You would probably need to have a photograph of the fish. Check out a few reference books in your local library. Maybe contact the Marine Biology department of your local or nearest University.
Yes. Sardines are a salt water species.
theres a salt water group and a fresh water group of fish
These spectacular fish (Pseudanthias species) are tropical marine (salt water) fish.
There are many different catfish species, salt water and fresh water.
Its a cold water salt water fish which has very oily flesh
There are fish that are commonly called "Bream" in both fresh and salt water.
No. Axolotles are a fresh water species.
Both fresh and salt water, depending on the species
Channel catfish (Ictalurus punctatus) is a freshwater species.
This link lists the most common fresh water aquarium fish (excludes salt water fish), there are hundreds.
Yes, and at various levels, depending on the species in question.
If you mean flounder, no. They are salt water species.