Millions Of Farmed Salmon And Trout Killed In UK Fish Farms; No Actions Taken Against Companies

[harumph]

1. Apparently H2S is formed in the fish waste at the bottom of the tank in RAS.

Managing H2S is then primarily making sure the fish waste is removed before anaerobic activity can produce H2S it at toxic levels. I would hazard a guess that something like floating vac systems are used. I don't think anyone has figured out an efficient way to architect RAS that handles (degrades) fish waste passively without H2S emissions - i.e., without requiring manual removal. In the cases cited, it seems pretty clear they weren't minding the farm.