中国水产科学2025，Vol.32Issue(12)：1836-1844,9.DOI:10.12264/JFSC2025-0124
大黄鱼肠道真鲷长颈棘头虫季节动态
Seasonal dynamics of Longicollum pagrosomi(Yamaguti,1935)in the intestines of large yellow croaker(Larimichthys crocea)
摘要
Abstract
Acanthocephalans are important intestinal parasitic helminths of the large yellow croaker(Larimichthys crocea),and their infections can be detrimental to host growth and health.In this study,we systematically assessed seasonal infection dynamics and their association with host biological traits to enhance understanding of epidemiological characteristics and host-parasite interactions.Specifically,we aimed to elucidate prevalence patterns and establish a scientific basis for disease prevention and control.Accordingly,we conducted a year-long survey on L.crocea cultured in Sanduao Bay,Ningde,Fujian Province.The results showed that Longicollum pagrosomi(Yamaguti,1935)displayed an aggregated distribution within the host population.Infection significantly reduced host condition factor(P<0.05),indicating that parasitism-induced physiological stress may impair host growth,reproduction,and disease resistance.Temporal analysis revealed significant monthly variations in L.pagrosomi prevalence(P<0.05),with maximum prevalence in August(90.0％)and minimum in September(18.2％).Mean intensity was highest in June(9.0)and lowest in December and March(1.0),indicating infections were concentrated in summer(June-August).These seasonal fluctuations are likely driven by environmental factors,such as water temperature,as elevated summer temperatures may accelerate the parasite life cycle and enhance transmission efficiency.Ontogenetic analysis showed prevalence increased with host body length,reaching a maximum in the 35-40 cm group(F,66.7％),likely due to increased food intake and prolonged exposure in larger individuals.In contrast,mean intensity followed a bell-shaped pattern,peaking in the 25-30 cm group(D,7.1),potentially reflecting dietary shifts during host development.A significant positive correlation was detected between L.pagrosomi abundance and host body length(r=0.25,P=0.004).Collectively,these findings demonstrate distinct seasonal and ontogenetic patterns in L.pagrosomi infection,establishing a scientific basis for targeted aquaculture management strategies,including intensified monitoring during summer and among specific size classes.This study advances understanding of marine parasite ecology by highlighting the roles of both abiotic(e.g.,temperature)and biotic(e.g.,host size)factors in shaping infection dynamics.Future research should elucidate the molecular mechanisms underlying host-parasite interactions across seasons and developmental stages and assess the effects of environmental change on these patterns.关键词
大黄鱼/真鲷长颈棘头虫/感染率/平均感染强度/季节动态Key words
Larimichthys crocea/Longicollum pagrosomi/prevalence/mean intensity/seasonal dynamics分类
农业科技引用本文复制引用
王艳杰,严小军,江丽华,朱登辉,陶震,徐胜威,金霄,付佩佩..大黄鱼肠道真鲷长颈棘头虫季节动态[J].中国水产科学,2025,32(12):1836-1844,9.基金项目
国家重点研发计划项目(2023YFD2401905) （2023YFD2401905）
国家自然科学基金专项基金项目(32173020) （32173020）
舟山渔业育种育苗科创中心项目(2025Y001) （2025Y001）
浙江海洋大学2024年度研究生教育质量系列工程项目. （）
