Hierarchical analysis of a remote, Arctic, artisanal longline fishery

Susan T. Dennard, M. Aaron MacNeil, Margaret A. Treble, Steven Campana, Aaron T. Fisk

Rannsóknarafurð: Framlag til fræðitímaritsGreinritrýni

15 Tilvitnanir (Scopus)


This is the first paper to explore trends in catch per unit effort (cpue) through time of a Greenland halibut Reinhardtius hippoglossoides stock targeted by an artisanal, winter fishery in Cumberland Sound on southern Baffin Island, Canada. We modelled cpue data from 1987 to 2003, looking at two questions: what factors have driven cpue trends, and is cpue an accurate index of a stock's abundance? In the context of limited data availability, we used generalized linear models (GLMs) and hierarchical models to assess important predictors of cpue. Hierarchical models with multiple fixed environmental effects contained fishing location or individual fisher as random effects. A month effect showed greatest catch rates during February and March; the monthly North Atlantic Oscillation index was positively associated with catch rates; and a change from decreasing to increasing cpue after 1996 was linked to reduced fishery participation following a large storm. The best Akaike's information criterion-ranked GLM identified a negative relationship of cpue with shark bycatch. Although data limitations precluded conventional stock assessment, our models implicated the environment and fisher behaviour as drivers of cpue trends. Additionally, using multiple hierarchical models to predict cpue provided a more informative analysis for understanding trends in cpue than a GLM alone.

Upprunalegt tungumálEnska
Síður (frá-til)41-51
FræðitímaritICES Journal of Marine Science
Númer tölublaðs1
ÚtgáfustaðaÚtgefið - jan. 2010


Funding Information:
We thank the fishers of Pangnirtung for keeping records of their catch, and the Pangnirtung Hunters and Trappers Association for provision of and permission to use the logbooks. We also thank Alice Grhicak-Mannion for creating Cumberland Sound maps and helping us prepare for fieldwork. We also acknowledge NOAA for hosting us for several weeks at the Panama City Laboratory. Additionally, we appreciate the reviewers’ feedback and suggestions that helped improve and polish the manuscript. The study was funded by the Government of Canada International Polar Year Programme (Project CC144).


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