Skins in "Fishing Force" are fun special cosmetic items. To obtain a large number of skins, first head to the Starting Island and buy plenty of beer to feed NPCs in exchange for empty cans. Then, switch your bait to "Empty Beer Can" and start fishing. After defeating the Spider Crabs that appear, collect their shells and insert them into the gacha machine to draw skins infinitely.
How to Obtain a Large Number of Skins in Fishing Force