Definitions

1. noun

a fish that is often caught accidentally in fishing nets, especially a young trevally or a juvenile pompano

“The rudderfish are an important part of the marine ecosystem, serving as both predator and prey.”

2. noun

any of various other fishes, such as the rudderfish or the pompano, that are caught accidentally in fishing nets

“The fishermen were surprised to catch a large rudderfish in their net, as they were targeting cod.”