Report of the Study Group on Red-fish Stocks (SGRS) ...

• Main Author: ICES
• Format: Report
• Language: unknown
• Published: ICES Expert Group reports (until 2018) 2023
• Subjects: Fisheries and aquaculture; Irminger Sea; Labrador Sea
• Online Access: https://dx.doi.org/10.17895/ices.pub.19267565; https://ices-library.figshare.com/articles/report/Report_of_the_Study_Group_on_Red-fish_Stocks_SGRS_/19267565

1. Review of the survey design of the international trawl- acoustic surveys in the Irminger Sea and adjacent waters. The methods of hydroacoustic and trawl estimation of abundance and biomass of pelagic redfish in the Irminger (and partly Labrador) Sea were reviewed under consideration of past experience, re-cent knowledge on the biology of the species and technological developments. Recommendations for the upcoming survey in June/July 2005 and for future work were developed by the Group. Especially the signal-to-noise ratios and tar-get strength models applied within the hydroacoustic measurements require fur-ther experimental work. The use of a lower transducer frequency (18 kHz) was also considered as a possibility for the estimation of redfish density below the “deep-scattering layer” (DSL). 2. Planning of the international trawl/acoustic survey of redfish in the Irminger Sea and adjacent waters in June/July 2005. Based on past experience and the suggested improvements that can already be implemented ...