Report of the Second Workshop on Redfish and Oceanographic Conditions (WKREDOCE 2)

• Main Author: ICES (11907872)
• Format: Report
• Language: unknown
• Published: 2012
• Subjects: Ecosystem observation; processes and dynamics; Fisheries and aquaculture; WKRDOCE; CM 2012/ACOM; oceanographic conditions; redfish; Canada; Faroe Islands; Greenland; Irminger Basin; Irminger Sea; Northwest Atlantic Mid-Ocean Channel; Iceland; Northeast Atlantic; Northwest Atlantic
• Online Access: https://doi.org/10.17895/ices.pub.19281683.v1

The Workshop on Redfish and Oceanographic Conditions (WKREDOCE) was established as a response to a request for advice from NEAFC (Northeast Atlantic Fisheries Commission) to ICES. The objective of the workshop is to analyze the distribution of pelagic redfish in the Irminger Sea and adjacent waters in relation to environmental changes. The establishing meeting, held in September 2011 and chaired by Kristján Kristinsson (Iceland) identified possible data sources and set the objectives to address the ToR (Section 1.5). It was also agreed that the preliminary analysis should proceed by correspondence between workshop participants and include experts from each lab. Intersessionally, data sources were identified and preliminary analyses were car-ried out. The present meeting, attended by ten participants from Canada, the Faroe Islands, Greenland, Germany, Iceland, Netherlands and Russia reviewed the data and two preliminary analyses examining redfish distribution in relation to its environment, one on a seasonal scale, the other interannually. An annual index analysis of SPG intensity, water temperature in relation to the position of the S. mentella centre of mass (centroid) indicates that an intensification in the SPG together with the corresponding temperature increase in the north-eastern Irminger Sea appears to result in an interannual displacement of S. mentella south-westwards to more cold and fresh waters. Based on fishery data, in April–July, the densest and most stable aggregations are generally distributed in the northern part of the Irminger Sea in vertically averaged temperature ranging from 4.3 to 7.7°С, in Atlantic water advected by the Irminger Current. In August-September, the densest concentrations of S. mentella are found in shallower layers, in southern Irminger Basin and northwest Atlantic mid-ocean channel, in the modified Atlantic waters in 3.4–6.7°С. The results at the seasonal and interannual time scale are concordant, such that the SPG increases intensity towards autumn and winter, ...