Shark only has one line, but it's the primary one in the animation. He's a quiet type and pessimistic with a dark, or miserable outlook on life a lot of the time. Here he's giving his line in a "gloomy" or "dark" manner, as though he's raining on Splash's parade. This is also simple, I'll likely pick the best audition for the short and let you know, and I will credit you by the name you want to go by in the end, as well as a link to your site/platform if you want!

Be sure to record the line twice!!