Estimating gear efficiency in a combined acoustic and trawl survey, with reference to the spatial distribution of demersal fish

21Citations
Citations of this article
56Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

Few analyses have been performed to estimate the efficiency of trawls targeting demersal fish using the ratio of catches and acoustic densities. In summer 2006, acoustic and fishing data were collected simultaneously over 3 d by three fishing vessels equipped with identical pelagic trawls in the Bay of Biscay. Variography identified moderate spatial autocorrelation in the acoustic backscatter at a mean scale of 3 km, a scale slightly smaller than the mean haul length (3.5 km), indicating that fish horizontal availability did not influence trawl efficiency. Acoustic backscattering densities expressed as nautical area scattering coefficients (NASCs) recorded in the trawled layer were compared with equivalent NASC (ENASC) values calculated from the species composition in the trawl, fish-length structure, and available relationships between target strength and fish length. Estimates of trawl efficiency for hake-dominated trawls were computed as the slopes of the relationships ENASC = 0.008 NASC and ENASC = 0.18 NASC0.31 for trawls made by day and night, respectively. For the whole demersal community, the relationships were ENASC = 0.022 NASC and ENASC = 0.17 NASC0.33 for trawls made by day and night, respectively. © 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved.

References Powered by Scopus

A consistent approach to definitions and symbols in fisheries acoustics

593Citations
N/AReaders
Get full text

A balanced view of scale in spatial statistical analysis

551Citations
N/AReaders
Get full text

Fish target strengths for use in echo integrator surveys

344Citations
N/AReaders
Get full text

Cited by Powered by Scopus

Factors affecting the availability of walleye pollock to acoustic and bottom trawl survey gear

34Citations
N/AReaders
Get full text

Combining bottom trawl and acoustic data to model acoustic dead zone correction and bottom trawl efficiency parameters for semipelagic species

33Citations
N/AReaders
Get full text

Spatial differentiation of marine eutrophication damage indicators based on species density

23Citations
N/AReaders
Get full text

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Cite

CITATION STYLE

APA

Doray, M., Mahévas, S., & Trenkel, V. M. (2010). Estimating gear efficiency in a combined acoustic and trawl survey, with reference to the spatial distribution of demersal fish. ICES Journal of Marine Science, 67(4), 668–676. https://doi.org/10.1093/icesjms/fsp277

Readers over time

‘10‘11‘12‘13‘14‘15‘16‘17‘18‘19‘20‘21‘22‘23‘24036912

Readers' Seniority

Tooltip

Researcher 23

53%

PhD / Post grad / Masters / Doc 18

42%

Professor / Associate Prof. 1

2%

Lecturer / Post doc 1

2%

Readers' Discipline

Tooltip

Agricultural and Biological Sciences 29

62%

Environmental Science 14

30%

Engineering 3

6%

Earth and Planetary Sciences 1

2%

Save time finding and organizing research with Mendeley

Sign up for free
0