1. Fish is a crafting item for spidertron, it's not completely useless. 2. In multiplayer, the standard null-value item is the deconstruction planner (which is a big red square). I guess some people might use fish, but I've never seen it. It helps that deconstruction planners are free, nowadays, if you click the red button at the bottom-screen UI. 3. Fish is incredibly useful for fighting in early-game - if a nest won't stop bugging you, just go to the nearest pond, grab a few dozen fish, and you're basically invincible for a few minutes as long as you spam fish whenever you reach low health. Make sure to bring extra pistol ammo though, otherwise killing the nests will take ages (you can melee them to death but it deals even less damage than pistols).
