Great Lakes prey fish populations: a cross-basin overview of status and trends based on bottom trawl surveys, 1978-2013

2014 ◽  
Keyword(s):  
Great Lakes ◽  
Bottom Trawl ◽  
Fish Populations ◽  
Prey Fish ◽  
Status And Trends ◽  
Trawl Surveys

Improving area swept estimates from bottom trawl surveys

2011 ◽  
Vol 110 (1) ◽  
pp. 198-206 ◽  
Author(s):  
Stan Kotwicki ◽  
Michael H. Martin ◽  
Edward A. Laman
Keyword(s):  
Bottom Trawl ◽  
Trawl Surveys

Vertical Distribution of Fish Biomass in Lake Superior: Implications for Day Bottom Trawl Surveys

2007 ◽  
Vol 27 (3) ◽  
pp. 735-749 ◽  
Author(s):  
Jason D. Stockwell ◽  
Daniel L. Yule ◽  
Thomas R. Hrabik ◽  
Jean V. Adams ◽  
Owen T. Gorman ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Lake Superior ◽  
Bottom Trawl ◽  
Fish Biomass ◽  
Distribution Of Fish ◽  
Trawl Surveys

scholarly journals Acoustic data collected during and between bottom trawl stations: consistency and common trends

2007 ◽  
Vol 64 (1) ◽  
pp. 166-180 ◽  
Author(s):  
Nicolas Bez ◽  
David Reid ◽  
Suzanna Neville ◽  
Yves Vérin ◽  
Vidar Hjellvik ◽  
...  
Keyword(s):  
Bottom Trawl ◽  
Vertical Profiles ◽  
Spatial Structures ◽  
Acoustic Measurements ◽  
Acoustic Data ◽  
Global Indices ◽  
Abundance Estimates ◽  
Before And After ◽  
Systematic Perturbation ◽  
Trawl Surveys

Acoustic data are often collected during bottom trawl surveys. Their use can potentially improve the precision and accuracy of fish abundance estimates if acoustic data collected between trawl stations are consistent with those collected during trawling operations. This question is addressed here through the analysis of 20 bottom trawl surveys (three survey areas and five different survey series) with coincident acoustic measurements during and between trawl stations. Firstly, on-station and underway acoustic data were compared using statistics computed globally over each survey (average vertical profiles, global indices of collocations, and spatial structures) for various combinations of depth layers. Secondly, we focussed on underway acoustic data recorded in the vicinity of stations, distinguishing between data recorded before and after the tows. On-station and underway acoustic data were highly consistent, and no systematic perturbation of the acoustic sign due to the presence of the gear a few hundred metres behind the vessel was observed.

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