The use of a modified Gulf V plankton sampler from a small open boat

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Abstract
The sampler is made from marine grade aluminium, is 50 cm in diameter, 213 cm long and weighs 30 kg in air when fully rigged. It has been used successfully from an 8 m Yorkshire coble in depths considerably less than 10 m as well as in greater depths. Two davits were wedged in the boat's side to carry the sampler in a position which reduced manhandling to a minimum. The warp was paid away and hauled either by a manual winch or with the aid of a crab-pot hauler. Towing speed was set by reference to the engine tachometer but the external flowmeter reading gave an accurate measure of consistency. The coefficient of variation was less than 10% of the mean. By comparison the coefficient of variation rose as high as 46 % when the sampler was towed by a 15 m keel boat.

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