FAO's fisheries market news roundup covers several items dated September 2019, including expected higher global pangasius production led by Viet Nam, a sharp upward revision in Atlantic mackerel catch advice, and lower Peruvian anchovy quotas. The page also lists later-dated items on salmon and Greek aquaculture.
Fishmeal and fish oil supply depends heavily on Peruvian anchovy quotas, so a lower quota tightens meal supply and supports fishmeal prices. Higher mackerel and pangasius supply is more bearish for whitefish and protein prices.
Not enough comparable past events yet for a historical read.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.