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Biophysical modeling of larval Baltic cod (Gadus morhua) growth and survival Hinrichsen, H.-H.; Möllmann, C.; Voss, R.; Köster, F.W.; Kornilovs, G. (2002). Biophysical modeling of larval Baltic cod (Gadus morhua) growth and survival. Can. J. Fish. Aquat. Sci. 59(12): 1858-1873. https://dx.doi.org/10.1139/F02-149 In: Canadian Journal of Fisheries and Aquatic Sciences = Journal canadien des sciences halieutiques et aquatiques. National Research Council Canada: Ottawa. ISSN 0706-652X; e-ISSN 1205-7533

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Trefwoorden

ANE, Baltic Developmental stages > Larvae Feeding Interspecific relationships > Predation Modelling Physics > Mechanics > Fluid mechanics > Hydrodynamics Population functions > Growth Spawning grounds Stomach content Survival Gadus morhua Linnaeus, 1758 [WoRMS]; Pseudocalanus elongatus (Brady, 1865) [WoRMS] Baltic Sea [Marine Regions] Marien/Kust

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Auteurs		Top
Hinrichsen, H.-H. Möllmann, C. Voss, R.	Köster, F.W. Kornilovs, G.

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Abstract

A coupled hydrodynamic-trophodynamic individual-based model of drift and feeding was utilized to analyze the intra- and inter-annual variability in growth and survival of cod (Gadus morhua) larvae in the central Baltic Sea. Highly temporally and spatially resolved simulated flow fields were used to investigate the potential drift of larval cod from the centre of spawning effort in the Bornholm Basin towards their nursery areas through temporally resolved three-dimensional idealized prey fields. Stomach content analyses of larval cod from the Bornholm Basin revealed calanoid copepod nauplii and early copepodite stages to be the preferred prey organisms. The results of the model runs indicate that larval cod changed from a nonlimited to a food-limited stage because of the strong decrease in abundance of the calanoid copepod Pseudocalanus elongatus during the last two decades. The modeling study revealed retention and dispersal from the main spawning ground to be a key process influencing larval survival. When P. elongatus was available in the prey fields, high cod larval survival rates occurred in spring and early summer. In contrast, when P. elongatus was not available, hatched larvae had only high survival probabilities later in the year or if they were transported into shallower coastal regions.

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