The fishermen's village was bustling as always, with the lizardfolk casting their nets on the vast lake.
Said lake wasn't there when humans were still ruling over that area, and instead was created almost a decade after they left, thanks to the help of a few giants blocking the valley from both sides and a whole army of goblin, orkish, and lizardfolk's shamans causing rainfall for five month's straight.
After that, it was only a short work for the merfolk to help introduce the fastest breeding fishes and viola!
The villagers' catch would be used to feed the villagers - of course - but the surplus would get transported by a monster with an ice ability to both other villages and even the monster city itself.
The fishermen's village was also prepared to start trading with humans when - or even if - such an option becomes a possibility.