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- W1986937301 abstract "Fish body size, a key driver of many aspects of fish population biology and ecology, is affected by fisheries that deplete the largest individuals. Rockfish (genus Sebastes) are a diverse group that has been heavily fished on the U.S. West Coast in recent decades. We examined trawl survey data from 1980 to 2001 to determine spatial and temporal trends in body size and density of 16 shelf rockfish species, including six that are considered overfished. Mean individual mass and maximum observed mass declined in the majority of species in one or more zoogeographic regions between central California and Washington. Density changes were far more variable in time and space, but in all regions, density declines were most often associated with large-bodied rockfish. We next estimated the impact of size and density changes on energy consumption and fecundity in a five-species rockfish assemblage that includes bocaccio (S. paucispinis), a large-bodied, overfished species. Indexes of both consumption and fecundity by the assemblage increased in the southern portion of the study area between 1980 and 2001 but decreased in the northern portion. Allocation of energy and reproductive potential within the assemblage shifted dramatically: relative to bocaccio, total energy consumption and fecundity indexes for the other four species increased by orders of magnitude from 1980 to 2001. These changes in community structure may affect the ability of bocaccio and other large rockfish species to recover from overfishing, especially in light of long-term declines in zooplankton production that may also be affecting rockfish size and production. Addressing these issues may require a regional, multispecies management approach." @default.
- W1986937301 created "2016-06-24" @default.
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- W1986937301 date "2006-08-01" @default.
- W1986937301 modified "2023-10-02" @default.
- W1986937301 title "CHANGES IN BODY SIZE, ABUNDANCE, AND ENERGY ALLOCATION IN ROCKFISH ASSEMBLAGES OF THE NORTHEAST PACIFIC" @default.
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- W1986937301 doi "https://doi.org/10.1890/1051-0761(2006)016[1502:cibsaa]2.0.co;2" @default.
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