According to PetEducation.com (first on the google search list for “nocturnal fish”):
Marine fish can be classified into groups, depending upon when they are most active. “Diurnal” fish are those that are primarily active during the day; those that are most active during the night are called “nocturnal.” Some fish are especially active at dusk and dawn, and are referred to as “crepuscular.” Various marine invertebrate species can also be classified into one of these three groups.
A list of fish that come out at night:
- Big Eyes
- Pinecone fish
- Sea bass and groupers
- Flashlight fish
In my own personal opinion, I wouldn’t necessarily trust PetEducation.com as a reliable source, if say, you are plagiarizing web content for a high school or university-level paper. If you are an elementary student, however, this information is probably pretty good and if you provide some beautiful illustrations or a fish colouring project (as seen below), you just may snag yourself a sweet “A+” or a check mark, I don’t know what they do these days. We used to get stickers.