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Norwegian stratified-random bottom trawl surveys are carried out under the assumption that a constant area is swept by the trawl during a standard haul to generate abundance indices. Results from measurements of trawl geometry during a trawl survey in the Svalbard area, showed that there was a consi...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.611.1437 2023-05-15T18:29:38+02:00 and Olav Rune Gode Arill Engas The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.611.1437 http://journal.nafo.int/j09/godo.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.611.1437 http://journal.nafo.int/j09/godo.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://journal.nafo.int/j09/godo.pdf 1981 Halliday 1986). Swept area abundance indices text ftciteseerx 2016-01-08T14:30:56Z Norwegian stratified-random bottom trawl surveys are carried out under the assumption that a constant area is swept by the trawl during a standard haul to generate abundance indices. Results from measurements of trawl geometry during a trawl survey in the Svalbard area, showed that there was a considerable depth dependency, and to a lesser extent, area/bottom stratum depen-dency of wingspread. Assuming that the swept area was linearly related to the wingspread, it was found that the currently applied method relatively underestimates the younger ages of cod (1-3 years) in the Svalbard area. The use of instruments for monitoring trawl geometry during all tows is one way to diminish variability in bottom trawl survey indices. Text Svalbard Unknown Halliday ENVELOPE(-128.617,-128.617,54.476,54.476) Svalbard |
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English |
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1981 Halliday 1986). Swept area abundance indices |
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1981 Halliday 1986). Swept area abundance indices Olav Rune Gode Arill Engas and |
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1981 Halliday 1986). Swept area abundance indices |
description |
Norwegian stratified-random bottom trawl surveys are carried out under the assumption that a constant area is swept by the trawl during a standard haul to generate abundance indices. Results from measurements of trawl geometry during a trawl survey in the Svalbard area, showed that there was a considerable depth dependency, and to a lesser extent, area/bottom stratum depen-dency of wingspread. Assuming that the swept area was linearly related to the wingspread, it was found that the currently applied method relatively underestimates the younger ages of cod (1-3 years) in the Svalbard area. The use of instruments for monitoring trawl geometry during all tows is one way to diminish variability in bottom trawl survey indices. |
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The Pennsylvania State University CiteSeerX Archives |
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Text |
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Olav Rune Gode Arill Engas |
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Olav Rune Gode Arill Engas |
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Olav Rune Gode |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.611.1437 http://journal.nafo.int/j09/godo.pdf |
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ENVELOPE(-128.617,-128.617,54.476,54.476) |
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Halliday Svalbard |
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Halliday Svalbard |
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Svalbard |
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Svalbard |
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http://journal.nafo.int/j09/godo.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.611.1437 http://journal.nafo.int/j09/godo.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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