck. He was given a paper reexplaining the prompt which had written on top: 'Each man will say what he has, yet one man is lying... This man is the murderer.' The first man began, he stated he held a shark, a shrimp, and a catfish. The second man stated he held two goldfish and a lion. Who is the murderer? -Riddles