Research Document - 2005/019
Calculation of Northern Gulf of St. Lawrence cod (Gadus morhua) natural mortality for the 1990 to 2004 period
By Grégoire, F., A. Fréchet
Abstract
Sequential population analysis was used to calculate natural mortality of the northern Gulf of St. Lawrence cod (Gadus morhua) in NAFO Divisions 3Pn,4RS. Calculations were made using the ADAPT software for periods ranging between 4 and 9 years. The diagnosis and results of these analyses are similar from one model to the other and according to the basic formulation used for the abundance assessment. Results also suggest a gradual drop in natural mortality during the 1990s and 2000s.
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