Biophysical modelling of larval Baltic cod (Gadus morhua) growth and survival.

Hinrichsen, Hans-Harald, Möllmann, Christian, Voss, Rüdiger, Köster, Friedrich and Kornilovs, G. (2002) Biophysical modelling of larval Baltic cod (Gadus morhua) growth and survival. Open Access Canadian Journal of Fisheries and Aquatic Sciences, 59 . pp. 1858-1873. DOI 10.1139/F02-149.

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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.

Document Type: Article
Research affiliation: OceanRep > Leibniz-Institut für Meereswissenschaften
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1139/F02-149
ISSN: 0706-652X
Date Deposited: 18 Feb 2008 17:25
Last Modified: 29 May 2018 07:24
URI: http://oceanrep.geomar.de/id/eprint/7815

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