Over the past few days, I have read several articles on a massive fish kill that left 35 tons of dead fish in lake in Hainan China. Unlike a fish kill from a major dock/warehouse fire last year where cyanide and other compounds got into the water, the cause of this fish kill is not as obvious. Early speculation blames an increased salinity in the water. While some may think of this as natural, there is potential for industrial runoff, diversion of fresh water flows and other human activities to change the salinity in a lake.
Key is that an indicator species, fish, have been killed by some agent. Also, the amount of fish (35 tons) represents a huge pollution load that can further degrade the lake's ecosystem.
Here is a link to an article with pictures.
Erik Rumbaugh has been involved in biological waste treatment for over 20 years. He has worked with industrial and municipal wastewater facilities to ensure optimal performance of their treatment systems. He is a founder of Aster Bio (www.asterbio.com) specializing in biological waste treatment.
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