Heres a few that come to my warped and lost mind....
Check Midwest Models and look at their Lobster Boat at Model Expo or Tower. Also, Lindberg and LifeLike made a series of fishing boats that are abundant on ebay. Graupner and Billings Boats make the African Queen type steam launches, tugs, and various diesel utility boats and you can see these at Hobby-Lobby and Tower Hobbies. Also, it's out of production, but look for the Dumas "Lumba Lumba" African river ferry. This boat is a type that was used to take oil workers into the African interior.
Scott