Ok, I KNOW fishing is very new still, and that KI has many plans for this (ok, this is an educated guess), but here's my ideas for how to improve fishing:
1) Polymorph Fish (one for each school) – Magically changes all the fish in a single area to a school you want. All fish will maintain their size/rareness. Once the fish respawn (either by spell or time), you’ll have to cast the spell again. Due to the nature of this spell, it should have a high fishing level AND energy requirements.
2) Transmute Fish to Snack - Turns fish into pet snacks. KI would have to make a scale of fish sizes and commonality. The smaller/most common fish would have a lower rank and the largest/most rare fish would be the highest rank. The snack’s school would be based off of the fish’s school. Perhaps just use a scale of weight for rank, and then rarity for an extra level of snack rank. So, for example, a 100 pound whopper would be a mega snack
3) Next level of fishing lures should let us use bait. What would be the bait you ask? That’s simple, pet snacks. Here’s how it would work:
A) The pet snack school MUST match the school of the lure B) It would make it so only fish that match the lure’s school would be attracted C) it would add 1%, per level of snack, to our fishing luck D) Snacks higher than rank 4 are not allowed