There are ten species of Ocean Fish separated into two categories: Small Ocean Fish and Medium Ocean Fish. All Ocean fish can be eaten raw to restore 12.5 and 1 . They spoil after 1 day in the inventory, leaving one Spoiled Fish. This can be prevented with the Tin Fishin' Bin.
Small Ocean Fish can be murdered to obtain one Fish Morsel, and can be cooked for one Cooked Fish Morsel. The only exception is the Popperfish, which drops Popcorn in both cases.
Gathering
Ocean Fish gather in Shoals, moving around in the Ocean. They can be fished by using a Sea Fishing Rod. Each species of Fish are attracted by different types of Lures depending on their diet.
Runty Guppy are uncommon in Ocean Costal and Ocean Swell.
They eat all type of Food floating in the water, and weight between 48.34 and 60.30. When fishing they put up an initial struggle and then very easy, slow, moves towards the player when tired, pretty much a free catch.
Needlenosed Squirt are common in Costal Ocean. They eat all type of Food floating in the water, and weight between 37.54 and 57.62. When fishing they are fast, darting, with lots of short bursts.
Bitty Baitfish are rare in Costal Ocean, Swzll Ocean, and Rough Ocean. They eat Meats floating in the water, and weight between 39.66 and 63.58. When fishing they do long bursts, with low stamina drain.
Smolt Fry are very common in Costal Ocean. They eat all type of Food floating in the water, and weight between 39.70 and 56.26. They are quick and easy catch.
Mudfish are common in Swell Ocean, uncommon in Costal Ocean. They eat all type of Food floating in the water, and weight between 154.32 and 214.97. They are easy-medium catch.
Deep Bass are common in Swell Ocean, uncommon in Rough Ocean. They eat Meats floating in the water, and weight between 172.41 and 228.88. They are not a hard catch, doesn't like to fight, runs towards the fisher trying to unhook itself with line slack, a fun fight while on a boat with one sail active.
Dandy Lionfish are very common in Hazardous Ocean, uncommon in Rough Ocean. They eat Meats floating in the water, and weight between 246.77 and 302.32. They are hard catch, with short tired times and a high run speed
Black Catfish are common in Rough Ocean, uncommon in Swell Ocean. They eat all type of Food floating in the water, and weight between 193.27 and 278.50. When fishing they do long slow pulls, totally not worth fishing, unless the player want some braging rights
Corn Cod are common in Swell Ocean, uncommon in Rough Ocean. They eat vegetable floating in the water, and weight between 161.48 and 241.80. They are medium catch.
Before all Ocean Fishes were introduced, the Salty Dog update added Mobs called Deep Ocean Fish which could not be interacted with at the time of their inclusion. They were changed to Black Catfish as of Hook, Line, and Inker.