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Fish farms along the Minjiang River in the Shuikou Township section of East China's Fujian province have been hit by a wave of fish kills in recent days, but the cause has yet to be determined, local authorities said on Sunday.
Some 9,000 tanks of fish, including about 8,000 in Shuikou town and some 1,000 in Huangtian town, were reported dead as of Saturday, according to a release from the government of Gutian county, which administers the two townships.
One tank usually holds 3,500 to 5,000 fish.
Zeng said that local fishery and environmental protection departments are investigating the case and examining the water, but the reasons for the fish die-offs are unknown.
We also found that the fish turned white after they died. That is abnormal, and that phenomenon doesn't occur with deaths from oxygen insufficiency," he said. "The water is black and has something like oil on the surface."
Now, this is were my day took a turn. I was at the far East corner working a small drop off and hump. Within about 15 mins the water in a 100 yard stretch started to turn Pee Green Milky looking. Then a small of sulferish... yucky. 10 mins later, I see a shad swimming on the surface dying. Another ten mins later 20 shad gulping air. 15 mins later 1000 shad dying. 15 mins later, Millions of shad, buffs, carp, drum all gulping air and beaching themselves.
If you smelled sulphur dioxide it does indicate that the anerobic layer of water somehow inverted - that does two things during hot water temps - first it brings up a layer of water where dissolved oxygen is at less than 2PPM - a death sentence for any fish, second the water in the anerobic layer is generally around 61 degrees - which is why you first saw shad affected - they couldn't stand the rapid water temp change of THIRTY degrees along with lack of oxygen - it would affect the smallest fish FIRST followed by progressively larger fish which didn't escape the flip flop of the thermal layer.
That could very well have been a hydrogen sulfide (H2S) release from the lake floor reacting with the water and forming sulfur dioxide(SO2). This is common when organic matter decays under water causing a pocket of SO2 and H2S to push up to the surface and "belch" into the air. As explained by someone else earlier, this is why the fish were dying. The sulfur compounds would account for the rotten sulfurish smell you noticed(CH4 (mehtane) is odorless in nature so it couldnt have been methane). H2S is a highly deadly gas and is Immediately Dangerous to Life and Health at only 100 Parts Per Million in air.
Originally posted by Vitchilo
Zeng said that local fishery and environmental protection departments are investigating the case and examining the water, but the reasons for the fish die-offs are unknown.