Ecotypic variation and predatory behavior among killer whales off the eastern Aleutian Islands, Alaska Craig O. Matkin Abstract–From 2001 to 2004 in the eastern Aleutian Islands, Alaska, killer whales (Orcinus orca) were encountered 250 times during 421 days of surveys that covered a total of 22,491 miles. Three killer whale groups (resident, transient, and offshore) […]
Category: Fishery Bulletin
Swimming depth, ambient water temperature preference, and feeding frequency of young Pacific bluefin tuna determined with archival tags – Thunnus orientalis Tomoyuki Itoh Abstract–We investigated the migration and behavior of young Pacific bluefin tuna (Thunnus orientalis) using archival tags. The archival tag measures environmental variables, records them in its memory, and estimates daily geographical locations […]
Capture probability of a survey trawl for red king crab Kenneth L. Weinberg Abstract–The relative abundance of Bristol Bay red king crab (Paralithodes camtschaticus) is estimated each year for stock assessment by using catch-per-swept-area data collected on the Alaska Fisheries Science Center’s annual eastern Bering Sea bottom trawl survey. To estimate survey trawl capture efficiency […]
A sudden collapse in distribution of Pacific sardine off southwestern Australia enables an objective re-assessment of biomass estimates Daniel J. Gaughan Abstract–Fishery-independent estimates of spawning biomass ([B.sub.SP]) of the Pacific sardine (Sardinops sagax) on the south and lower west coasts of Western Australia (WA) were obtained periodically between 1991 and 1999 by using the daily […]
Use of parasites in stock identification of the deepwater redfish in the Northwest Atlantic – Sebastes mentella David J. Marcogliese An important aspect of fisheries management is the correct delineation of boundaries between fish stocks. With the recent collapse of the groundfish fishery in eastern Canada, redfish (Sebastes spp.) has become an increasingly important resource. […]
Year-class formation in Pacific herring estimated from spawning-date distributions of juveniles in San Francisco Bay, California Michael R. O’Farrell Abstract–Inter and intra-annual variation in year-class strength was analyzed for San Francisco Bay Pacific herring (Clupea pallasi) by using otoliths of juveniles. Juvenile herring were collected from March through June in 1999 and 2000 and otoliths […]
Larval and settlement periods of the northern searobin and the striped searobin – Prionotus carolinus – P. evolans – Statistical Data Included Richard S. McBride Abstract–This study reports new information about searobin (Prionotus spp.) early life history from samples collected with a Tucker trawl (for planktonic stages) and a beam trawl (for newly settled fish) […]
Tracking Pacific bluefin tuna in the northeastern Pacific with an automated algorithm that estimates latitude by matching sea-surface-temperature data from satellites with temperature data from tags on fish Michael L. Domeier Abstract–Data recovered from 11 popup satellite archival tags and 3 surgically implanted archival tags were used to analyze the movement patterns of juvenile northern […]
Temporal variation in growth of yellowfin tuna larvae in the Panama Bight, 1990-97 Jeanne B. Wexler Abstract–Tuna larvae (at flexion, postflexion, and transformation stages) were collected by dip net and light traps at night in the northwestern Panama Bight during the season of reduced upwelling (June-September) of 1990, 1991, 1992, and 1997. The larvae were […]
Sizes of walleye pollock consumed by the eastern stock of Steller sea lions in Southeast Alaska from 1994 to 1999 Dominic J. Tollit Abstract–Lengths of walleye pollock (Theragra chalcogramma) consumed by Steller sea lions (Eumetopias jubatus) were estimated by using allometric regressions applied to seven diagnostic cranial structures recovered from 531 scats collected in Southeast […]