Fishery and biology characteristics of pike off the Dagestan coast of the Caspian Sea
2019
Butaeva, A.K. | Abdusamadov, A.S. | Taibov, P.S. | Akmaev, E.A. | Ashumova, S.G. | Shabanova, M.M. | Abdusamadov, T.A. | Guseinov, A.D.
Because of own and literature data shows some features of the biology and fisheries of the ordinary pikeEsox lucius in the coastal waters of the Terek-Caspian fishery subarea. Features of formation of stocks ofthis field object in the conditions of influence of climatic and anthropogenic factors are shown. It is revealedthat the reduction of spawning area in the last decade as a result of the Caspian sea level decrease, as well asa high proportion of unaccounted and poaching are the leading factors affecting negatively the state of pikestocks in the sub-district. The number of young pike in the surveyed area with fluctuations over the yearshas a General tendency to decline. As a result, during the period from 1997 to 2019, the commercial stocksof pike in the Tersko-Caspian fisheries sub-region decreased from 3.8 to 1.1 thousand tons, i. e. almost3.5 times. Under the influence of intensive fishing, there are changes in the structure of pike populations.During the period from 2013 to 2017, the average age of pike decreased from 4.2 to 3.8 years, the averagelength from 57.8 to 47.7 cm, and weight — from 2.16 to 1.25 kg. The consequence of the reduction ofpike stocks in the area under consideration is likely to reduce its role in the regulation of small freshwaterfish. For example, the commercial reserves of Rudd on the Dagestan coast of the sea from 2007 to 2018increased from 0.51 to 1.24 thousand tons, and carp for the same period — 1.3 to 1.83 thousand tons.Recommendations on conservation and restoration of pike stocks in the region are given.
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تم تزويد هذا السجل من قبل Russian Federal Research Institute of Fisheries and Oceanography