The paper presents the results of marine testing of a digital holographic module for recording and measuring zooplankton. The tests based on the use of measuring-technological platform earlier developed at IO RAS were performed in summer 2016 in the Kara Sea during cruise 66 of the R/V Akademik Mstislav Keldysh. The upper water layer was sensed down to the 240 m horizon, which resulted in successful recording of about 100 Gb of digital holographic frames with reference to continuous depth profiles of electric conductivity in situ. Tests conducted under summer Arctic sea conditions confirmed the validity of the technical solutions. Based on the results, a list of upgrades to the holographic module was compiled for successful implementation of the latter in ocean research.
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