So, we already have those, basically. in the laboratory. but... why should only they have all the fun?

first part of my proposal is that you also have an aquarium and a terrarium. it can be a building which is already fully equipped or you can simply give us a blueprint for small/medium/big aquarium that we can put in our houses, and where we can fill in our fishes and critters.

ideally putting stuff in them would also count for the critter finding quest, but that's optional.

Part B is: when you put fish of a same kind in an aquarium, they'll give birth to new fish... raising fish, raising your food essentially. then you can take them out and eat them fresh. that'd be nice. since you already brought fishing, raising fish is simply a different approach, so there should be no complaints, and taking them out and eating them is completely optional, so raising them would maybe even interest people in fishing that were against it previously, because now it's not only related to eating them anymore.