Urchin

Urchins are found in Rivers or small ponds by the ocean. They can be harvested to obtain an Urchin.

Though sea urchins are technically animals, not plants, they are harvested and behave like other plants do in-game.

Urchin Item
After harvesting an Urchin you will need to use a Fishery to craft the Urchin into Raw Fish, which then can be eaten, or used in other recipes.

Crafting
Seeigel