记者从中科院昆明动物研究所获悉，该所系统进化与生物地理学研究组的科研人员，通过多年的监测和数据收集，首次明确了云南高原特有种中甸叶须鱼的体长与体重关系、年龄与生长曲线、繁殖时间、周期等基础生物学和生态学资料。研究成果日前发表于鱼类生态学SCI期刊《应用鱼类学报》。
据该研究组博士陈小勇介绍，中甸叶须鱼为鲤形目鲤科裂腹鱼亚科鱼类，为我国云南高原特有种。该种历史上分布于云南省迪庆藏族自治州的小中甸河、那亚河、碧塔海、属都湖和纳帕海，是青藏高原隆升地质背景下，裂腹鱼类三级演化过程中的特化等级物种。近年来其野外种群数量减少，受危因素增多，被《中国物种红色名录》认定为濒危物种。
在科技部和云南省科技厅的支持下，该研究组从2008年起，对中甸地区原中甸叶须鱼的分布区域进行了水生生物监测。研究结果发现，目前，中甸叶须鱼仅在碧塔海中残存一定种群，其物种地位更加濒危。
“通过野外数据的收集，我们利用漩涡模型分析了中甸叶须鱼的种群生存力，预测了理想状态下未来100年内，其种群动态、自然灾害和人为干扰等外界因素的变化导致种群的变动趋势。我们认为，人类活动对中甸叶须鱼的影响持续时间长，程度大，是威胁鱼类生存的最主要的因素。”陈小勇告诉记者，目前，人类活动造成的不利因素累积，可能在20%以上，如果不采取相应的保护措施，这种不利影响将会逐渐加强，一旦超过35%，中甸叶须鱼将会面临灭绝的危险。（生物谷 Bioon.com）
生物谷推荐的英文摘要
Journal of Applied Ichthyology DOI: 10.1111/jai.12143
Length-weight relationship and biological data of a threatened fish, Ptychobarbus chungtienensis (Tsao, 1964) in Bita Lake of Shangri-La, Yunnan, China
W. S. Jiang1, Y. P. Zhao1,2, W. Y. Wang1,2, J. X. Yang1, X. Y. Chen1,*
This paper provides the length-weight relationship (LWR) and other biological information of a threatened plateau freshwater fish species Ptychobarbus chungtienensis in the subfamily Schizothoracinae of the family Cyprinidae, from the Bita Lake of Shangri-la, in Yunnan, China. The LWR was BW = 0.00954 TL2.95 for a total of 392 individuals, where the coefficient b was close to 3.0, suggesting a near-isometric growth in this species. The total length: standard length relationship was TL = 0.399 + 1.151 SL. Fitting a von Bertalanffy growth function to the observed length-at-age data resulted in L(t) = 53.1 (1-e−0.08(t−0.2)). The natural mortality rate (M) was 0.20 year−1. Length at first maturity (Lm) was 20.57 cm, and 6.3 years the theoretical estimated age at first maturity (Am). Ptychobarbus chungtienensis mature gradually beginning in May, reaching a reproduction peak around August, with most individuals completing reproduction by October. The gonadosomatic index (GSI) was highest in August (GSI = 0.1351) and lowest in October (GSI = 0.0467). The male index (GSI = 0.0866) was lower than in females (GSI = 0.1466) (P < 0.05). Mean condition factor (Km) of P. chungtienensis was 0.8500, and not significantly different between sexes (P = 0.124), but differing significantly between seasons. In October the condition factor (Km = 0.9211) was significantly higher than in May (Km = 0.8379) or in August (Km = 0.8412) (P < 0.05).
