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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
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, more
Peer reviewed article  

Available in  Authors 

Keywords
    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]
    ANE, Baltic [Marine Regions]
    Marine/Coastal

Authors  Top 
  • Hinrichsen, H.-H.
  • Möllmann, C.
  • Voss, R., more
  • Köster, F.W.
  • Kornilovs, G.

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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