Like I said earlier and as others have said SE just need to put the recipes that were in 1.0 that allowed and Alchemists to create crystals and shards from fish. The higher level the fish the more shards or crystals the fish yielded, it also different fish yielded different types of crystals and shards so if you wanted a certain type of crystal or shard you would target a specific fish.

I thought it was pretty good and allowed both alchemy and fishing to make some gil. The higher level you got in both your fields the higher the amount of shards/crystals would yield. I really don't know why SE removed it, well I suppose it was to get rid of the fish bots but now we have mining and botany hacks so that obviously didn't work.