Allow us to store fish at our houses (preferably garages maybe because a refrigerator just happens to be inside). Once maximum fish storage is reached, there should be a way for us to load the fish into our vehicle and deliver it to businesses.
NOTE: This goes without saying, a message should always popup advertising you can store fish in house to then deliver them in big quantity for extra amount of money, etc.
Why?
Mainly, to create far more satisfying method for selling fish (should be more profitable and fun than selling fish at bait shops to account for delivery time, etc.). Secondly, it adds more value to houses, more people will buy houses from server (Avery Properties), recently I noticed new players are willing to buy houses, they are just not advertised good enough for them to consider.
