Acoustic estimates of 0-group fish abundance in the Barents Sea and adjacent waters in 1992 and 1993
Precision and relevance of pre-recruit studies for fishery management related to fish stocks in the Barents Sea and adjacent waters. Proceeding of the sixth IMR-PINRO Symposium Bergen, 14-17 June 1994 Acoustic and biological data collected during the international O-group surveys in 1992 and 1993 we...
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ftimr:oai:imr.brage.unit.no:11250/107696 2023-05-15T15:38:47+02:00 Acoustic estimates of 0-group fish abundance in the Barents Sea and adjacent waters in 1992 and 1993 Nakken, Odd Hylen, Arvid Ona, Egil 1995 579151 bytes application/pdf http://hdl.handle.net/11250/107696 eng eng PINRO-IMR Symposium 6 http://hdl.handle.net/11250/107696 s. 187-197 0-gruppe 0-group Conference object 1995 ftimr 2021-09-23T20:14:27Z Precision and relevance of pre-recruit studies for fishery management related to fish stocks in the Barents Sea and adjacent waters. Proceeding of the sixth IMR-PINRO Symposium Bergen, 14-17 June 1994 Acoustic and biological data collected during the international O-group surveys in 1992 and 1993 were used to estimate the abundance of O-group fish of 4 species; cod, haddock, redfish and polar cod. The abundances of O-group cod amounted to 107*109a nd 84 -lo9s pecimens in 1992 and 1993 respectively. These estimates are considerably higher than those arrived at by the swept volume/area method when resonable values for trawl catch efficiencies were applied. Instantaneous mortality rates of 8-9 were calculated from the acoustic estimates of O-group in August and l-group in February for cod of the 1992 and 1993 year classes. The acoustic estimates of O-group haddock abundance amounted to 12.109 and 8-lo9 specimens and the ratio between cod and haddock abundances were significantly higher for the acoustic estimates than for the traditional indices of O-group abundance. For the two year classes under observation instantaneous mortality rates of 4-5 were arrived at from the acoustic estimates of O- and l-group haddock. For O-group redfish the acoustic estimates of abundance amounted to 38-lo9 and 48.109 specimens in 1992 and 1993 respectively. The estimates z,.rived at for O-group polar cod, 100.10~ and 62-lo9 specimens, were underestimates due to insufficient acoustic coverage of the O-group polar cod distribution area in both years. Conference Object Barents Sea polar cod Institute for Marine Research: Brage IMR Barents Sea Bergen |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
0-gruppe 0-group |
spellingShingle |
0-gruppe 0-group Nakken, Odd Hylen, Arvid Ona, Egil Acoustic estimates of 0-group fish abundance in the Barents Sea and adjacent waters in 1992 and 1993 |
topic_facet |
0-gruppe 0-group |
description |
Precision and relevance of pre-recruit studies for fishery management related to fish stocks in the Barents Sea and adjacent waters. Proceeding of the sixth IMR-PINRO Symposium Bergen, 14-17 June 1994 Acoustic and biological data collected during the international O-group surveys in 1992 and 1993 were used to estimate the abundance of O-group fish of 4 species; cod, haddock, redfish and polar cod. The abundances of O-group cod amounted to 107*109a nd 84 -lo9s pecimens in 1992 and 1993 respectively. These estimates are considerably higher than those arrived at by the swept volume/area method when resonable values for trawl catch efficiencies were applied. Instantaneous mortality rates of 8-9 were calculated from the acoustic estimates of O-group in August and l-group in February for cod of the 1992 and 1993 year classes. The acoustic estimates of O-group haddock abundance amounted to 12.109 and 8-lo9 specimens and the ratio between cod and haddock abundances were significantly higher for the acoustic estimates than for the traditional indices of O-group abundance. For the two year classes under observation instantaneous mortality rates of 4-5 were arrived at from the acoustic estimates of O- and l-group haddock. For O-group redfish the acoustic estimates of abundance amounted to 38-lo9 and 48.109 specimens in 1992 and 1993 respectively. The estimates z,.rived at for O-group polar cod, 100.10~ and 62-lo9 specimens, were underestimates due to insufficient acoustic coverage of the O-group polar cod distribution area in both years. |
format |
Conference Object |
author |
Nakken, Odd Hylen, Arvid Ona, Egil |
author_facet |
Nakken, Odd Hylen, Arvid Ona, Egil |
author_sort |
Nakken, Odd |
title |
Acoustic estimates of 0-group fish abundance in the Barents Sea and adjacent waters in 1992 and 1993 |
title_short |
Acoustic estimates of 0-group fish abundance in the Barents Sea and adjacent waters in 1992 and 1993 |
title_full |
Acoustic estimates of 0-group fish abundance in the Barents Sea and adjacent waters in 1992 and 1993 |
title_fullStr |
Acoustic estimates of 0-group fish abundance in the Barents Sea and adjacent waters in 1992 and 1993 |
title_full_unstemmed |
Acoustic estimates of 0-group fish abundance in the Barents Sea and adjacent waters in 1992 and 1993 |
title_sort |
acoustic estimates of 0-group fish abundance in the barents sea and adjacent waters in 1992 and 1993 |
publishDate |
1995 |
url |
http://hdl.handle.net/11250/107696 |
geographic |
Barents Sea Bergen |
geographic_facet |
Barents Sea Bergen |
genre |
Barents Sea polar cod |
genre_facet |
Barents Sea polar cod |
op_source |
s. 187-197 |
op_relation |
PINRO-IMR Symposium 6 http://hdl.handle.net/11250/107696 |
_version_ |
1766370116636770304 |