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Ontogenetic patterns and temperature-dependent growth rates in early life stages of Pacific cod (Gadus macrocephalus) Public Deposited

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  • Pacific cod (Gadus macrocephalus) is an important component of fisheries and food webs in the North Pacific Ocean and Bering Sea. However, vital rates of early life stages of this species have yet to be described in detail. We determined the thermal sensitivity of growth rates of embryos, pref lexion and postf lexion larvae, and postsettlement juveniles. Growth rates (length and mass) at each ontogenetic stage were measured in three replicate tanks at four to five temperatures. Nonlinear regression was used to obtain parameters for independent stage-specific growth functions and a unified size- and temperature- dependent growth function. Specific growth rates increased with temperature at all stages and generally decreased with increases in body size. However, these analyses revealed a departure from a strict size-based allometry in growth patterns, as reduced growth rates were observed among pref lexion larvae: the reduction in specific growth rate between embryos and free-swimming larvae was greater than expected based on body size differences. Growth reductions in the preflexion larvae appear to be associated with increased metabolic rates and the transition from endogenous to exogenous feeding. In future studies, experiments should be integrated across life transitions to more clearly define intrinsic ontogenetic and size-dependent growth patterns because these are critical for evaluations of spatial and temporal variation in habitat quality.
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  • Hurst, T. P., Laurel, B. J., & Ciannelli, L. (2010, June 8). Ontogenetic patterns and temperature-dependent growth rates in early life stages of Pacific cod (Gadus macrocephalus). Fishery Bulletin, 108(4), 382-392.
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  • This research was supported in part by a grant from the North Pacific Research Board (no. R0605). This is publication no. 248 of the North Pacific Research Board.
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  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2011-10-13T22:11:44Z (GMT) No. of bitstreams: 1 CiannelliLorenzo.COAS.OntogeneticPatternsTemp-dep.pdf: 1026285 bytes, checksum: 3dcd52162d821e02f56e5e40d941042d (MD5)
  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2011-09-21T15:17:49Z No. of bitstreams: 1 CiannelliLorenzo.COAS.OntogeneticPatternsTemp-dep.pdf: 1026285 bytes, checksum: 3dcd52162d821e02f56e5e40d941042d (MD5)
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