Open AccessSTOCK ASSESSMENT AND LONG-TERM DYNAMICS OF AZOV SEA ROACH (RUSSIAN WATERS), BASED ON CMSY MODEL FOR DATA-LIMITED MODELLING IN PERIOD (1999-2019)
Author(s) -
Nikolay Zherdev,
M. Pyatinsky,
Inna Kozobrod
Publication year - 2020
Publication title -
rybnoe hozâjstvo
Language(s) - English
Resource type - Journals
ISSN - 0131-6184
DOI - 10.37663/0131-6184-2020-6-88-94
Subject(s) - overfishing , rutilus , stock assessment , fishing , stock (firearms) , fishery , population , fish stock , population model , environmental science , geography , ecology , biology , fish <actinopterygii> , demography , archaeology , sociology
Stock assessment of Azov sea roach Rutilus rutilus (Linnaeus, 1758) has been performed by CMSY model in period 1999-2019 by data-limited modelling in R. The current population status – in biological safe zone for stock biomass and no overfishing signals (B2019/BMSY = 1,32, F2019/FMSY = 0,53). Perhaps, current paper results can be a slightly incomplete in background that there is no relevant data about IUU fishery ever exists, which can lead to fishing mortality underestimation. Azov sea roach population continue to be in “depleted” status after river flow regulation in 1950’s. Joined continuous biomass estimates time series over whole fishing his-tory 1932–2019 showed at least 2 population collapses: in 1940’s and 1980’s years. According to model re-sults TAC (total allowed catch) should be accepted at level 516.9 t. If the recommendation is followed stock biomass will stay at safety in level 1828.1 t. Data limited modelling shows a good performance for sea roach in background of data lucking and in this reason still the best choose against cohor or surplus production models.