Abstract：To understand status and impact of the nutrient on shellfish culture in the aquaculture area at Yangma Island(N 37.5°—37.7°,E 121.5°—121.9°)(semi-enclosed bay), Yantai, Shandong province, the concentration changes, spatial distribution, and limitation characteristics of dissolved inorganic nitrogen (DIN), reactive phosphate (PO4-P), and silicate (SiO3-Si) were analyzed in the seawater at 43 stations arranged in a grid, with a water depth of 10—18 m at this area in summer cruises in August from 2019 to 2024, in accordance with the sites-sampling principle of near-shore density and far-shore sparseness, and combined with the accessibility of raft breeding areas. The results showed that there was the average DIN concentration of (7.92±5.79) μmol/L, with continuous decrease and spatial distribution pattern of gradual decrease from the nearshore to the offshore areas. The average concentration of PO4-P was found to be (0.174±0.130) μmol/L, continuous decrease and a spatial distribution pattern of lower values in the central area and high values around the periphery, thus forming a "central depression" deficiency zone in the middle of the aquaculture area. The average SiO3-Si concentration of (11.60±3.58) μmol/L was decreased gradually from the nearshore to the offshore areas. The nutrient structure was characterized by a significant PO4-P limitation, with median values of N/P ratio of 43.6 and Si/P ratio of 79.5, and the high-value zones primarily located in the central area of the aquaculture zone. Sharp declines in terrigenous nutrient inputs, and coupled with a rapid expansion of high-density farming of Pacific oysters Crassostrea gigas led to persistent nutrient depletion and a concomitant imbalance in phosphorus cycling. This dual mechanism imposes multi-pathway stress on oyster physiology, leading to reduce condition factor and to elevate mortality. The findings indicate that rational stocking-density control and scientifically quantified reductions in nitrogen and phosphorus discharge are essential for restoring the ecological integrity of aquaculture zones and for ensuring the sustainable development of mariculture.
王磊,迟守峰,王文君,李峰,汪顺周,张山. 烟台养马岛养殖区营养盐时空分布特征及影响因素[J]. 水产科学, 2026, 45(2): 227-238.
WANG Lei, CHI Shoufeng, WANG Wenjun, LI Feng, WANG Shunzhou, ZHANG Shan. Spatiotemporal Distribution Characteristics and Influencing Factors of Nutrients in Aquaculture Area at Yangma Island. Fisheries Science, 2026, 45(2): 227-238.
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2026, Vol. 45 
