【摘要】 １９８９年３月至１９９１年６月对长江重庆江段１９尾白鲟（体长４８０～１１４８ｍｍ）的形态、生长和食性进行了分析及年龄鉴定。结果表明，幼鲟生长较快，身体各部分增长不一致，眼径、吻须增长较慢。其体长（ＢＬ）、体重（Ｗ）的关系式为：Ｗ＝５．２１１９×１０－６ＢＬ２．９２７１。白鲟为肉食性鱼类，体长约６４７ｍｍ的幼鲟主要摄食小型鲤科鱼类。葛洲坝截流后，长江上游白鲟产卵场未变，种群数量有所回升。更多还原

【Abstract】 Nineteen juvenile Chinese paddlefish ( Psephurus gladius ) with body length ranging from 480 to 1148 mm collected from the upper reaches of Changjiang (Yangtze) River in Chongqing area during March in 1989 to June in 1991 were studied. The main results in relation to morphology, growth, determination of age, feeding habits and a survey of spawning grounds were reported. The juveniles are similar to the adults in morphology. The rate of growth showed differently in different parts of the body. The juveniles grow rapidly. The relationship between body length ( BL ) and body weight ( W ) may be expressed by W=5.2119×10 -6 BL 2.9271 ; The juvenile is a predator feeding primarily Minnows; The survey result revealed that on the upper reaches of Changjing River, Chinese paddlefish spawning grounds had not changed since Gezhouba Dam construction while Chinese paddlefish population had been recovering slowly.更多还原