RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2005, Vol. 14 >> Issue (6): 694-698.

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STUDIES ON BIOLOGICAL CHARACTERISTICS AND CHANGE OF RESOURCE OF COILIA NASUS SCHLEGEL IN THE LOWER REACHES OF THE YANGTZE RIVER

ZHANG Min-ying , XU Dong-po , LIU-Kai , SHI Wei-gang   

  • Received:2005-01-13 Revised:2005-05-24 Online:2005-11-20
  • Contact: ZHANG Min-ying

Abstract: Studies on biological characteristics ,change of catch per boat and maximal sustaining yield (MSY) of Coilia nasus schlegel in the lower reaches of the Yangtze River were carried out during the period from 1993 to 2002.The result showed that average bodylength and bodyweight were 29.19 cm and 94.33 g in fishing season. The correlative equation between bodylength and bodyweight could be expressed as Y= 0.004 8X2.906 9 and the coefficient of fullness was 0.379. The average value of absolute fecundity and relative fecundity were 23 695 eggs/fish and 229 eggs/g body weight respectively, and the diameter of matured egg was 0.77 mm. The correlative equation Y= 0.017 2X4.101 might be used between absolute fecundity and bodylength and it was Y= 305X-5 410.1 for absolute fecundity and bodyweight . Most of the fish were two years old in fishing season. The average value of the total catch per boat was 393.14 kg. Average annual catch was 891.51 t and MSY evaluated by model of Schaefer was 2 061.81 t in the lower reaches of the Yangtze River.Compared with historical data, the miniaturization of the fish was evident and the community age structure tended to be onefold and lowaged,at the same time ,the resource of C. nasus had decreased significantly.

Key words: lower reaches of the Yangtze River, Coilia nasus schlegel, biological characteristics, MSY

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