Abstract: The acoustic surveys of fishery resources were conducted in deep-water fish reef area in marine ranching area surrounding Zhangzi Island by the Zhangzi island ship double-frequency split beam science echosounder system (SimradEK60 type, 120 kHz, 200 kHz, Norway) combined with housekeeping nets on November 12, 2016. The acoustic data collected from the survey was processed by Echoview software, and the spatial distribution and resource amount of fishery resources in and out of artificial reef area were analyzed using an echo integral method. The results showed that there were 36 species of fish, 11 species of shrimps, crabs and cephalopods, with 29 species of fish, 11 species of shrimps, crabs and cephalopods in the reef; and 24 species of fish, 9 species of shrimps, crabs and cephalopods outside the reef. In the reef area, there was average density of 0.046 ind./m2 in fish stocks, and average density of 0.033 ind./m2 out the reef area. The target objects with single target strength from -65 dB to -53 dB were mainly distributed in the shallow water layer about 20 m, and the targets with single target strength from -47 dB to -29 dB were primarily found at the deeper water layer of 30 m in the reef area. The target objects with single target strength from -65 dB to -57 dB were distributed at each water layer, and from -55 dB to -25 dB were mainly distributed in the 23-30 m water layer, and less at the lower layer out of the reef area. The findings indicated that there was 39.4% higher density of biological resources and biodiversity and 20.8% more species of animals in artificial reef area than those outside the artificial reef area, with better maintenance effect in artificial reef.
王欢欢, 毕福洋, 曹敏, 汤勇. 獐子岛海洋牧场秋季渔业资源声学调查与评估[J]. 大连海洋大学学报, 2018, 33(6): 802-807.
WANG Huan-huan, BI Fu-yang, CAO Min, TANG Yong. Survey and acoustic assessment of fishery resources in marine ranching area surrounding Zhangzi Island in autumn. Journal of Dalian Ocean University, 2018, 33(6): 802-807.
2018, Vol. 33 
