Study on the diel vertical migration characteristics of the deep scattering layer in the southwestern Indian Ocean

Wan Shujie; Chen Xinjun

doi:10.12284/hyxb2024016

Volume 46 Issue 1

Jan. 2024

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Wan Shujie，Chen Xinjun. Study on the diel vertical migration characteristics of the deep scattering layer in the southwestern Indian Ocean[J]. Haiyang Xuebao，2024, 46(1)：53–63 doi: 10.12284/hyxb2024016

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Study on the diel vertical migration characteristics of the deep scattering layer in the southwestern Indian Ocean

doi: 10.12284/hyxb2024016

Wan Shujie^1
,,
Chen Xinjun^{1, 2, 3, 4
,
,}

1.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
2.
Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China
3.
National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China
4.
Key Laboratory of Ocean Fisheries Exploitation, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China

Received Date: 2023-09-05
Rev Recd Date: 2023-10-18

Available Online: 2023-12-27

Publish Date: 2024-01-01

Abstract

Abstract

Based on the data from 56 acoustic survey sections in the southwestern Indian Ocean from 2011 to 2020, a total of 201 diel vertical migration were observed. The characteristics of diel vertical migration of the deep scattering layer and its spatiotemporal differences were analyzed. The research results show that the deep scattering layer in the southwestern India Ocean exhibits a stratification phenomenon, with the first scattering layer located in the shallow water layer below 200 m. The average depth of its nautical area scattering coefficient (NASC) peak is (58.66 ± 24.63) m, and there is a significant difference between summer and winter (p < 0.001); the second scattering layer is located in the water layer between 400 m and 700 m, with an average depth of (589.02 ± 66.33) m for its NASC peak. There is no significant difference between summer and winter (p = 0.51). The average time for the scattering layer to migrate upwards is 16:20, the average time for the end of migration is 18:31, and the average migration rate is (5.28 ± 1.53) cm/s; the average time for the scattering layer to start migrating downwards is 4:38, and the average time for the end of migration is 6:52. The average migration rate is (5.56 ± 2.13) cm/s. As latitude increases, the start time of downward migration become later and the migration rate slows down; as the longitude increases, the migration rate of the scattering layer also slows down, and there is a significant difference between different longitude sea areas (p < 0.001). Analysis suggests that studying the seasonal changes in the physical and chemical environment of the sea area, as well as the different life cycle stages of organisms in the scattering layer, are the main reasons for the spatiotemporal differences in the vertical structure and diurnal vertical migration characteristics of the scattering layer. They are of great significance in explaining the diurnal vertical migration behavior of tuna and indicating the distribution of tuna fishing grounds.
- deep scattering layer,
- diel vertical migration,
- spatiotemporal differences,
- southwestern Indian Ocean

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