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Hydrodynamic properties of some pelagic Crustacea from the North-Equatorial gulfstream
Spaargaren, D.H. (1980). Hydrodynamic properties of some pelagic Crustacea from the North-Equatorial gulfstream. Interne verslagen Nederlands Instituut voor Onderzoek der Zee, 1980(2). NIOZ: Texel. 11 pp.
Deel van: Interne verslagen Nederlands Instituut voor Onderzoek der Zee. Nederlands Insituut voor Onderzoek der Zee. , meer

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  • Spaargaren, D.H.

Abstract
    Measurements on underwater weight, weight in air and terminal sinking rate were collected using 8 different species of pelagic Crustacea from the North-Equatorial Gulfstream. From these data (1) animal density, (2) shape constant, determining frictional resistance at terminal sinking velocity and (3) an estimate for the minimum power requirement for keeping depth were derived. Densities varied between 1.036-1.1112 g.ml-1; shape constants ranged between 465 and 1280; power demand (per gram) ranged between 4.5 and 24 µWatt/gram fresh weight. In species found at different localities a clear intraspecific variation of density and shape constant is observed; by the contribution of the exoskeleton to the density of crustaceans, density and shape constant are positively related. The relatively low densities correspond to the pelagic modes of life; the low shape constants, which do not contribute very much to reduce the energy consumption for keeping depth, are probably related to a high mobility in these species, whereas large protrusions would inhibit their locomotion.

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