Spooky spectral fish on show at west Japan aquarium's yokai-themed exhibition until Oct. 31 
US Source: jsonline 8/30/2021
Spooky spectral fish on show at west Japan aquarium's yokai-themed exhibition until Oct. 31
Credit: Dan Egan, Milwaukee Journal Sentinel
A fish pond in Missouri reveals just how stealthy Asian carp can be.

Maybe an acre in size, the pond had been stocked with catfish, bass and bluegills. The owner was pumping it full of fish food, yet the fish appeared to be starving. So in early 2010 the owner called in a consultant.

"They came out with electrofishing gear, caught some fish and looked at them," said Duane Chapman, one of the country's leading Asian carp experts and a biologist with the U.S. Geological Survey. "The fish were emaciated and he didn't know why. He said, 'There's something wrong here. We need to start over again.' They brought in rotenone and completely killed the pond."
 

Over the next week, the rotting carcasses of about 300 bighead carp surfaced. The smallest were 20 pounds. The big ones were a border collie-sized 35 pounds. Poisoned Asian carp, Chapman explained, are different from many fish species in that they typically don't surface unless the water is warm enough for gases to build up in their bellies, a process that can take a week.

"It was quite amazing there could be that much poundage in one small pond," Chapman said.

It turned out that a decade earlier the previous property owner had stocked the pond with bighead. They had flourished right under the nose of the new owner, who had smelled trouble - but couldn't see a thing.

 
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