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Study on Variation of Fish Community Structure in Poyang Lake Channel in Summer and Autumn and the Otolith and Growth of Juvenile Domestic Chinese Carps

Author: ZhuQiGuang
Tutor: WuZhiQiang；LiuHuanZhang
School: Nanchang University
Course: Aquaculture
Keywords: Poyang Lake Four fish Japanese round Grow Juveniles Community structure
CLC: S917.4
Type: Master's thesis
Year: 2011
Downloads: 73
Quote: 0
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Abstract


Poyang Lake is a typical throughput type , seasonal freshwater lakes, the Yangtze River as the only one of the two large lakes Tongjiang , Poyang Lake in the Yangtze four fish fattening juvenile has an important significance. Currently, about four fish fingerlings into the Yangtze River Poyang related issues remain unclear , but through the river channel on Poyang Lake fish study reported relatively scarce. In this paper, June 2010 through October lake river channel fish survey data for the study, research Poyang Lake Road through the summer and autumn river fish community structure changes and four fish fingerlings into the lake pattern, and into the lake juvenile fish as experimental materials , observe the otolith microstructure research otolith age and growth of juvenile fish . The main results are as follows: 1.2010 July-October through the river channel Poyang catch survey investigated a total of 50 kinds of fish species , belonging to 8 families and 39 genera, of which a maximum of cyprinids , representing the number of fish species 64%. Fish diversity index to the new pool from Hukou Township, showed an increasing trend . 2.2010 four fish fingerlings into the Poyang Lake, the earliest time for the June 26 , the peak concentration in late July and mid-August . Estimate the entire river channel through four fish during the investigation of juvenile production was 3.1 × 106 tail. Which accounted for 78.75% of silver carp , grass carp accounted for 18.43 percent , bighead carp and black carp , respectively, 2.06% and 0.76% . 3 According to analysis of otolith day round , grass carp fingerlings age range of 45-79d, the average age was 65.9 ± 7.1d; herring juvenile age range of 53-95d, the average age was 78.1 ± 10.8d; silver carp fingerlings age range of 43-102d, the average age was 62.4 ± 8.1d; bighead carp fingerlings age range of 51-93d, an average of 70.9 ± 10.5d. 4 four fish fingerlings short otolith radius and body length was a significant linear relationship with body weight showed a significant exponential relationship . 5 Four fish juvenile body length and weight growth comply linear growth model or exponential model ; weight uniform growth .

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CLC: > Agricultural Sciences > Aquaculture, fisheries > Aquatic basic science > Aquatic Biology > Aquatic Zoology
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