Efficiences Comparees de Filets A Plancton Coniques de Memes Dimensions et de Mailles Differentes II. Selectivite de la Maille N 000 Pour Les Amphipodes et les Copepodes

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Abstract
During a cruise in tropical waters of the Pacific Ocean, oblique plankton hauls with a special gear, designed with two nets on the same frame, were made on the RV “Coriolis” of the Centre ORSTOM of NOUMEA (New Caledonia). One of the nets was fitted with nylon gauze N° 000 (mesh aperture 0.91 mm) and the other with a fine mesh of N° 2 grade (0.34 mm). A comparative study deals with Amphipods and Copepods of the two catches. Selection lengths for the gauze N° 000 are determined. A considerable escapement through this filtering material takes place and the samples lose a great part of their representative and non-selective properties. Examination of the N° 2 mesh shows a sufficient retention of the Amphipods and an acceptable sampling of the calanoid Copepods. Nevertheless, a smaller mesh size (0.28 mm) is suggested for the Copepods as a whole.

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