@Logicfest -- I am not sure why it is a surprise that an ichthyologist would be in close contact with fishermen. Quite often, you will find that hunters and fishermen do a lot in the way of wildlife conservation.
Duck hunters are known for being interested in wetland preservation. Hunters love to see forests preserved. Fishermen want to make sure fish, rivers and lakes all stay healthy.
Hunters and fishermen have a vested interest in environmentalism. They want plenty of animals and fish running around healthy so they can be hunted or caught.