Biomass and distribution of carangoid fish resources in the offshore South China Sea

ZHANG Jun; ZHANG Peng; CHEN Zuozhi; CHEN Guobao; ZHANG Kui; XU Youwei; SUN Mingshuai

doi:10.3969/j.issn.2095-0780.2016.04.005

Volume 12 Issue 4

Aug. 2016

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South China Fisheries Science > 2016 > 12(4): 38-48. > DOI: 10.3969/j.issn.2095-0780.2016.04.005

ZHANG Jun, ZHANG Peng, CHEN Zuozhi, CHEN Guobao, ZHANG Kui, XU Youwei, SUN Mingshuai. Biomass and distribution of carangoid fish resources in the offshore South China Sea[J]. South China Fisheries Science, 2016, 12(4): 38-48. DOI: 10.3969/j.issn.2095-0780.2016.04.005

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Biomass and distribution of carangoid fish resources in the offshore South China Sea

Key Lab. of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture; Scientific Observing and Experimental Station of South China Sea Fishery Resources & Environments, Ministry of Agriculture; South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China

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Received Date: March 01, 2016
Revised Date: May 09, 2016

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Abstract

In order to identify the biomass and distribution of carangoid fish resources in the offshore South China Sea, four acoustical surveys were conducted using scientific echosounder (Simrad EY60) with light falling-net fishing in the middle south area (6°N~17°N) of the open South China Sea (autumn 2012, spring 2013) and north area (17°N~22°N) of the offshore South China Sea (spring 2015, autumn 2015). On the basis of determining the effectiveness of the method, the survey results show that the biomass of carangoid fish resources was 4.13×10⁵ t and 3.49×10⁵ t in the south-central area in autumn 2012 and in spring 2013, and the high density area were both 15°N transect. In the north area, the biomass of carangoid fish resources was 2.03×10⁵ t in spring 2015 and the high density area was 18.50°N~19.50°N, 113.00°E ~116.00°E, but that biomass was only 0.59×10⁵ t in autumn 2015. The species composition of carangoid fish presented significant seasonal difference, and Decapterus macarellus and D.macrosoma were the most important economic carangoid species; the biomass density of carangoid fish resources in the south-central area in autumn 2012 was significantly higher than that in the north area in autumn 2015 (P < 0.01, t-test), but was not significantly different with that in spring 2013 (P>0.05, t-test); the difference of the biomass density was not significant between the south-central area in spring 2013 and the north area in spring 2015 (P>0.05, t-test), but the biomass density in the north area in spring 2015 was significantly higher than that in autumn 2015 (P < 0.01, t-test).
- carangoid fish,
- light-falling net,
- fishery resource,
- acoustical estimation,
- the offshore South China Sea

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