Swept area variation with depth and its influence on stratified trawl surveys indices on Arcto-Norwegian cod
Stratified trawl surveys have been carried out in the Barents Sea and the Svalbard areas since 1981. Based on the assumption of a constant area swept by the trawl during a standard trawl haul at any depth, swept area abundance indices have been presented for both areas. The results have been used in...
Main Authors: | , |
---|---|
Format: | Report |
Language: | English |
Published: |
ICES
1986
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/104141 |
Summary: | Stratified trawl surveys have been carried out in the Barents Sea and the Svalbard areas since 1981. Based on the assumption of a constant area swept by the trawl during a standard trawl haul at any depth, swept area abundance indices have been presented for both areas. The results have been used in the management of the Arcto-Norwegian cod stock. In this paper results from measurements of trawl geometry during trawling operation during a standard stratified trawl survey in the Svalbard area in September-October 1985 are presented and the implication on the trawl indices of these results are discussed. |
---|