Spatial and temporal distribution characteristics and analysis of influ-encing factors of fish larvae and juveniles along the coast of Minnan fishing grounds
To identify the composition and diversity of fish larvae and juveniles in the coastal waters of the Minnan fishing grounds,the species composition and quantity distribution of fish larvae and juveniles,as well as the relationship between the hydrological characteristics of the waters of the fishing grounds in Minnan and the distribution of fish larvae and juveniles,were studied.Ecological research data were obtained for the larvae and juveniles studied in four voyages carried out in May 2022(spring),November 2022(autumn),February 2023(winter),and July 2023(summer).It was found that:(1)a total of 1114 fish larvae and juveniles were collected on 4 voyages,belonging to 9 orders,40 families,and 87 species,of which the number of Perciformes was the largest,accounting for 65.26％of the total number of fish larvae and juveniles in the study area.The abundance of fish larvae and juveniles and the number of species were the highest in summer,and the abundance of fish larvae and juveniles and the number of species were the lowest in autumn.The dominant species in each quarter were obvious,and there were no common dominant species.(2)There are significant differences in the composition of the fish larvae and juvenile clusters in the Minnan fishing grounds.The species replacement rates in the four seasons were 88.46％,98.15％,100.00％,and 92.11％,respectively.The results of the diversity analysis show that the richness index(D)and the Shannon-Wiener diversity index(H')were the highest in the summer,but the Pielou evenness index(J')was highest in the winter.(3)Analysis of the similarity of the assemblages of fish larvae and juveniles showed that the assemblages of fish larvae and juveniles in spring,summer,and winter were obvious.During spring,fish larvae and juveniles can be divided into two groups:nearshore and offshore.In summer and winter,the fish larvae and juveniles can be divided into three groups:the nearshore group,the offshore group I,and the offshore group Ⅱ.(4)Analysis of the correlation between spatial and temporal distribution and environmental factors of the fish larvae and juveniles revealed that the changes in salinity between different stations and the temperature changes between seasons are the main factors that affect spatial and temporal distribution.The results of this study provide a scientific basis for studying the replenishment mechanism of fishery resources in the Minnan fishing grounds and formulating measures for the conservation and management of fishery resources.
fish larvae and juvenilesspecies compositionspatial and temporal distributionMinnan fish groundsenvironmental factor
国家科技期刊平台
NSTL
万方数据
