Cancers of the Rostov region are having a good summer
Experts of the Azov fisheries research Institute has carried out monitoring of crayfish stocks in the basin of the river Sal, and the Manych reservoirs. The results of studies of populations was found satisfactory, living conditions are favorable.
In the period from 23 July to 3 August scientists of Azniirkh conducted two field expeditions in the basin of the river Sal, and the Manych reservoirs of the cascade. Feature of this year was abnormally hot June. Rapid heating of the water contributed to the development of submerged aquatic vegetation – mostly hornwort, It is a favorite forage of crawfish and a safe haven for the younger juveniles.
As reported Fishnews in the press service of the Institute, in the summer hypoxic events were observed. Rhopalidae the disease was found in mild form for some stations in the pool of Fat in the Veselovsky reservoir.
Molting fishing individuals wore extended character. 10% crayfish (river Sal) to 40% (Ust-Manych reservoir) during the research were at different stages of molting. The overall population density was highest in the pool of Fat, then descending in the proletarian, Veselovsky and Ust-Manych reservoirs. The density is the same recorded in the summer of 2017 level.
Based on the results of expeditionary investigations of the population status of crayfish in the ponds as a whole is estimated as satisfactory. Habitat for crayfish of all ages were favorable.
According to the materials: fishnews.ru