用于渔业资源调查评估的两种声学手段的比较

采用数字回声探测仪Bio Sonics DT-X(430 KHz)和双频识别声呐DIDSON(低频1.1 MHz、高频1.8MHz)对青草沙水库的渔业资源量、空间分布特征等进行了为期2 d的水声学调查。在调查过程中两种仪器同步工作,并采用放网捕捞的方法对青草沙水库中的鱼类样本进行采集,并测量其体重与体长。利用Echoview软件对两种仪器采集所得的声学数据进行分析处理。DIDSON的调查结果显示:水库鱼类总数约为936万尾,总的资源量约为705万kg,鱼类主要分布于水库的东部、中部地区。Bio Sonics DT-X的调查结果显示:水库鱼类总数约为1 079万尾,总的资源量约为604.24万kg,鱼类主要分布于水库的东北部地区。

Comparison of two acoustic methods for fishery resource survey and evaluation

An acoustic survey was carried out for 2 days using a digital echo sounder BioSonics DT-X(430 kHz) and a DIDSON (Low-frequency 1.1 MHz, High-frequency 1.8 MHz) together to assess the fishery resources in Qingcaosha reservoir, 2016.In the process of investigation, the two instruments were synchronized.In the meantime, the fish samples in Qingcaosha reservoir were collected by net harvesting and then be measured.Acoustic data acquired by these two instru-ments were analyzed by Echoview.The results of DIDSON showed that the total number of fish reservoirs was about 9.36 million tails, the total amount of resources is about 7.05 million kilogram.The fishes was mainly located in the eastern and central areas of the reservoir.The results of BioSonics DT-X showed that the total number of fish reservoirs is about 10.79 million tails, and the total resources are about 6.042 4 million kilogram, and fishes was mainly distributed in the northeast of the reservoir.