Page 79 - 《渔业研究》2025年第3期

336 渔 业 研 究 第 47 卷

Estimation of shrimp and crab aquaculture capacity in seawater ponds
based on nitrogen and phosphorus loads

2
1,2
2*
HAN Changjiang ，HUANG Yaling ，GAO Yuan ，MU Jingli 2*
(1. College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
2. Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, College of Geography and
Oceanography, Minjiang University, Fuzhou 350108, China)

Abstract: [Objective] From the perspective of ecological and environmental protection, combined with the
current status investigation, based on the total phosphorus (TP) load, total nitrogen (TN) load and tail water dis-
charge standards, two models were used to estimate the annual aquaculture capacity and density capacity of
Litopenaeus vannamei and Portunus trituberculatus in seawater ponds. [Methods] In this study, the seawater
ponds in the restricted area of Daguanban industrial and urban sea area (Guanban Town area) were used as the
research area. Based on TP load and TN load models, the aquaculture capacity of L. vannamei and P. tritubercu-
latus in two breeding stages within one year was estimated, and the maximum aquaculture capacity in the area
was determined based on the minimum value estimated by the two models. [Results] The estimation results
based on TP load showed that the maximum aquaculture capacity and density capacity of L. vannamei in the
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first culture stage (from March to June) were 588 t and 1.31 t/hm , respectively; the maximum aquaculture capa-
city and density capacity of P. trituberculatus in the second culture stage (from June to February of the next
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year) were 714 t and 1.59 t/hm , respectively. Based on the estimation results of TN load, the maximum
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aquaculture capacity and density capacity of L. vannamei in the first stage were 415 t and 0.93 t/hm , respectively;
the maximum aquaculture capacity and density capacity of P. trituberculatus in the second culture stage were
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356 t and 0.79 t/hm , respectively. By comparing the aquaculture capacity based on TP and TN load estimations,
the minimum value was used to determine the maximum aquaculture capacity of L. vannamei and P. tritubercu-
latus in the study area. The recommended values of L. vannamei and P. trituberculatus were 415 t and 356 t, re-
2
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spectively, and density capacities of which were 0.93 t/hm and 0.79 t/hm , respectively. [Conclusion] In this
study, the aquaculture capacity based on TP load estimation is significantly higher than that based on TN load
estimation, and the aquaculture capacity is generally low, which is closely related to the requirements of influ-
ent and effluent quality and emission standards in aquaculture ponds. From the perspective of environmental
protection, the key is to increase the self-purification capacity of water bodies, thereby increasing environment-
al aquaculture capacity. Therefore, it is suggested to improve the aquaculture capacity and density capacity
of the region by enhancing training and awareness campaigns, improving the replacement rate of compound
feed, exploring multi-trophic level breeding methods, improving self-purification capacity, implementing ecolo-
gical and environmental protection measures, and reducing pollutant emissions, so as to help the green and high-
quality development of aquaculture.
Key words: nitrogen and phosphorus loads; Litopenaeus vannamei; Portunus trituberculatus; aquaculture capacity