Pre-Caucasian trout (Salmo trutta ciscaucasicus) as a necessary component of the Caspian ichthyofauna

Caspian trout is an arctic immigrant, endemic, and a subspecies of bull-trout that lives in the northern waters Russian Federation. There are three fish populations Caspian: Kura, Terek Samur. Kura most numerous population, contrast to [6] separated Samur into separate subspecies, calling it Ciscaucasian (Salmo trutta ciscaucasicus). Consequently, two Salmo currently live basin. The third described by Berg, alpine lake Eisenam, with area 160 hectares (Lake Andean). was formed as result landslide, maximum depth 75m. drainless its isolation from inflows Sulak River stable. As landslides, there lot cases formation. In 1905. landslide upper reaches at altitude about 2000 m above sea level, formed. Dzheneh, permanent inhabitant here, which D.Z. Demin caspius Kessler morphalacustris. At same time, important consider bull-trout, river Dagestan, unified reproduction fund River. Currently, population bred Primorsk Experimental Fish Hatchery, has certain production capacities 50 thousand units this juveniles piece weight 3-5g were produced 2020. It impossible catch breeders required quantities, since representative belongs first category species Red Book Federation - entire volume reared released larvae comes factory broodstock. 
 second largest terms water content, no information historical literature on visit breeding river, although brook all lakes proportion feeding capacity reservoir, here obstruction middle can be explained. Hence, follows stocks decreased due lack conditions for migration contrariwise. Considering trout, fund, doubt increase farms, necessary intensify work commercial cultivation their subsequent release lower Terek, Sulak, rivers other watercourses republic. Trout considered plastic fish. known facts transformation i.e. non-passable forms anadromous form – vice versa.
 various takes place within wide temperature ranges covers significant period time. So, course usually started autumn (September) lasted winter. summer, spring, winter races sea. locally called "samurbalyk".
 predatory increasing fish-breeding processes opportunity achieve historically indicators. number should play role ecological balancer ecosystem, being fourth link food chain reservoir time developing