In science and fishing, it is important to know the difference between one animal and another. This can be challenging – especially when animals look alike. Some fishes look a lot like other fishes because they have similar body parts. If someone comes across a fish they do not recognize, looking at the different location of body parts, and their shapes can help in identifying a fish species.

Two goldfish are a pair of fish. A goldfish and a trout, are two fishes. If you are speaking about different kinds of fishes, we add the plural es.