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Abstract
Report of the Workshop on Implementation of Stock Reproductive Potential into Assessment and Management Advice for Harvested Marine Species
Highlights
Scientific Council established the Working Group on Reproductive Potential followed a recommendation of the Symposium on “Variations in Maturation, Growth, Condition and Spawning Stock Biomass Production in Groundfish” hosted by NAFO Scientific Council from 9–11 September 1998, Lisbon, Portugal
If there is little or no trend in reproductive biology since these factors are all estimated with some error, the addition of these to our estimates of population size will likely just increase the error with which these estimates are made and we will not ‘do better’
It is clear that the incorporation of more complex indices of Stock Reproductive Potential (SRP) can make a difference in the perception of stock status
Summary
Scientific Council established the Working Group on Reproductive Potential followed a recommendation of the Symposium on “Variations in Maturation, Growth, Condition and Spawning Stock Biomass Production in Groundfish” hosted by NAFO Scientific Council from 9–11 September 1998, Lisbon, Portugal. For many ICES stocks a constant maturity at age key is applied to estimate SSB In this presentation options for estimating total egg production and the implications of spawning time are discussed in relation to the SRP of North Sea haddock (Melanogrammus aegelfinus). It is important to take account of age related differences in maturity, relative fecundity and survival probability in estimating changes in stock reproductive potential. This group structured their discussions around a series of questions. Sex ratio to model growth separately in case of sexual dimorphic species
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