The application of acoustic method in fishery resources survey

The development of the acoustic method in fishery resources survey at home and abroad, the basic principles, apparatus, and the main working process were described in this paper. Emphasis is placed on the acoustic survey, which includes survey design, acoustic instrument calibration, survey data collection, fish target strength determination, echogram scrutinizing, data processing and fish biomass estimation. Finally, it discussed the bottlenecks and pitfalls in the current application of acoustic survey, such as integral data allot and noninvestigating species interfering. Integral data allot was mainly determined by sample collecting and its constitute, the echo signal and echogram could be interfered by some other species who existed in different levels of ocean. These problems can only be resolved after fishery scientists data processing and echogram scrutinizing at the basis of contrast and research of the fish distribution, then it brought forward the prospect of acoustic survey development.