Use of stereo camera systems for assessment of rockfish abundance in untrawlable areas and for recording pollock behavior during midwater trawls

Williams, Kresimir and Rooper, Christopher N. and Towler, Rick (2010) Use of stereo camera systems for assessment of rockfish abundance in untrawlable areas and for recording pollock behavior during midwater trawls. Fishery Bulletin, 108(3), pp. 352-362.

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Official URL: http://fishbull.noaa.gov/1083/williams.pdf

Abstract

We describe the application of two types of stereo camera systems in fisheries research, including the design, calibration, analysis techniques, and precision of the data obtained with these systems. The first is a stereo video system deployed by using a quick-responding winch with a live feed to provide species- and size- composition data adequate to produce acoustically based biomass estimates of rockfish. This system was tested on the eastern Bering Sea slope where rockfish were measured. Rockfish sizes were similar to those sampled with a bottom trawl and the relative error in multiple measurements of the same rockfish in multiple still-frame images was small. Measurement errors of up to 5.5% were found on a calibration target of known size. The second system consisted of a pair of still-image digital cameras mounted inside a midwater trawl. Processing of the stereo images allowed fish length, fish orientation in relation to the camera platform, and relative distance of the fish to the trawl netting to be determined. The video system was useful for surveying fish in Alaska, but it could also be used broadly in other situations where it is difficult to obtain species-composition or size-composition information. Likewise, the still-image system could be used for fisheries research to obtain data on size, position, and orientation of fish.

Item Type: Article
Title: Use of stereo camera systems for assessment of rockfish abundance in untrawlable areas and for recording pollock behavior during midwater trawls
Personal Creator/Author:
CreatorsEmail
Williams, Kresimir
Rooper, Christopher N.
Towler, Rick
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 108
Number: 3
Page Range: pp. 352-362
Date: 2010
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8750
Depositing User: Patti M. Marraro
Date Deposited: 11 Jun 2012 18:33
Last Modified: 11 Jun 2012 18:33
URI: http://aquaticcommons.org/id/eprint/8750

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