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Observations of sampling trawl performance made during a multi-vessel groundfish survey raised concerns that the trawls continue to fish during the retrieval period, after the end of the pre-specified sampling period but before coming off bottom. A trigonometric analysis was undertaken to estimate the distance traversed along the bottom, and the trawl speed along the seabed during the retrieval period...
A system for remotely opening and closing multiple codends on pelagic sampling trawls has been developed in Norway. The system makes it possible to take several uncontaminated samples during discrete, user-selected periods within a single trawl haul, using conventional large-scale trawl gear.The system has been used routinely to take samples of acoustically detected fish during several hydroacoustic...
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