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Session 5. FIS Topic Session
Oceanographic and demographic processes affecting the reproductive biology of exploited marine stocks

Co-Convenors: Jin-Yeong Kim (Korea), Paul Spencer (U.S.A.) and Chang Ik Zhang (Korea)

Recent research has demonstrated several complexities in the reproductive processes of marine fish. First, for some cod and rockfish stocks there is evidence of a maternal effect upon larval quality such that larval viability increases with spawner age. Second, some iteroparous stocks show evidence of skipped spawning (i.e., not all mature fish spawn in each year) that is related to environmental conditions and the life-history of the stock. Third, temporal changes in age at reproduction have occurred for some exploited stocks, and researchers are attempting to attribute this pattern to some combination of (1) demographic changes in age and size structure; (2) plastic responses to a changing environment; or (3) evolutionary responses to selective pressures. These complexities indicate that the production of reproductive output of marine stocks may be more complex than typically assumed in population models, and researchers are beginning to more fully incorporate reproductive biology in assessment procedures. The purpose of this session is to review field, laboratory, and modeling studies that may reveal how oceanographic variability, life-history pattern, and fishing pressure may affect the reproductive biology for North Pacific fish stocks, and consider how reproductive biology can best be incorporated into fishery assessment and management.

Wednesday, October 27, 2010

Edward A. Trippel (Invited)
Demography, degrees and development of scientific advice for fisheries management
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Doug Hay, Megan Moody, Bruce McCarter and Thomas W. Therriault
Is climate change responsible for changes in the distribution, abundance and spawning of the anadromous eulachon (Thaleichthys pacificus) in the North Pacific? A synthesis of available information (S5-6722)
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Edward D. Weber and Sam McClatchie
Effect of water-mass properties on the spawning location of Pacific Mackerel Scomber japonicus in the California Current (S5-6802)
(pdf, 0.5 Mb)


Steven J. Parker and Paul Grimes
Oogenesis in Antarctic toothfish and implications for fisheries management (S5-6497)
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You Jung Kwon, Chang Ik Zhang and Hyeok Chan Kwon
Estimation of biological parameters for rock bream, Oplegnathus fasciatus, in Jeju marine ranching area of Korea (S5-6613)
(waiting for permission)


Cindy J.G. van Damme, Mark Dickey-Collas, Olav S. Kjesbu and Adriaan D. Rijnsdorp
Fecundity regulation mechanisms in fish with different spawning strategies (S5-6536)
(pdf, 0.3 Mb)


Edward J. Dick
Modeling the reproductive potential of rockfishes (Sebastes spp.) (S5-6683)
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Joel B. Webb, Laura M. Slater, Ginny L. Eckert and Gordon H. Kruse
Variability in reproductive potential of eastern Bering Sea snow crab, Chionoecetes opilio,
demographic and environmental effects (S5-6474)
(waiting for permission)
Peng Sun, Zhenlin Liang, Wei Yan and Huaming Yu
Chief cause for the change of fish phenotypic traits: Fishing gear selectivity (S5-6451)
(pdf, 1.3 Mb)
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