Методика определения запаса, промысловой и естественной смертностей шпрота восточной Балтики.
By the results of trawling surveys carried out in May 1977 - 1981 a relative sprat stock by subdivisions was determined. Simultaneously, in spring 1977 an absolute sprat eggs amount was found for Subdivision 26, and proceeded from its abundance, sprat fecundity, males and females ratio and the share of spawning females, an absolute sprat stock was calculated. By the ratio of relative and absolute stock values in Subdivision 26 in 1977 a transitional coefficient was determined for the recalculation of relative stock values found by the trawling survey method into absolute ones. The obtained stock values for Subdivisions 26 and 28 in 1977 - 1981 are comparable with those defined by VPA on the ICES Working Groups. It was determined that in present VPA method overestimates the Baltic sprat stock abundance to a great extent that in its turn leads to an overestimated value of TAC predicted. The trawling survey method gives a more precise estimate of a stock value. Main reasons conditioning the errors in VPA application for the determination of Baltic sprat absolute stocks are revealed, and concrete ways of investigations which allow increasing the VPA method precision concerning the Baltic sprat are offered.
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Format: | Journal Contribution biblioteca |
Language: | Russian |
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1983
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Subjects: | Trawling surveys, Absolute stock, Relative stock, Baltic sprat stock, ASFA_2015::F::Fish stocks, ASFA_2015::N::Natural mortality, ASFA_2015::F::Fishing mortality, |
Online Access: | http://hdl.handle.net/1834/15795 |
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dig-aquadocs-1834-157952021-05-19T06:57:45Z Методика определения запаса, промысловой и естественной смертностей шпрота восточной Балтики. Methods for determination of the stock, fishing and natural mortalities in the Eastern Baltic sprat. Shvetsov, F.G. Trawling surveys Absolute stock Relative stock Baltic sprat stock ASFA_2015::F::Fish stocks ASFA_2015::N::Natural mortality ASFA_2015::F::Fishing mortality By the results of trawling surveys carried out in May 1977 - 1981 a relative sprat stock by subdivisions was determined. Simultaneously, in spring 1977 an absolute sprat eggs amount was found for Subdivision 26, and proceeded from its abundance, sprat fecundity, males and females ratio and the share of spawning females, an absolute sprat stock was calculated. By the ratio of relative and absolute stock values in Subdivision 26 in 1977 a transitional coefficient was determined for the recalculation of relative stock values found by the trawling survey method into absolute ones. The obtained stock values for Subdivisions 26 and 28 in 1977 - 1981 are comparable with those defined by VPA on the ICES Working Groups. It was determined that in present VPA method overestimates the Baltic sprat stock abundance to a great extent that in its turn leads to an overestimated value of TAC predicted. The trawling survey method gives a more precise estimate of a stock value. Main reasons conditioning the errors in VPA application for the determination of Baltic sprat absolute stocks are revealed, and concrete ways of investigations which allow increasing the VPA method precision concerning the Baltic sprat are offered. Приведены результаты определения абсолютного промыслового запаса балтийского шпрота на основе тралово-учетных съемок распределения скоплений рыб, ихтиопланктонных съемок, данных о плодовитости и других и других биологических показателей шпрота для периода 1977-1981 гг. На основании анализа динамики численности и величины уловов рассчитаны величины естественной и промысловой смертностей шпрота в подрайонах 26 и 28 в 1977, 1978, 1979 и 1980 гг. 7. ausgabe des sonderheftes über fischereiliche untersuchungen der DDR und der UDSSR in der Ostsee. 7. выпуск совместного сборника научных статей по вопросам рыбохозяйственных исследований ГДР и СССР в Балтийском море. Published 2019-11-14T14:01:14Z 2019-11-14T14:01:14Z 1983 Journal Contribution Not Known 0428-4984 http://hdl.handle.net/1834/15795 ru pp. 58-60 Baltic Sea Eeastern Baltic |
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topic |
Trawling surveys Absolute stock Relative stock Baltic sprat stock ASFA_2015::F::Fish stocks ASFA_2015::N::Natural mortality ASFA_2015::F::Fishing mortality Trawling surveys Absolute stock Relative stock Baltic sprat stock ASFA_2015::F::Fish stocks ASFA_2015::N::Natural mortality ASFA_2015::F::Fishing mortality |
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Trawling surveys Absolute stock Relative stock Baltic sprat stock ASFA_2015::F::Fish stocks ASFA_2015::N::Natural mortality ASFA_2015::F::Fishing mortality Trawling surveys Absolute stock Relative stock Baltic sprat stock ASFA_2015::F::Fish stocks ASFA_2015::N::Natural mortality ASFA_2015::F::Fishing mortality Shvetsov, F.G. Методика определения запаса, промысловой и естественной смертностей шпрота восточной Балтики. |
description |
By the results of trawling surveys carried out in May 1977 - 1981 a relative sprat stock by subdivisions was determined. Simultaneously, in spring 1977 an absolute sprat eggs amount was found for Subdivision 26, and proceeded from its abundance, sprat fecundity, males and females ratio and the share of spawning females, an absolute sprat stock was calculated. By the ratio of relative and absolute stock values in Subdivision 26 in 1977 a transitional coefficient was determined for the recalculation of relative stock values found by the trawling survey method into absolute ones. The obtained stock values for Subdivisions 26 and 28 in 1977 - 1981 are comparable with those defined by VPA on the ICES Working Groups. It was determined that in present VPA method overestimates the Baltic sprat stock abundance to a great extent that in its turn leads to an overestimated value of TAC predicted. The trawling survey method gives a more precise estimate of a stock value. Main reasons conditioning the errors in VPA application for the determination of Baltic sprat absolute stocks are revealed, and concrete ways of investigations which allow increasing the VPA method precision concerning the Baltic sprat are offered. |
format |
Journal Contribution |
topic_facet |
Trawling surveys Absolute stock Relative stock Baltic sprat stock ASFA_2015::F::Fish stocks ASFA_2015::N::Natural mortality ASFA_2015::F::Fishing mortality |
author |
Shvetsov, F.G. |
author_facet |
Shvetsov, F.G. |
author_sort |
Shvetsov, F.G. |
title |
Методика определения запаса, промысловой и естественной смертностей шпрота восточной Балтики. |
title_short |
Методика определения запаса, промысловой и естественной смертностей шпрота восточной Балтики. |
title_full |
Методика определения запаса, промысловой и естественной смертностей шпрота восточной Балтики. |
title_fullStr |
Методика определения запаса, промысловой и естественной смертностей шпрота восточной Балтики. |
title_full_unstemmed |
Методика определения запаса, промысловой и естественной смертностей шпрота восточной Балтики. |
title_sort |
методика определения запаса, промысловой и естественной смертностей шпрота восточной балтики. |
publishDate |
1983 |
url |
http://hdl.handle.net/1834/15795 |
work_keys_str_mv |
AT shvetsovfg metodikaopredeleniâzapasapromyslovojiestestvennojsmertnostejšprotavostočnojbaltiki AT shvetsovfg methodsfordeterminationofthestockfishingandnaturalmortalitiesintheeasternbalticsprat |
_version_ |
1756076811364597760 |