Page 109 - 《水产学报》2025年第5期

冯瑞玉，等 水产学报, 2025, 49(5): 059309

Effect of stock enhancement using Ecopath model on
the ecosystem of Nanlang waters

1,3
1,2
1,3
1,3*
FENG Ruiyu , TAO Feng , GUO Yu , QIN Chuanxin ,
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SUN Jinhui , WU Yigui , WANG Jing 4
1. Key Laboratory of Marine Ranching, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute,
Chinese Academy of Fishery Sciences, Guangzhou 510300, China;
2. Tianjin Key Laboratory of Aqua-Ecology and Aquaculture, College of Fisheries,
Tianjin Agricultural University, Tianjin 300384, China;
3. Hainan Province Key Laboratory of Efficient Utilization and Processing of Deep-sea Fishery Resources,
Sanya Tropical Fisheries Research Institute, Sanya 572018, China;
4. Fangchenggang Fisheries Technology Extension Station, Fangchenggang 538001, China

Abstract: The Pearl River estuary fishery is one of China's four renowned fishery waters and is also among the most human-
impacted aquatic regions. To assess the effects of stock enhancement on the ecosystem and ecological capacity of estuarine
waters, this study utilized historical and contemporary survey data on fishery resources and ecological envrionment. A 6-year
material balance model of the Nanlang waters was constructed using Ecopath with Ecosim (ewe) 6.5 software to systematically
analyze changes in ecosystem energy flow, general characteristics, and food web structure. The results indicated that in 2005
and 2016–2020, energy flow in Nanlang waters was primarily concentrated in trophic levels Ⅰ–Ⅳ, with a consistent nutri-
tional structure. The grazing food chain and detritus food chains were the dominant energy pathways, characterized by high
energy utilization rates among primary producers but low overall energy flow conversion efficiency. The ecosystem was in a
development stage. Compared to 2005, fishery resources biomass, trophic levels, and system energy conversion efficiency
increased from 2016 to 2020. The total primary production to respiration ratio (TPP/TR) of the system gradually approached 1,
while the system connectivity index (CI) and system omnivory index (SOI) slightly rose, indicating a maturing ecosystem with
an expanding overall scale. Additionally, the ecological capacity of Lateolabrax japonicus and Acanthopagrus latus increased
by 5 and 94 times, respectively, in 2020 compared to 2005. In conclusion, stock enhancement not only enhances the stability,
complexity, and maturity of the estuarine ecosystem but also significantly improves its ecological capacity.
Key words: Ecopath moldel; stock enhancement; ecosystem; nutritional structure; ecological carrying capacity; Nanlang waters
Corresponding author: QIN Chuanxin. E-mail: qincx@scsfri.ac.cn
Funding projects: National Key R & D Program "Blue Granary Science and Technology Innovation" (2018YFD0900905);
National Natural Science Foundation of China (32160863); Innovation Team of Hainan Province (321CXTD446); Fangcheng-
gang Key R & D Program (AB21014021); Central Public-interest Scientific Institution Basal Research Fund, CAFS
(2020SY01)

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