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• W46442453 abstract "During 1991-95, up to 60% of the annual catch of Pacific hake (Merluccius productus) in the U.S. management zone was harvested by a U.S.-based fleet of factory trawlers. Optimal foraging theory was used to motivate a statistical analysis of movement patterns of these vessels. This study focused on the mesoscale characteristics of the environment (5-50 km), and vessel movement at these spatial scales. Geostatistical analyses of hake densities derived from the 1992 and 1995 National Marine Fisheries Service assessment surveys with quantitative echo-sounding techniques showed that strong spatial correlations of hake density do not extend beyond -25-35 km. The range of Pacific hake spatial correlation suggests an association with mesoscale oceanographc features whose characteristic scale in the California Current system is determined by the Rossby radius of deformation (-25 km in mid-latitudes off the West Coast). The foraging patterns of factory trawlers can be described as a series of moves between trawling locations. The distance between successive hauls depends on whether the vessel continues fishing within a local area of high fish density, or moves to a different area. Generalized additive models (GAM) were used to examine influence of the catch rates of prior hauls on the distance between successive hauls. The GAM models suggested that deviations from the expected catch rate influence the decision to move from a local foraging area, as expected from optimization models of animal foraging. These decisions appeared to be based on relatively short time frames, such that information from only the most recent one or two hauls in the area is used. In addition, results indicated that the presence of other fishing vessels operating nearby reduces the probability that a vessel will leave an area." @default.
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• W46442453 date "1997-01-01" @default.
• W46442453 modified "2023-09-26" @default.
• W46442453 title "MESOSCALE FISHING PATTERNS OF FACTORY TRAWLERS IN THE PACIFIC HAKE (MERLUCCIUS PRODUCTUS) FISHERY" @default.
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