The following is the complete list of fish, their location, times to catch them, and the selling prices.

freshcookies.
Angelfish: 3,000 Bells; river (rare) May to October, morning, evening, night.
Arapaima: 10,000 Bells; river (rare) July to September, morning, evening, night.
Arowana: 10,000 Bells; river (rare) June to September, morning, evening, night.
Barbel Steed: 200 Bells; river all year, all day.
Barred Knifejaw: 5,000 Bells; ocean (rare) March to November, all day.
Bitterling: 900 Bells; river November to February, all day.
Black Bass: 300 Bells; river all year, all day.
Blue Gill: 120 Bells; river all year, noon.
Blue Marlin: 10,000 Bells; ocean (rare) July to Sept, all day.
Carp: 300 Bells; river all year, all day.
Cat Fish: 800 Bells; pond May to October, morning, evening, night.
Char: 3,800 Bells; waterfall Mar to June and September to November, morning, evening.
Cherry Salmon: 1,000 Bells; river March to June and September to November, morning, evening.
Clownfish: 650 Bells; ocean April to September, all day and May to August, noon.
Coelacanth: 15,000 Bells; ocean during rain or snow (rare) all year, morning , evening, night.
Craw Fish: 250 Bells; holding pond April to Sept, all day.
Crucian Carp: 120 Bells; river all year, all day.
Dab: 300 Bells; ocean October to April, all day.
Dace: 200 Bells; river all year, morning, evening, night.
Dorado: 15,000 Bells; river (rare) June to September, morning, noon, evening.
Eel: 2,000 Bells; river June to Sept, morning, evening, night.
Football Fish: 2,500 Bells; ocean (rare) November to March, morning, evening, night.
Freshwater Goby: 300 Bells; river (rare) all year, morning, evening, night.
Frog: 120 Bells; holding pond May to August, all day.
Gar: 6,000 Bells; pond (rare) June to September, morning, evening, night.
Giant Snakehead: 5,500 Bells; pond July to August, noon.
Gold Fish: 1,300 Bells; river (rare) all year, all day.
Guppy: 1,300 Bells; river (rare) April to November, noon.
Hammerhead Shark: 8,000 Bells; ocean (rare) June to September, all day.
Horse Mackeral: 150 Bells; ocean all year, all day.
Jelly Fish: 100 Bells; ocean August, all day.
Killifish: 300 Bells; holding pond (rare) April to August, all day.
King Salmon: 1,800 Bells; river (rare) September, all day.
Koi: 2,000 Bells; river (rare) all year, morning, evening, night.
Loach: 300 Bells; river March to May, all day.
Ocean Sunfish: 4,000 Bells; ocean (rare) April to September, morning noon, evening.
Octopus: 500 Bells; Ocean September to January and March to July, all day.
Olive Flounder: 800 Bells; Ocean (rare) all year, all day.
Pale Chub: 200 Bells; river all year, noon.
Piranha: 2,500 Bells; river (rare) June to September, noon, night.
Pond Smelt: 300 Bells; pond December to February, all day.
Popeyed Goldfish: 1,300 Bells; river (rare) all year, all day.
Puffer Fish: 240 Bells; ocean July to September, all day and August, all day.
Rainbow Trout: 800 Bells; river March to June and September to November, morning, evening.
Red Snapper: 3,000 Bells; ocean all year, all day.
Salmon: 700 Bells; river September, all day.
Sea Bass: 160 Bells; ocean all year, all day.
Sea Butterfly: 1,000 Bells; ocean December to February, all day.
Seahorse: 1,100 Bells; ocean April to November, all day and May to September, noon.
Shark: 15,000 Bells; ocean (rare) June to September, morning, evening, night.
Squid: 400 Bells; Ocean December to Aug, all day.
Stringfish: 15,000 Bells; river (rare) December to February, morning, evening, night.
Sweetfish: 900 Bells; river July to September, all day.
Tuna: 7,000 Bells; ocean (rare) November to March, all day.
Yellow Perch: 240 Bells; river October to March or November to February, all day.
Zebra Turkey Fish: 400 Bells; ocean April to November, all day and May to September, noon.

*** Most items are available in Tom Nook's store or Redd's tent.

Western theme
Western Fence, Storefront, Cow Skull, Tumbleweed, Saddle Fence,
Wagon Wheel, Watering Trough, Well, Desert Cactus, Covered Wagon.
Wallpaper: Western Vista
Flooring: Western Desert
Boxing theme
Ringside Table, Boxing Barricade, Judge's Bell, Weight Bench, Red
Corner, Blue Corner, 2 Neutral Corners, Boxing Mat, Speed Bag,
Sandbag
Wallpaper: Ringside Seating
Flooring: Boxing Ring Mat.
Construction theme
Iron Frame, Wet Roadway Sign, Orange Cone, Traffic Cone, Striped
Cone, Jackhammer, Saw Horse, Detour Arrow, Handcart, Manhole
Cover, Cement Mixer, Steam Roller
Wallpaper: Blue Tarp
Flooring: Closed Road
Space theme
Flying Saucer, Lunar Rover, Asteroid, Satellite, Space Station,
Moon, Rocket, Lunar Lander, Spaceman Sam, Space Shuttle
Wallpaper: Lunar Horizon
Flooring: Lunar Surface
Mad Scientist theme
Medicine Chest, Lab Chair, Amazing Machine, Complex Machine, Lab
Bench, Florence Flask, Unknown Machine
Wallpaper: Lab Wall
Flooring: Lab Floor
Pirate theme
Helm, Ship Compass, Barrel, Anchor, Keg, Ship Cannon
Wallpaper: Sea View
Flooring: Ship Deck
*** Available only through Pascal.
Mossy Garden theme
Bird Feeder, Bug Zapper, Picnic Table, Birdhouse, Hammock, Tiki
Torch, Backyard Pool, Barbecue, Lawn Chair, Mr. and Mrs. Flamingo,
Sprinkler, Garden Gnome, Lawn Mower, Bird Bath
Wallpaper: Backyard Fence
Flooring: Backyard Lawn
Nursery theme
Rocking Horse, Cradle, Wobbelina, Elephant Slide, Baby Bed, Dolly,
Train Set, Clackercart, Merry-Go-Round, Stroller
Wallpaper: Playroom Wall
Flooring Playroom Rug