水生生物学报2024，Vol.48Issue(12)：2029-2041,13.DOI:10.7541/2024.2024.0169
基于水声学和渔获物调查的洱海鱼类资源时空分布特征
SPATIAL-TEMPORAL DISTRIBUTION CHARACTERISTICS OF FISH RESOURCES IN ERHAI LAKE BASED ON HYDROACOUSTICS AND CATCH SURVEY METHODS
摘要
Abstract
Erhai Lake,the second largest plateau freshwater lake in Yunnan Province,is known for its unique fish resources.In order to understand the temporal and spatial dynamics of fish resources,we evaluated the community structure and spatial-temporal distribution of fish in Erhai Lake by using hydroacoustics and catch survey methods from 2022 to 2023 this study.Additionally,the relationship anmong fish community structure,fish distribution characteris-tics,and environmental factors was analyzed.A total of 22 fish species were identified in the fishery survey,belonging to 17 genera,8 families,and 4 orders,with Rhinogobius giurinus being the dominant species.The hydroacoustic survey results showed that the TS value of fish mainly ranged from-70 to-58 dB(total length 1.2-5.0 cm)in four seasons,accounting for 88.40%,83.03%,84.53%,and 82.92%in summer,autumn,winter,and spring,respectively.The ave-rage target intensity of fish in summer,autumn,winter,and spring were(-59.08±0.08)dB,(-54.99±0.15)dB,(-55.90±0.16)dB,and(-58.07±0.18)dB,respectively.Fish densities were as follows:(23851.61±889.30)ind./ha in summer,(14185.69±1106.54)ind./ha in autumn,(2423.19±179.54)ind./ha in winter,and(3382.16±440.71)ind./ha in spring.Spatially,fish in summer and spring were primarily concentrated in the northern region.Vertically,a higher proportion of fish were found in the 2.5-6.5 m water layer during summer,autumn,and spring,accounting for 32.99%,30.65%,and 62.78%,respectively,whereas in winter,34.05%of the fish were found in the 14.5-18.5 m water layer.Significant vertical migration was observed in winter and spring.Redundancy analysis(RDA)showed that water temperature(WT),ammonia nitrogen(NH3-N),transparency(SD),and high salinity index(CODMn)signifi-cantly affected the distribution of small fish in Erhai Lake.This study demonstrates the feasibility of combining acous-tic surveys with catch surveys to investigate the spatial and temporal distribution of fish resources.The results provide a scientific basis for the protection and restoration of fish resources in Erhai Lake.关键词
水声学/鱼类群落结构/时空分布/洱海Key words
Hydroacoustics/Community structure/Spatial and temporal distribution/Erhai Lake分类
农业科技引用本文复制引用
张航,梁智策,匡晨亿,周婷,廖传松,苑晶,郭传波,刘家寿..基于水声学和渔获物调查的洱海鱼类资源时空分布特征[J].水生生物学报,2024,48(12):2029-2041,13.基金项目
国家重点研发计划(2023YFD2400900) （2023YFD2400900）
洱海生态调查项目(4532900HT202200026)资助[Supported by the National Key R&D Program of China(2023YFD2400900) （4532900HT202200026）
Erhai Ecological Survey Project(4532900HT202200026)] （4532900HT202200026）
