Subsampling multi-species trawl catches from tropical northern Australia: Does it matter which part of the catch is sampled?

Heales, D. S., Brewer, D. T., & Wang, Y-G. (2000) Subsampling multi-species trawl catches from tropical northern Australia: Does it matter which part of the catch is sampled? Fisheries Research, 48(2), pp. 117-126.

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Abstract

Subsampling is a common method for estimating the abundance of species in trawl catches. However, the accuracy of subsampling in representing the total catch has not been assessed. To estimate one possible source of bias due to subsampling, we tested whether the position on trawler sorting trays from which subsamples were taken affected their ability to represent species in catches. This was done by sorting catches into 10 kg subsamples and comparing subsamples taken from different positions on the sorting tray. Comparisons were made after species were grouped into three categories of abundance, either 'rare', 'common' or 'abundant'. A generalised linear model analysis showed that taking subsamples from different positions on the sorting tray had no major effect on estimating the total numbers or weights of fish or invertebrates, or the total number of fish or invertebrate taxa, recorded in each position. Some individual taxa showed differences between positions on the sorting tray (11.5% of taxa ina three-position design; 25% in a five-position design). But consistent and meaningful patterns in the position of these taxa on the sorting tray could only be seen for the pony fish Leiognathus moretoniensis and the saucer scallop Amusium pleuronectes. Because most bycatch laxa are well mixed throughout the catch, subsamples can be taken from any position on trawler sorting trays without introducing bias.

Impact and interest:

10 citations in Scopus
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11 citations in Web of Science®

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ID Code: 90609
Item Type: Journal Article
Refereed: Yes
Additional Information: ISI Document Delivery No.: 343YY
Times Cited: 9
Cited Reference Count: 10
Heales, DS Brewer, DT Wang, YG
Elsevier science bv
Amsterdam
Keywords: subsampling, bycatch, northern prawn fishery, tropical, prawn crawling, shrimp trawling, fish
DOI: 10.1016/s0165-7836(00)00182-x
ISSN: 0165-7836
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2000 Elsevier Science B.V.
Deposited On: 20 Nov 2015 04:18
Last Modified: 20 Nov 2015 04:18

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