Report of the Study Group on Redfish Stocks (SGRS) ...

• Main Author: ICES
• Format: Report
• Language: unknown
• Published: ICES Expert Group reports (until 2018) 2023
• Subjects: Fisheries and aquaculture; Irminger Sea; Iceland; Sebastes mentella
• Online Access: https://dx.doi.org/10.17895/ices.pub.19268393; https://ices-library.figshare.com/articles/report/Report_of_the_Study_Group_on_Redfish_Stocks_SGRS_/19268393

A trawl-acoustic survey on pelagic redfish (Sebastes mentella) in the Irminger Sea and adjacent waters was carried out by Iceland and Russia in June/July 2007. The usual participation of Germany had to be cancelled due to short-term technical problems of their vessel. The German participant, however, compensated the Russian participant by funding additional days in the field, in order to ensure the complete survey area coverage. Nearly 350 000 NM2 were covered, with only slightly increased distances between hydroacoustic tracks and trawl hauls, compared to previous surveys. As relative survey indices, a total biomass of 372 000 t was estimated at depths shallower than the “deep scattering layer” (DSL) by hydroacoustic measurements, and about 854 000 t within and deeper than the DSL by an experimental “trawl method”. In the shallower layer, the highest concentrations of redfish were found southeast of Cape Farewell and in the southwestern survey area. In the deeper layer, high concentrations were also found ...