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Methods of assessing the amount of ultraplankton in the surface waters of the sea are discussed with particular reference to their use on board ship. A fluorometric technique for the determination of the amount of chlorophyll a produced by the ultraplankton is described, together with a method for estimating the relative amounts of net-plankton and ultraplankton. It is shown that in the Barents Sea, and some other northern waters, the ultraplankton may at times contribute over 90% of the total chlorophyll a in the water.
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Natasha Reynolds (1973) studied this question.
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