The following fish can be sold for the listed amount of Bells.

Anglefish: 3,000 Bells (rare)
Arapaima: 10,000 Bells (rare)
Arowana: 10,000 Bells (rare)
Barbel Steed: 200 Bells
Barred Knifejaw: 5,000 Bells
Bitterling: 900 Bells
Black Bass: 300 Bells
Blue Marlin: 10,000 Bells (rare)
Bluegill: 120 Bells
Butterflyfish: 1,000 Bells
Carp: 300 Bells
Catfish: 800 Bells
Char: 3,800 Bells
Cherry Salmon: 1,000 Bells
Clownfish: 650 Bells
Coelacanth: 15,000 Bells (rare)
Crawfish: 250 Bells
Crucian Carp: 120 Bells
Dab: 300 Bells
Dace: 200 Bells
Dorado: 15,000 Bells (rare)
Eel: 2,000 Bells
Football Fish: 2,500 Bells (rare)
Freshwater Goby: 300 Bells (rare)
Frog: 120 Bells
Gar: 6,000 Bells (rare)
Giant Snakehead: 5,500 Bells
Goldfish: 1,300 Bells (rare)
Guppy: 1,300 Bells (rare)
Hammerhead Shark: 8,000 Bells (rare)
Horse Mackerel: 150 Bells
Jellyfish: 100 Bells
Killifish: 300 Bells (rare)
King Salmon: 1,800 Bells
Koi: 2,000 Bells (rare)
Loach: 300 Bells
Lobster: 2,500 Bells
Moray Eel: 2,000 Bells
Napoleonfish: 10,000 Bells
Neon Tetra: 500 Bells
Octopus: 500 Bells
Olive Flounder: 800 Bells (rare)
Pale Chub: 200 Bells
Pike: 1,800 Bells
Piranha: 2,500 Bells (rare)
Pond Smelt: 300 Bells
Popeyed Goldfish: 1,300 Bells (rare)
Puffer Fish: 240 Bells
Rainbow Trout: 800 Bells
Ray: 3,000 Bells
Red Snapper: 3,000 Bells
Salmon: 700 Bells
Sea Bass: 160 Bells
Sea Butterfly: 1,000 Bells
Sea Horse: 1,100 Bells
Sea Sunfish: 4,000 Bells (rare)
Shark: 15,000 Bells (rare)
Squid: 400 Bells
Stringfish: 15,000 Bells (rare)
Surgeonfish: 1,000 Bells
Sweetfish: 900 Bells
Tuna: 7,000 Bells (rare)
Yellow Perch: 240 Bells
Zebra Turkeyfish: 400 Bells