Geographical variation in the life history of Sebastes chrysomelas
I compared life history characteristics (growth, reproduction and lifespan) of the black and yellow rockfish, Sebastes chrysomelas, from central California (Monterey and Carmel Bays) and southern California (off Santa Barbara and Santa Cruz Island). Fish of both sexes from central California aged four and older were larger at age than fish from southern California. Central California fish were also heavier at length than fish collected in southern California. Although southern California fish matured at a smaller size than fish from central California, the age at maturity was the same for the two sites. At both sites, 100% of the males were mature by age five, and 100% of the females were mature at age six. Length and weight specific fecundity were greater for females collected in southern California, although the difference may be offset by smaller egg size in southern California. There was no apparent difference in mortality rates between the two areas. Higher water temperatures may explain the observed differences in growth between the two locations.
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| Format: | thesis biblioteca |
| Language: | English |
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San Francisco State University
1986-08
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| Subjects: | Biology, Fisheries, black-and-yellow rockfish, |
| Online Access: | http://hdl.handle.net/1834/40390 |
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