Right now, there's an imbalance in how fishing plays and it's core rare resource that it produces; Crushed Shells.
Used by Masons, Crushed shells are the backbone of codex pushing. It has a similar distribution curve to other rare items; you need far more low tier than you will need high tier.
But unlike many of the other sources of rares, the action you do to produce the crushed shells (creating bait from baitfish) has less and less value to the fisher the higher tier of fisher they are above the tier of shell that's needed. T1 is the poster child of this problem.
T1 Stone produces braxite and pebbles, which are needed for refined bricks. T1 Berries become fertilizer for wispweave, and crop oil while giving citrics. T1 Animals make pelts which become refined leather, while giving animal hair.
T1 fish oil is the base resource that creating T1 bait helps you acquire, but in the current quantities that players get bait in means that many fishers have ended up with an absolute deluge of t1 bait which they could never possibly chew through. It only takes one t4 or t5 codex push to acquire so much t1 bait that you will never find yourself fishing T1 baitfish for bait, and so there is rarely ever an excess of crushed shells in any player's inventory unless it's by active choice.
In this current iteration, T1 baitfish and shells are becoming a chore when higher tier bait is always in need and always in use. Please consider more uses for T1 bait, potentially less bait (I know this is unpopular), potentially more shells, or an alternative source of crushed shells that makes the process of acquiring these shells actually beneficial to the fisherman rather than something they have to force themselves to do for no reward for their own skill progress.