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Seasonal and Annual Variations in the Catches of Crangon crangon (L., 1758) (Decapoda, Natantia) near the Coast of Texel, the Netherlands

D. H. Spaargaren
Crustaceana
Vol. 73, No. 5 (Jun., 2000), pp. 547-563
Published by: Brill
Stable URL: http://www.jstor.org/stable/20106318
Page Count: 17
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Seasonal and Annual Variations in the Catches of Crangon crangon (L., 1758) (Decapoda, Natantia) near the Coast of Texel, the Netherlands
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Abstract

From 1960 onward up to the present day, a net, placed in the harbour of the Netherlands Institute for Sea Research ('t Horntje) at the southeastern point of the island of Texel, was emptied at regular intervals (several times a week), and the contents sorted according to species. The number of animals caught gives an impression of seasonal and annual fluctuations in the occurrence (or activity) of the various species near 't Horntje. This paper reports on the seasonal and year-to-year fluctuations as observed for the common shrimp, Crangon crangon. An attempt is made to explain the long term, annual variations in terms of fluctuations in abiotic conditions. The individual catches of C. crangon near 't Horntje appear to be strongly dependent on day length. Annual fluctuations in salinity and temperature can explain the long-term variations in C. crangon catches to a large extent. /// Depuis 1960 jusqu'à aujourd'hui, un filet, placé dans le port de l'Institut Néerlandais pour la Recherche de la Mer ('t Horntje) à la pointe sud-est de l'île de Texel, a été vidé à intervalles réguliers (plusieurs fois par semaine), et le contenu trié par espèce. Le nombre d'animaux capturés donne l'impression de fluctuations dans la présence (ou l'activité) saisonnières et annuelles des diverses espèces près de 't Horntje. Cet article traite des fluctuations saisonnières et d'année en année, telles qu'elles ont été observées chez la crevette grise, Crangon crangon. On essaie d'expliquer les variations annuelles en termes de fluctuations des conditions abiotiques. Les prises individuelles de C. crangon près de 't Horntje semblent être fortement dépendantes de la longueur du jour. Les fluctuations annuelles dans la salinité et la température peuvent expliquer dans une large mesure les variations à long terme dans les captures de C. crangon.

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