My personal problem with fishing is how tedious it is of a gathering source for anything. The uses of -fish- for the most part are limited to culinarian, alchemist, and goldsmith, but if you're trying to harvest a larger amount of a specific item you're left fishing for hours on end trying to get even a stack of a certain catch. Botanist and Miners have it different however, Botany has Blessed Harvest I and II, Miner gets King's Yield I and II.
Miner and Botany also get a secondary weapon/tool; Where's fishing's offhand net?



Above is a comparison to the amount of skills available to fishing in comparison to miner and botany, the other gathering classes. I use this as reference to show there is plenty of room to add a netting system or skill-set.