Underwater CO Shows Potential as Barrier to Asian Carp

[HarleyK]

http://www.sciencedaily.com/releases/2013/01/130123115243.htm



As the Asian carp population grows and the threat of the invasive species
entering Lake Michigan through one of the Chicago canals is monitored, a
University of Illinois researcher believes using two barrier methods is better
than one.

"In one experiment using tanks, we could actually chase the fish with the gas," Suski said. "Once carbon
dioxide reached a threshold, fish would 'choose' to leave the area of the tank that had CO₂. The fish
initially showed signs of being irritated or agitated after exposure, and eventually they lost equilibrium. If
fish cannot leave or are slow to leave the carbon dioxide accumulates to a point where it will act like an
anesthetic gas used for patients who are undergoing surgery."

 

[Fat Homer]

Interesting read, but how do they plan on administering enough Co2 to form a barrier like that? seems like they would need quite a lot of it to work?

 

[HarleyK]

Not a lot ... Simply follow the link and go to the original article: 3x increase already showed effects, 10x avoidance. It also seems to be commonly used in aquaculture.


Exposure of all species to 30 mg·L −1 dissolved CO 2 for 1 h, compared with ambient CO 2 concentrations of 10 mg·L −1 , resulted in an elevated stress response, along with alterations to ionic–osmotic balance. Exposure of fish to 70 mg·L −1 CO 2 caused a reduction in ventilation rates after 1 h, while both silver carp and bighead carp lost equilibrium. Silver carp, largemouth bass, and bluegill also showed avoidance of CO 2 at approximately 100 mg·L −1 .



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