Abstract
The acoustic Doppler current profiler was used in Summer–Autumn 1996 and 1997 cruises of R/V bilim of Middle East Technical University to study the distribution of zooplankton in the southern Black sea. The backscattered signal intensity is compared with macro and mesozooplankton samples collected with Nansen closing net and 30-L Niskin water samplers. Analyzing the taxonomic groups and the length distribution of the individuals in the samples, size classification has been done. Total cross-sectional areas of the zooplankton in the length classes were compared with the resultant MVBS values. Highly significant correlations were observed. The relations between acoustic units and the size classes of zooplankton were presented by an empirical model which described a high percent of the total variance. The data sets from basin-wide surveys were used to obtain spatial distribution of zooplankton in the southern Black Sea. The spatial distribution of zooplankton was to a great extent determined by hydrography of the Black Sea. Daily migration patterns of zoo- plankton were studied, and the descending and ascending rates of different zooplankton groups were also calculated.
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