Peculiarities of recruitment indices application in forecasting the chub mackerel stock dynamics in the Eastern-Central Atlantic
Abstract
The recruitment surveys carried out in the Eastern-Central Atlantic since 2003 provide statistically reliable abundance indices of the 0- and 1-old age groups of chub mackerel. The significance of the first ones for the stock control is dwindled by two circumstances. When the strongest generations appear, 0-group becomes an object of purse seining, for the first months of life, the physiological conditions worsen, and pattern of ontogenetic movements alters. In such cases, the 0-group survey indices obtained in the end of year do not correlate well with the indices of 1-group obtained one year later. Those correlations are observed at moderate level of recruitment only. The combination of indicators of the upwelling intensity and the seasonal dislocation of the Senegalese-Mauritanian hydrological front seems to be as an acceptable basis to predict abundance of one-year-old fishes. This abundance is the higher the more logically hydrological situation develops, that is, when the dynamics of latitudinal movements of the front is consistent with the upwelling intensity.
About the Author
N. M. Timoshenko
Atlantic Fisheries Research Institute (FSBSI «AtlantNIRO»)
Russian Federation
Russian Federation
Kaliningrad
References
1. Eliseeva I. I., Yuzbashev M. M. 2005. Obshchaya teoriya statistiki [General Theory of Statistics]. M.; Finansy i statistika, 657 s.
2. Malinin V. N., Chernyshchkov P. P., Gordeeva S. M. 2002. Kanarskij apvelling: krunomasshabnaya izmenchivost’ i prognoz temperatury vody [Canary upwelling; large-scale variability and water temperature forecast]. SPb.: Gidrometeoizdat. 154 s.
3. Timoshenko N. M., Provotorova A. N. 1999. Mekhanizm prisposobleniya molodi skumbrii k osobennostyam dinamiki vod Kanarskogo apvellinga [Mechanism of adaptation of Scomber colias juveniles to peculiarities of the Canary upwelling water dynamics] // Rybokhozyajstvennye issledovaniya Mirovogo okeana. Trudy Mezhd.nauch. konf. Tez. dokl. T. 1. Vladivostok.27–29 09.1999 g. S. 165–166.
4. Timoshenko N. M., Vinnitskij P. A. 2007. Planirovanie, rezul’taty i sovershenstvovanie kolichestvennogo ucheta popolneniya pelagicheskikh ryb Tsentral’no-Vostochnoj Atlantiki [Planning, results and improvement of quantitative assessment of recruitment of pelagic fish of the Eastern-Central Atlantic] // Promyslovobiologicheskie issledovaniya FGUP «AtlantNIRO» v 2004–2005 gg. T. 1. Usloviya sredy, metody issledovaniya, dinamika chislennosti gidrobiontov i promyshlennoe rybolovstvo. Kaliningrad. S. 72–76.
5. Oceanographic and biological features in the Canary Current Large Marine Ecisystem. 2015. / Valdés, L., Déniz-González, L. (eds). IOC-UNESCO, Paris. IOC Technical Series, No. 115: 383 pp.
6. Report of the FAO working g roup on the assessment of small pelagic fish off Northwest Africa. Nouadhibou, Mauritania, 22–27 May 2017, 298 р. Accessible via: http://www.fao.org/3/i8896b/I8896B.pdf
Review
For citations:
Timoshenko N.M. Peculiarities of recruitment indices application in forecasting the chub mackerel stock dynamics in the Eastern-Central Atlantic. Trudy VNIRO. 2018;174:72-80. (In Russ.)
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