Similar to Fish Knowledge, fishery knowledge points are being drawn from magazines.
The difference is that fishery knowledge points are being drawn from continental magazines - every continent will have its own magazines with knowledge points for fisheries from that continent.

After acquiring enough points for a fishery, you may level up that fishery, which will provide you with one set slot.

You can draw sets on that spot.
Sets are special passive bonuses for one fish available on that fishery. After acquiring such a set, the bonuses will affect the drawn fish caught on that fishery.
There are 4 rarities available for every set. The rarer the set is, the better the bonuses will be.
You may redraw a single set or a list of different sets with the ability to chose one.

Some events may require that you redraw a certain set, or redraw and keep a specific set.