Catch, abundance dynamics, and age structure of the open-sea Baltic herring in the ICES subdivision 26 in 2011–2017
Abstract
The article represents an analysis of biostatistical materials of the Baltic herring Clupea harengus membras from Russian research surveys and commercial catches in the ICES subdivision 26th of the Baltic Sea in 2011–2017. Russian herring catches are consisted of two groups of spring-spawning herring which amount is more than 90%. Coastal herring has dominated in the catches during the whole study period. Also a significant contribution to the overall herring catch was made by the open-sea herring, the average annual proportion of which was approximately 25% in numbers. Recently, there was an increase in the number of the open-sea herring in Russian catches. The largest catch was recorded in 2012 (4.5 thousand tons, 76.1 million specimens) and 2016–2017 (more than 3.5 thousand tons and 80 million specimens annually). The catch of the dominant coastal group has increased from the minimal 1.9 (2011) to 9.6 thousand tons in 2015, and then declined to 6.9 thousand tons during the last two years. Last three years, open-sea herring consists 30–40% of herring catches every quarter, while earlier it was maximum represented only in catches of the third quarter. Age structure of this herring group has changed: 3–6-year-old fish (especially the 3-year-olds of the abundant year-class of 2014) prevailed in 2016–2017, while in 2013–2015 individuals of older age groups (8 + group) were more numerous. The average weight-at-age of the open-sea herring in all age groups is lower than weight-at-age of the coastal herring. We had not reveal the influence of the increasing number in open-sea herring on the average size and age parameters of all herring caught in the 26th subdivision in 2017.
About the Author
I. S. Trufanova
Atlantic Fisheries Research Institute (FSBSI «AtlantNIRO»)
Russian Federation
Russian Federation
Kaliningrad
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Review
For citations:
Trufanova I.S. Catch, abundance dynamics, and age structure of the open-sea Baltic herring in the ICES subdivision 26 in 2011–2017. Trudy VNIRO. 2018;171:56-67. (In Russ.)
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