Fish can be caught by Fishing or are a drop from monsters.
“It feels strange. It feels like it doesn't weigh anything. Restores 40 SP Decreases hunger by 8...Torp Fish
“A small blue fish. Restores HP by 60 Decreases hunger by 8 Stacklimit: 5 Fishing at Blizzard's...Small Bass
“A floppy little fish, looks delish. Restores SP by 60 Decreases hunger by 10 Stacklimit: 5 By...Swemn Fish
“Wow.. is it just me, or are the fish getting bigger. Restores HP by 100 Decreases hunger by 12...Trout