【作者】 田媛； 牟希东； 汪学杰； 顾党恩； 胡隐昌； 罗建仁；

【Author】 Tian yuan 1,2 , Mu Xidong 1 , Wang Xue-jie 1 , Gu Dangen 1 , Yinchang Hu 1 , Jianren Luo 1 (1 Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Ministry of Agriculture, Guangzhou 510380, China; 2 Shanghai Ocean University, Shanghai, 201306, China)

【机构】 中国水产科学研究院珠江水产研究所农业部热带亚热带水产资源利用与养殖重点实验室； 上海海洋大学；

【摘要】 本文描述了双须骨舌鱼(Osteoglossum bicirrhosum)的外部形态和内部结构,并对其核型进行了分析。通过对试验鱼的观察、测量、解剖和拍照,我们得到如下结果:双须骨舌鱼体呈侧扁形;口上位,口裂大;侧线发达,侧线鳞数35-36;鳍式分别为D43~46;P1,6;V1,5;A50~54,C12;体长分别是体高、头长、尾柄长、尾部长的5.34倍、5.23倍、97.62倍、1.82倍,头长分别是吻长、眼径和眼间距的3.95倍、6.04倍、2.96倍,体高是体宽的2.05倍;无雌雄异型现象。胃发达呈U型,幽门盲囊短且粗;鳔1室,与体腔等长且位于体腔上部紧贴脊椎骨。雄、雌性双须骨舌鱼性腺均为单侧性腺,成熟雌鱼所含卵粒数较少,但卵径较大。以肾脏为材料,用空气干燥法制备染色体标本,双须骨舌鱼的染色体数目为2n=56,核型公式为2sm+26st+28t,NF=58,未见异型性染色体。更多还原

【Abstract】 The morphological structure and karyotype of Osteoglossum bicirrhosum were studied. The fish has a laterally compressed body covered with silver scales, a point large mouth and two well developed lateral lines with 35-36 scales. Gill rakers are short and sparse. The soft fin rays are D43~46, PⅠ-6, VⅠ-5, A50~54, C12 respectively. The body length is 5.34, 5.23, 97.62 and 1.82 times of body height, head length, trail handle length and trail length respectively; the head length is 3.95, 6.04, and 2.96 times of snout length, eye diameter and diameter between eyes respectively; the body height is 2.05 times of body width. No sexual dimorphism has been found. The fish has a very developed stomach with "U"-shape and two pyloric caeca. The swim bladder, length of which is equal to that of body cavity, has one room and locates above body cavity as well as adjacent to vertebra. Both male and female have unilateral gonad and eggs of mature females are fewer, but bigger. The number of chromosome is 2n=56 and the karyotype is 2sm+26st+28t, NF=58. No cytologically distinguishable sex chromosome has been found.更多还原