Issues:
Sections:
Issue 92
GENERAL BIOLOGY
UDK: 597.552.512/57.022
ABOUT THE CONDITION OF THE EISENAM TROUT (SALMO TRUTTA EZENAMI): OVERVIEW OF HISTORICAL AND CURRENT DATA
Based on the literature data and own materials, the development of the ecosystem of Lake Kezenoi-Am over the past 100 years is described. It is shown that the ecosystem underwent a critical transformation as a result of the outbreak of chub numbers in the 70s of the XX century as well as the introduction of the river perch, wild goldfish and carp in 2012-2015. According to our research, collected literature and survey data, the Eisenam trout is represented by the two sympatric forms with the lake and river spawning. In modern conditions the lake perch is dominated by the river one, the subdominant species is chub. The local Terek gudgeon is currently displaced to the periphery of the ecosystem and is found only in the lower reaches of the tributaries. The valuable Eisenam trout in the lake has probably completely disappeared. Urgent measures are required to restore the endemic, including artificial breeding and reclamation measures to reduce the number of introduced species. The attempts to settle the Eisenam trout, except those undertaken in Lake Mochockh, are unknown. Therefore, until there is an opportunity, it is necessary to organize breeding of the Eisenam trout on the basis of the available mochokh trout.
Pages: 6 - 18
Date: 28.03.2024