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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 33, No. 3, 2012, pp. 255-260
Bioline Code: zr12039
Full paper language: English
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 33, No. 3, 2012, pp. 255-260

 en Distribution and changes in species composition and abundance of ichthyoplankton in the Yangtze estuary
ZHANG, Heng; YANG, Sheng-Long & MENG, Hai-Xing

Abstract

Based on four surveys of eggs and larvae in the Yangtze estuary in 2005 (April and November) and 2006 (April and September), combined with the historical data of the wetland in 1990 (September) and 1991 (March), we analyzed seasonal changes in fish species composition and quantity of ichthyoplankton. Thirty-six species of egg and larvae were collected and marine fish species were the highest represented ecological guild. Average fish species and average abundance in spring were lower than in autumn for every survey. The total number of eggs in brackish water was higher than in fresh water, but the total number of larvae and juveniles in brackish water was lower. The abundance of eggs and larvae during from 2005 to 2006 in both spring and autumn was higher compared to those from 1990 to 1991. Obvious differences in species composition in September between 1990 and 2006 were found, especially for Erythroculter ilishaeformis check for this species in other resources and Neosalanx taihuensis check for this species in other resources . Fish species composition and quantity within the ichthyoplankton community has obviously changed in the Yangtze estuary over the last 20 years.

Keywords
Yangtze estuary; Egg ; Larvae; Species composition; Annual change

 
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