Rice paddy pesticides killed fish farm

Use of neonicotinoids on rice paddies linked to fishery collapse in Japan

A team of researchers with members affiliated with several institutions in Japan has found what they describe as compelling evidence of two fisheries collapsing due to use of neonicotinoid pesticides by nearby rice farmers. In their paper published in the journal Science, the team describes their study of fishery water quality data over two decades and what they learned from it. Olaf Jensen with Rutgers University has published a Perspective piece discussing the work by the team in the same journal issue.

Back in 1993, fishermen working at two fisheries on the lake found that yields had suddenly dropped dramatically. The reason for it was not known but many suspected it was tied to the use of neonicotinoid pesticides by nearby farmers—a new practice. To find out if that was indeed the case, the researchers gathered data obtained by other teams studying the lake over a period ten years before and after the collapse of the fisheries.

In looking at the results, the researchers found that the year following the first use of neonicotinoid pesticides in the local area, the amount of zooplankton in the lake nosedived. This was followed by a very swift drop in population of the fish that fed on them. More specifically, they found that zooplankton biomass shrank by approximately 83 percent. That year the smelt harvest was just 22 tons, a dramatic drop from an average haul of 240 tons each year.

https://m.phys.org/news/2019-11-neonicotinoids-rice-paddies-linked-fishery.html

See also; https://billymeier.wordpress.com/2019/07/02/the-truth-about-neonicotinoids/

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