Page 164 - 《水产学报》2025年第11期

徐国强，等 水产学报, 2025, 49(11): 119313

Spatial distribution characteristics of Oratosquilla oratoria and
its relationship with environmental factors in Rui'an Sea area

XU Guoqiang , XU Kaida , WANG Haoxue , ZHOU Yongdong *
Key Laboratory of Sustainable Utilization of Technology Research for Fishery Resource of Zhejiang Province,
Scientific Observing and Experimental Station of Fishery Resources for Key Fishing Grounds,
Ministry of Agriculture and Rural Affairs, Zhejiang Marine Fisheries Research Institute, Zhoushan 316021, China

Abstract: This study aimed to investigate the spatial distribution characteristics of Oratosquilla oratoria in the Rui'an Sea area
across different seasons and their relationship with environmental factors. Based on bottom trawl surveys conducted in April
(spring), August (summer), November (autumn) 2021, and January (winter) 2022, we analyzed the relative importance index,
spatial distribution, center of gravity variations, and seasonal variations in the body mass of O. oratoria. Furthermore, a GAM
model was applied to identify the key environmental factors affecting its density distribution. The results showed that O. ora-
toria was the dominant species in four seasons in the Rui'an Sea area, and are important benthic species in the Rui'an Sea area.
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The average resource density of O. oratoria in Rui'an Sea area was 115.00 kg/km throughout the year, and the average
resource density of O. oratoria showed that winter > autumn > summer > spring, and there was no significant difference in the
resource density of O. oratoria in all seasons. O. oratoria were distributed in the waters east of Beiji Island at a depth of 20 m
in spring and winter, and in the waters adjacent to Beilongshan, Beiji Island and Nanji Island in summer and autumn; the center
of gravity of the density of resources showed a tendency to move toward the nearshore from spring to autumn, and to move
toward the offshore from autumn to winter. The average body mass of O. oratoria was spring > summer > autumn = winter,
and there was no significant difference in the body mass of O. oratoria between seasons. The GAM model showed that longit-
ude, water depth, surface water temperature and bottom water temperature showed highly significant effects on the density of
O. oratoria resources. O. oratoria showed a highly significant linear relationship with water depth, and a highly significant non-
linear relationship with longitude, surface water temperature and bottom water temperature. The results show that the adjacent
waters of Beiji Island may be an important place for spawning and larval fattening of O. oratoria in Rui'an Sea area. Longitude,
depth and water temperature are important factors affecting the resource density distribution of O. oratoria in Rui'an Sea area.
This study reveals the dynamic change pattern of O. oratoria resources in Rui'an Sea area, which provides a reference basis for
rational utilization and protection of O. oratoria resources.

Key words: Oratosquilla oratoria; spatial distribution; environmental factors; GAM model; Rui'an Sea area
Corresponding author: ZHOU Yongdong. E-mail: zyd511@126.com
Funding projects: National Key R & D Program of China (2019YFD0901204); Dynamic Monitoring Survey of Fishery
Resources in Zhejiang Fisheries (HYS-CZ-202314); Rui'an Sea Fishery Resources Background Survey and Evaluation of the
Effectiveness of Enhancement and Stocking Project (01042006)

https://www.china-fishery.cn 中国水产学会主办 sponsored by China Society of Fisheries
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