Flounder, goldfish and warmouth are all types of fish that have eight letters in their name.
Other fish with 8 letter names are:
Ambylosyllis is one, among very likely quite a few. Among aquatic animals with two-part names would be the Black Dolphin. If the name can be plural, the possibilities increase greatly, and then would include bloodsuckers.
Please see the links below for further research.
A fish that contains thirteen letters in its name is the Butterfly Fish. These fish get there name from their variety in looks and similarity in look to butterflies. They are also notable for having brush like teeth.
beachsalmon, bristlemouth, cardinalfish, footballfish, mosquitofish, mouthbrooder, pineconefish, scorpionfish, squirrelfish, tubeshoulder
Goldfish Is a Silvery fish and it has 8 letters its name.
The lionfish has venomous spines, and has eight letters.
Bottomki
piranhas
Mackerel?
Barbados and Botswana have 8 letters in their name. Colombia and Malaysia have 8 letters in their name.
Flounder.
Herring.
Haddock
carp
Kangaroo has 8 letters
there is a gold fish,beta all fishes have a 1 or 2 letters in it.