Chris R. Lunsford

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Pacific sleeper sharks Somniosus pacificus were captured near Steller sea lion Eumetopias jubatus rookeries during the period when Steller sea lion pups are most vulnerable to Pacific sleeper shark predation (first water entrance and weaning). Analysis of stomach contents revealed that teleosts were the dominant prey in August and cephalopods were the(More)
uses the NOAA Technical Memorandum series to issue informal scientific and technical publications when complete formal review and editorial processing are not appropriate or feasible. Documents within this series reflect sound professional work and may be referenced in the formal scientific and technical literature. ABSTRACT Accurate catch estimates are(More)
In nature, populations are sometimes distributed in a patchy, rare, or aggre-gated manner. Conventional sampling designs such as simple random sampling (SRS) do not take advantage of this spatial differentiation. Thompson (1990) introduced a sampling design called adaptive cluster sampling (ACS) to survey these types of distributions. Adaptive cluster(More)
Relative to last year's assessment, we made the following substantive changes in the current assessment. Input data: Relative abundance and length data from the 2002 longline survey, relative abundance and length data from the 2001 longline fishery, and age data from the 2001 longline survey and longline fishery were added to the assessment model. Recent(More)
Fishing, farming and ranching provide opportunities for predators to prey on resources concentrated by humans, a behavior termed depredation. In the Gulf of Alaska, observations of sperm whales depredating on fish caught on demersal longline gear dates back to the 1970s, with reported incidents increasing in the mid-1990s. Sperm whale depredation provides(More)
Executive Summary Summary of major changes Relative to last year's assessment, we made the following substantive changes in the current assessment. Input data: Relative abundance and length data from the 2007 longline survey, relative abundance and length data from the 2006 longline and trawl fisheries, and age data from the 2006 longline survey and(More)
3.0 Executive Summary 3.0.1 Summary of major changes Relative to last year's assessment, we made the following substantive changes in the current assessment. Model changes: The model has been reconfigured as a split-sex model and now incorporates Gulf of Alaska trawl survey lengths and biomass estimates for depths 500 meters and less. Input data: Relative(More)