RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2018, Vol. 27 >> Issue (01): 76-.doi: 10.11870/cjlyzyyhj201801015

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Differences and Association of Larval and Juvenile Fish Community in #br# Surf Zone of South Branch of Yangtze River and the Adjacent Waters

MAO Chengze1,2, CHEN Yuange3, ZHONG Junsheng4, HUA Weihua1,2, JIAO Xinming1,2, ZHANG Xiaoyu1,2, YUAN Guangwang1,2   

  1.  （1.Tidal Flat Research Center of Jiangsu Province, Nanjing 210036, China; 2.Jiangsu Marine Environment Monitoring and Forecasting Center, Nanjing 210036, China; 3.Key and Open Laboratory of Marine and Estuary Fisheries Minister of Agriculture of China, East China Sea Fisheries Research Institute，Chinese Academy of Fisheries Sciences，Shanghai 200090,China; 4.College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China）
  • Online:2018-01-20

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Abstract: In order to identify the difference and relationship of the larval and juvenile fish in surf zone in south branch of Yangtze River Estuary and the adjacent waters. Monthly field works were conducted in surf zone in south branch of Yangtze River Estuary(SYE), north Hangzhou Bay(NHB)(from Aug 2009 to Aug 2010) and Si Jiao Island(SJI)(from Aug 2010 to Aug 2011). Fishes were collected by small trawls(1 m × 4 m, 1mm mesh size), each site sampling was repeated three times. Water temperature and salinity were also measured in the sampling periods. Samples were fixed in 5% formalin solutions in the fields and moved to lab for further analysis. All fish species were identified, measured and counted by stereomicroscope in lab. The result showed that there were 40 species(in 11 families) at SYE; 59 species(in 23 families) at NHB, and 46 species(in 28 families) at SJI, in which 7 species could be found at all above 3 sties. The dominant populations at SYE, NHB and SJI were migration fish, estuarine fish and marine fishes, respectively. The highest Catch Per Unit Effort(CPUE) at SYE, NHB and SJI were 203.62 ind./haul, 112.80 ind./haul and 53.67 ind./haul, respectively. The predominant fish populations at the three sites were different one by one. Postflexion and juveniles fishes are predominant populations at Hangzhou Bay(NHB) and Si Jiao Island(SJI), respectively; and the four development stages fishes equally distributed at Yangtze River Estuary(SYE). The diversity index was highest at NHB(2.19) and lowest at SJI(1.75). The greatest fish diversities at the three sites all occurred in August, whereas the highest CPUE at the three sites existed in August, September and May, respectively. The only species that existed at all three sites, Lateolabrax maculates, reach the 3 water areas in different months and development stages. The three areas are all involved on Lateolabrax maculates migration routes to upriver waters.
Key words：South Branch of Yangtze Estuary; adjacent waters; surf zone; larval and juvenile fishes; community; differences and association

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