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His work led to the development of instruments for in situ observation of underwater fauna, including the ecoSCOPE and the first software for full speed video processing. Later work at Kiel included the study of predator-prey interactions of juvenile herring and plankton, for which a floating laboratory was built called ATOLL.
Kils, U. (1987) "Verhaltensphysiologische Untersuchungen an pelagischen Schwärmen - Schwarmbildung als Strategie zur Orientierung in Umwelt-Gradienten. Bedeutung der Schwarmbildung in der Aquakultur", (Habilitation), Universität Kiel, Ber Inst Meereskunde, Kiel 163: 1-168.