The Shrimps:
These nice crustaceans are found quite frequently in the oceans, in large groups.
By killing them, it is possible to cook and eat them (the fastest method to cook them is via a campfire)
If, on the other hand, you intend to become a friend of these splendid crustaceans (perhaps by placing them in an aquarium), it is possible to collect them with a bucket of water.
Golden Shrimps:
By surrounding a cooked prawn with 8 gold nuggets in a crafting table, it will be possible to obtain a golden shrimp, a decidedly powerful food that allows you to obtain high resistance.
Apparently prawns are really cool, especially when golded.