ESTIMATES OF TOTAL ZOOPLANKTON IN THE ZANZIBAR AREA OF THE INDIAN OCEAN WITH A COMPARISON OF THE RESULTS WITH TWO DIFFERENT NETS

Authors


*The Laboratory, Citadel Hill, Plymouth, England.

Abstract

Total plankton from vertical samples is estimated in terms of numbers, volume and dry weight per m3. Three stations were sampled, by day and by night, over a period of thirteen months, using both a 58 m.p.i. and a 74 m.p.i. net clamped together. Three stations had total depths of 12, 40 and 750 m respectively. Some relevant and contemporary climatic and hydrographic factors are shown. The relative catches of the two nets are shown for all three measures and their relative catching ability is discussed.

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