If there might be pizza added to the game, there could be anchovies added from fishing them. For the fishing system i thought about cage fishing for crabs or lobsters.
For net fishing we could see a school of fish moving around that has a few spawn in a area with a time limit so it don't go overboard with the spawning. We would have to work on our aim and as we hold down left click and release, it will throw the net.
Cage fishing would be a simple task if we had bait for them. It gave me and idea to me today when i went to work, it was raining as i walk to work and i saw a ton of earthworms on the side walk and concrete. So there must be rain in the game to increase our chance to find bait as earthworms. Fish also has a big spawning chance while it rains and we find much rare fish then. We should be able to collect the worms when we see them wiggle to the surface and we just collect them as we see them.
There could be other bait to attract other kinds of fish. Harpoons could be another great tool if there is bigger kinds or fish or defending yourself from other predators. Will this add alligators to the game if there is a swamp biome? Alligators would be a nice idea for other peoples moat of death if they wish. Pythons will be a nice addition to the swamp or they like to roam to other biomes. I thought alot about pythons being tamable for being a nice pet.