Evaluation of sustainable utilization of fishery resources in the Eastern Indian Ocean based on the mean trophic level

Lu Quan; Su Xue; Fang Zhou; Chen Xinjun

doi:10.12284/hyxb2021104

Volume 43 Issue 8

Aug. 2021

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Lu Quan，Su Xue，Fang Zhou, et al. Evaluation of sustainable utilization of fishery resources in the Eastern Indian Ocean based on the mean trophic level[J]. Haiyang Xuebao，2021, 43(8)：118–127 doi: 10.12284/hyxb2021104

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Evaluation of sustainable utilization of fishery resources in the Eastern Indian Ocean based on the mean trophic level

doi: 10.12284/hyxb2021104

Lu Quan^{1, 2
,},
Su Xue¹,
Fang Zhou^{1, 3, 4, 5, 6},
Chen Xinjun^{1, 3, 4, 5, 6
,
,}

1.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
2.
Fisheries Bureau, Ministry of Agriculture and Rural Affairs of the People’s Republic of China, Beijing 100125, China
3.
The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China
4.
National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China
5.
Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China
6.
Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China

Received Date: 2021-02-07
Rev Recd Date: 2021-02-24

Available Online: 2021-04-30

Publish Date: 2021-08-25

Abstract

Abstract

The sustainable utilization of fishery resources is the basis of resources exploitation. Based on the statistical data of catches in the East Indian Ocean from 1950 to 2018 provided by the food and agriculture organization of the united nations, and combined with the trophic level (TL) of relevant fish species provided by Fishbase, the changes of mean trophic level (MTL) and fishing-in-balance (FiB) index of catch in the East Indian Ocean during 69 years, so as to determine the sustainable utilization of fishery resources in the Eastern Indian Ocean were discussed in this paper. The results showed that the catches in the East Indian Ocean showed a steady increasing trend from 1950 to 2018. The catches of Tenualosa ilisha, Clupea pallasi and Rastrelliger kanagurta were the important catch species in the East Indian Ocean from 1950 to 2018, and their cumulative annual yield accounted for more than 10% of the total catch. The variation of MTL could be divided into three stages: from 1950 to 1974, the MTL was high and its value range was 3.39−3.71 with the average of 3.60±0.07, the annual catch showed a steady increase trend, the average annual growth rate was 6.4%; from 1975 to 1999 the annual MTL fluctuated from 3.21 to 3.51 with an average of 3.35±0.08, the annual catch showed a small and steady increase trend, the average annual growth rate was 4.8%; during 2000 to 2018, the annual MTL from 2000 to 2018 was 3.31−3.43, with an average of 3.38±0.03, and the annual catch showed a slow and steady increasing trend, with an average annual growth rate of 1.6%. The mean FiB index of the three stages was 0.59±0.22, 0.94±0.14 and 1.25±0.04, respectively. The value of FiB index showed a steady increasing trend and the range of annual variation was smaller, which indicated that the community structure in the East Indian Ocean was becoming more and more stable. The degree of development and utilization of fishery resources increased, while the decline in MTL was small, and the FiB index showed an upward trend, indicating that the increase in fish catches could make up for the decrease of MTL; and when only populations with TL greater than 3.25 were counted, the average MTL values of 1950−1974, 1975−1999, and 2000−2018 were 4.16±0.04, 4.18±0.04, and 4.19±0.03, respectively, showing a small and stable increase trend, indicating that the fishery resources of the high-trophic population were not damaged. It is concluded that the marine ecosystem of East Indian Ocean is stable and the fishery resources are under-exploited.
- Eastern Indian Ocean,
- fishery catch,
- mean trophic level,
- fishing-in-balance index,
- sustainable utilization evaluation

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