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Issue:ISSN 1000-7083
          CN 51-1193/Q
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Your Position :Home->Past Journals Catalog->2012 Vol.31 No.5

Age and Growth of Schizopygopsis malacanthus Herzenstein in the Upper Reaches of the Chin-sha River
Author of the article:HU Rui1,2,3, WANG Jian-wei1,2*, TAN De-qing1,2, MIAO Zhi-guo1,2, DAN Sheng-guo1,2
Author's Workplace:(1. Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; 2. The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Wuhan 430072, China; 3. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China)
Key Words:Schizopygopsis malacanthus Herzenstein; Chin-sha River; age; growth; otolith
Abstract:

Schizopygopsis malacanthus Herzenstein is a cold water fish endemic to the Tibetan Plateau, which distributes widely in the Chin-sha River and the Ya-lung River. In this study, age and growth of S. malacanthus in the upper reaches of the Chin-sha River were studied to provide useful information for further ecological research and resources conservation. Samples were collected from April to May and September to October in 2011. A total of 328 specimens were measured, and then annuli on lapillus were used for aging fish. The result showed that wide opaque zones and narrow translucent zones appeared alternately in otolith, while the junctions between translucent zones and opaque zones were annulus. The regressed equation between body weight (W) and body length (L) was W= 0.00002L2.970. Growth model could be described by von Bertalanffy equation: Lt=382.1067×(1-e-0.1058(t+0.1045)) and Wt=949.0577×(1-e-0.1058(t+0.1045))2.970. Growth inflexion occurred at 10.2 years, when body length and body weight were 253.4 mm and 280.4 g, respectively. Comparing with other Schizothoracinae fishes, S. malacanthus is a slow growing, small-sized species, which may be the result of adaption for the ecological and environmental factors in the upper Chin-sha River.

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