中国水产科学2025，Vol.32Issue(8)：1149-1163,15.DOI:10.12264/JFSC2025-0044
长江口仔稚鱼多样性与时空分布及其相关环境因素
Diversity and spatio-temporal distribution of larval and juvenile fishes and associated environmental factors in the Yangtze River Estuary
摘要
Abstract
This study investigated the recovery of fish resources after a fishing ban in the Yangtze River and the influence of tides on the distribution of larval and juvenile fishes.From July 2022 to May 2023,42 sampling stations were set up in the Acipenser sinensis natural reserve and adjacent waters of the Yangtze River estuary.Sampling was conducted with a larval net(diameter 1.3 m,mesh 0.5 mm)that was towed at the surface layer in different seasons during flood and ebb tide.A total of 336 nets were trawled,and 89644 larval and juvenile fishes comprising 81 species,23 families,and 20 orders were collected.The average density was 0.59 ind/m3.Engraulidae was the most dominant family,accounting for 82.13%of the total catch.The density of larval and juvenile fishes was the highest in summer,reaching 1.77 ind/m3,followed by spring(0.45 ind/m3)and autumn(0.12 ind/m3),and it was lowest in winter(0.002 ind/m3).The distribution of larval and juvenile fishes in a single season was not influenced by tides except in spring.Moreover,the density of larval and juvenile fishes in summer was higher in the north branch than in the south branch and the lowest in the reserve.In autumn,larval and juvenile fishes were more abundant in the south branch than in the reserve,with the lowest abundance in the north branch.In spring,larval and juvenile fishes were more abundant in the reserve than in the south branch during the flood tide,with the lowest abundance in the north branch.However,the abundance in the north branch was greater than that in the reserve during ebb tide.The density of larval and juvenile fishes was higher during flood tide than ebb tide,except in spring.The richness index(D)and diversity index(H')were both highest in summer,followed by spring,lower in autumn,and lowest in winter.However,the evenness index(J')was lower in summer than in spring.CCA analysis of water temperature,salinity,pH,and dissolved oxygen showed that salinity was significantly correlated with the distribution of larval and juvenile fishes during the whole seasons,while other environmental factors were correlated with the distribution of larval and juvenile fishes only during flood or ebb tide in several seasons.关键词
长江口/中华鲟/自然保护区/仔稚鱼/种类组成/环境因子Key words
Yangtze River Estuary/Acipenser sinensis/natural reserve/larval and juvenile fishes/species composition/environmental factors分类
水产学引用本文复制引用
陆天宇,赵度宾,陈锦辉,刘企昂,王晓东,魏广恩,邱哲文,钟俊生,林军..长江口仔稚鱼多样性与时空分布及其相关环境因素[J].中国水产科学,2025,32(8):1149-1163,15.基金项目
上海市水生野生动植物保护研究中心项目(D-8006-23-0114) （D-8006-23-0114）
上海市科委地方院校能力建设项目(23010502500). （23010502500）
