Estimation of predation mortalities on capelin using a cod - capelin model for the Barents Sea

• Main Authors: Bogstad, Bjarte, Tjelmeland, Sigurd
• Format: Report
• Language: English
• Published: ICES 1990
• Subjects: capelin; lodde; cod; torsk; stomach data; magedata; VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452; VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923; Barents Sea
• Online Access: http://hdl.handle.net/11250/104795

The Barents Sea capelin stock collapsed during the period 1983-1986. One of the main factors causing the collapse was a rapid increase in consumption of capelin by cod. Based on measurements of stomach evacuation rates in the appropriate temperature interval and data from a combined Soviet-Norwegian stomach sampling programme, predation mortalities are calculated by a simplified version of the IMR multispecies model for the Barents Sea - MULTSPEC. Cod-capelin interaction parameters and migration parameters for capelin in MULTSPEC are also estimated. The use of the predation mortalities calculated from the multispecies model in a single-species model used for capelin management is discussed.