North American catfish thronging fishes of the Kuban
North American catfish, introduced 30 years ago in Krasnodar region, thronging fish-natives, including our native European catfish.
American channel catfish was brought in a fish farm of the Krasnodar territory in the 1970s, the years for cultivation in fish farms. Meat it is tasty, few bones, and consumers eagerly bought them at markets. But from fish farms catfish caught in the river Kuban and Bolshoi yegorlyk (Rostov region). In the Rostov region, this species also inhabits the channel-cooler of the Novocherkassk GRES and proletarian reservoir. Now, as shown by the studies of ichthyologists South scientific center of RAS, the number of stranger in the Bolshoy Egorlyk river has increased dramatically.
First, as confirmed by the expedition of 2004, catfish is caught in the area Bronikowski dam (downstream of the river the Bolshoy Egorlyk river). Ichthyologists found here the young of different ages and of adult fishes. However, for the past thirty years catfish became smaller in size. When he appeared on the Kuban, he weighed an average of about 4 kg now. it weighs less than 1,5 kg. the Expedition of the southern scientific center of RAS, organized this year, showed that due to a sharp increase in the number of americanclassic significantly decreased the population of native fish such as carp, silver carp, white bream. The fact is that American catfish eat not only the larvae of dragonflies and water beetles. This river predator also eats the young of other native fish. He himself, with three spines on his back, almost invulnerable to predators.
As told senior researcher at UNC Academy of Sciences, doctor of biological Sciences Mikhail Abramenko, if the fishing world lost one species, then over time this can cause changes in the entire fish fauna of the reservoir.
– Now we are seeing a reduction in the number of aboriginal species is common (European) catfish. This demersal predatory fish, a sort of “biological black boy” rivers. He eats “weed” species of fish, e.g. goldfish. American catfish multiplies rapidly, competes in the production of food, thereby accelerating the disappearance of catfish. If in the future the place of the European catfish in. completely is a channel catfish, it is difficult to predict how it will behave in the reservoir. With confidence we can say only that if in the Rostov region will come in several cold winters, heat-loving catfish may die. And then the pond will remain without two predatory fish species, which are so necessary to a Large..