SPAM (Sex-Structured Pandalus Assessment Model): a stock assessment model for Pandalus stocks
نویسندگان
چکیده
22 Despite the economic importance of Pandalus shrimp fisheries, few analytical tools have been 23 developed to assess their stocks and traditional stock assessment models are not appropriate 24 because of biological specificities of Pandalus species. In this context, we propose SPAM, a 25 model dedicated to protandric hermaphrodite Pandalids stock assessment. Pandalids are difficult 26 to assess because the cues affecting sex-change, size at recruitment and mortality variability are 27 not well understood or characterized. The novel structure of the model makes it possible to 28 adequately describe variability in natural mortality by stage and in time, as well as variability in 29 size at sex-change and recruitment. The model provides traditional stock assessment outputs 30 such as fishing mortality estimates, numbers of individuals, and provides in addition yearly 31 natural mortality estimates. The model is applied to the exploited shrimp stock of Pandalus 32 borealis in Sept-Îles as an illustrative example of the utility of the approach. 33 Author-produced version of the article published in Canadian Journal of Fisheries and Aquatic Sciences, 2012, 69(4), 770-783 The original publication is available at http://www.nrcresearchpress.com/toc/cjfas/69/4 doi : 10.1139/f2012-011
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