Shu Yue, Wu Feiyu, Fang Zhou
College of Marine Living Resource Sciences and Management, Shanghai Ocean University, Shanghai 201306, China.
National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China.
Biology (Basel). 2024 Jul 10;13(7):515. doi: 10.3390/biology13070515.
The Argentine hake () is a vital fishery species in the Southwest Atlantic, recognized for its substantial economic importance. Previous studies have identified Anisakidae larvae as common parasites of . However, the nutritional relationships between these parasites and their host remain poorly understood. This study employs stable isotope techniques to investigate the specific nutritional relationships between Anisakidae larvae and different tissues of . The findings reveal notable differences in and compositions between the parasites and their host. The lower values in parasites compared to host tissues indicate the utilization of different carbon sources. The values of the parasites partially overlap with those of the host's stomach, indicating that the parasites primarily derive nutrients from the host's stomach. Nutritional niche indicators show that parasites have a broad carbon range (CR) and nitrogen range (NR), suggesting a high diversity in nutritional sources. The trophic discrimination factor (), which represents the difference in stable isotope values between host tissues and parasites, was analyzed for both and . The ΔTDFδ13C between the host liver and the parasites showed the greatest variation, indicating a strong dependence of the parasites on the liver's carbon sources. In contrast, variations in ΔTDFδ15N between host tissues and parasites were minimal. Analyzing across different stages of gonadal maturity in the host fish indicates that, as the gonads of the host fish mature, ΔTDFδ13C between host tissues and parasites significantly decreases ( < 0.01). The Kruskal-Wallis test showed significant differences in ΔTDFδ13C values among different parasite infection levels in muscle, liver, and stomach tissues, while no significant differences were found for ΔTDFδ15N values. These findings offer valuable insights into the nutritional relationships between parasites and hosts, aiding in a better understanding of the growth conditions and habitats of .
阿根廷无须鳕（）是西南大西洋一种重要的渔业物种，因其巨大的经济重要性而受到认可。此前的研究已将异尖科幼虫确定为的常见寄生虫。然而，这些寄生虫与其宿主之间的营养关系仍知之甚少。本研究采用稳定同位素技术来研究异尖科幼虫与不同组织之间的具体营养关系。研究结果揭示了寄生虫与其宿主在和组成上的显著差异。与宿主组织相比，寄生虫中较低的值表明其利用了不同的碳源。寄生虫的值与宿主胃的值部分重叠，表明寄生虫主要从宿主胃中获取营养。营养生态位指标显示，寄生虫具有广泛的碳范围（CR）和氮范围（NR），表明营养来源具有高度多样性。对和的营养级歧视因子（）进行了分析，该因子代表宿主组织与寄生虫之间稳定同位素值的差异。宿主肝脏与寄生虫之间的ΔTDFδ13C变化最大，表明寄生虫对肝脏碳源有很强的依赖性。相比之下，宿主组织与寄生虫之间的ΔTDFδ15N变化最小。对宿主鱼性腺成熟不同阶段的进行分析表明，随着宿主鱼性腺成熟，宿主组织与寄生虫之间的ΔTDFδ13C显著降低（<0.01）。Kruskal-Wallis检验显示，肌肉、肝脏和胃组织中不同寄生虫感染水平的ΔTDFδ13C值存在显著差异，而ΔTDFδ15N值未发现显著差异。这些发现为寄生虫与宿主之间的营养关系提供了有价值的见解，有助于更好地了解的生长条件和栖息地。
