For more information on the Invasive Species Act and Regulations visit www. Asian carps were brought from Asia to North America in the s and 70s. Since then they have migrated north through U. Asian carps prefer cool to moderate water temperatures, like those found near the shores of the Great Lakes. If Asian carps become established in Ontario waters, they could potentially eat the food supply that our native fish depend on and crowd them out of their habitat. Bighead Carp and Silver Carp are the species that have spread the most aggressively and can be considered one of the greatest threats to the Great Lakes. Silver Carp are a hazard for boaters.
Study: Asian carp could find plenty of food in Lake Michigan
Fisheries and Oceans Canada
Several species of heavy-bodied cyprinid fishes are collectively known in the United States as Asian carp. Cyprinids from the Indian subcontinent—for example, catla Catla catla and mrigal Cirrhinus cirrhosus —are not included in this classification and are known collectively as "Indian carp". All the above, except largescale silver carp, have been cultivated in aquaculture in China for over 1, years. Largescale silver carp, a more southern species, is native to Vietnam and is cultivated there. Grass, silver, bighead, and black carp are known as the "Four Domesticated Fish" in China and are the most important freshwater fish species for food and traditional Chinese medicine. Bighead and silver carp are the most important fish, worldwide, in terms of total aquaculture production.
Asian carp in North America
AP — Asian carp are likely to find enough food to spread farther if they establish breeding populations in Lake Michigan, reinforcing the importance of preventing the invasive fish from gaining a foothold, scientists said in a paper released Monday. A study led by University of Michigan researchers found that despite a drop-off in plankton, the tiny plants and animals on which bighead and silver carp typically feed, the lake has enough dietary options to sustain individual fish that venture away from nutrient-rich shoreline areas where most would congregate. That improves their prospects for colonizing large sections of Lake Michigan and eventually spreading to the other Great Lakes, said Peter Alsip, an ecological modeling data analyst and lead author of the paper published in the journal Freshwater Biology. Asian carp were imported in the late s to gobble up algae in Deep South sewage lagoons and fish farms.
Silver Hypophthalmichthys molitrix and bighead H. Controlling bigheaded carp is a priority of fisheries managers and one area of focus involves developing acoustic deterrents to prevent upstream migration. For an acoustic deterrent to be effective however, the hearing ability of bigheaded carp must be characterized. A previous study showed that bigheaded carp detected sound up to 3 kHz but this range is narrower than what has been reported for other ostariophysans. Therefore, silver and bighead carp frequency detection was evaluated in response to Hz to 9 kHz using auditory evoked potentials AEPs.