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Diffusion of fish from a single release point
Sparrevohn, C.R.; Nielsen, A.; Støttrup, J.G. (2002). Diffusion of fish from a single release point. Can. J. Fish. Aquat. Sci. 59(5): 844-853
In: Canadian Journal of Fisheries and Aquatic Sciences = Journal canadien des sciences halieutiques et aquatiques. National Research Council Canada: Ottawa. ISSN 0706-652X, more
Peer reviewed article  

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Keywords
    Psetta maxima (Linnaeus, 1758) [WoRMS]; Marine

Authors  Top 
  • Sparrevohn, C.R.
  • Nielsen, A.
  • Støttrup, J.G., more

Abstract
    In a field experiment, 3529 turbot (Psetta maxima) were released in order to estimate and describe the movements of hatchery-reared fish by applying diffusion theory. After liberation, the development of the population density was estimated during the following 9 days, and from that, the rate of diffusion and the advection were determined. Two approaches were followed to describe the data: a normall distribution approximation (NDA) model and a partial differential equation (PDE) model. In the latter, it was possible to include the effect of sampling. The two models gave similar results, indicating that the sampling of fish during the experiment did not have any detectable effect on the population density. The activity of the released turbot resulted in an individual daily displacement of 151 m.day-1, except for the first 2 days at liberty, where the displacement was estimated to be considerably lower. Advection was significant and was related to the displacement of the water body. Further, it was possible to estimate the postrelease mortality as 14%.day-1 and the catchability of the turbot when caught with a young fish trawl as 28%.

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