Le traîneau suprabenthique MACER‐GIROQ : appareil amélioré pour l'échantillonnage quantitatif étagé de la petite faune nageuse an voisinage du fond The MACER‐GIROQ Suprabenthic Sled: An Improved Device for Quantitative Two‐level Sampling of the Small Swimming Fauna near the Bottom

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Abstract
Enlarged versions of the MACER sled‐mounted suprabenthic sampler were tested, improved, calibrated and used extensively (598 tows) at depths of 10—384 m since 1968 in the Gulf and Estuary of the St. Lawrence. Two half‐metre zooplankton nets are mounted at 28—64 and 106—142 cm from the sea‐bed, on a steel chassis and toboggan plate. Each has a flow‐meter and 3 horizontal shutters which open via a lever upon contact with the sea floor. They close automatically, through springs and water pressure, whenever the sled leaves the bottom, ensuring uncontaminated suprabenthic samples. Although heavy (228 kg), the device is sturdy, used like a beam trawl, reliable, and collects very little sediment. It has been used to study micro‐stratification above bottom. Data on filtered water volumes, special problems encountered and future improvements are discussed.

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