Abstract :
The installation of a complex electronic scanning sonar in a fishery research vessel is described. It includes a versatile hydraulically-operated stable platform to which the electroacoustic transducer is attached. Problems of electrical and acoustic noise are discussed in relation to detection ranges. Applications include fish detection and fish behaviour studies, observations of trawls both in midwater and on the seabed, detection and classification of wrecks, and studies of sand waves and other seabed features, including detailed survey of gravel extraction.
