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The usefulness of bottom-mounted, upward-looking sonars for long-term quantitative zooplankton monltonng was demonstrated util~zing a 49 d record of acoustic volume backscattering strengths collected by a 150 kHz RDI Acoustic Doppler Current Prof~ler in LaHave Basin off Nova Scotla, Canada Varlatlons in the character and Intensity of 2 dlstlnct acoustic scattenng honzons distlnguished by dlffenng dlurnal migration patterns were noted One honzon confined to the top 50 m and only present during the early parts of the recording was tentatively ascribed to ~uveni le fish Another strongly migrating horizon identified wlth the euphausild Meganyctlphanes norveglca was studied in detail M norvegica in daytime were broadly distnbuted at about 150 nl depth At night they were uniformly dlstnbuted in the upper 50 m A 30% decrease In nighttime integrated backscattenng levels was consistent with euphausud accumulation in the acoustically unobservable near-surface region Average target strengths decllned S1 dB dunng active vertical rmgration This observation, ~nterpreted by acoustic scattenng theory, constrained average euphausiid inclinations to llttle more than 30" dunng upward swimmng Column ~ntegrated population densities were roughly 290 m-2 Use of an lnchned beam sonar geometry should result in backscattering levels less sensitive to organism onentahon than use of a conventional verhcally onented sonar beam

Temporal variability of euphausiid concentrations in a Nova Scotia shelf basin using a bottom-mounted acoustic Doppler current profiler