论文部分内容阅读
兰鳃太阳鱼原产北美,属鲈形目太阳鱼科,六十年代初由美国移入日本,现已在日本内陆水域的许多湖泊形成了兰鳃太阳鱼的自然种群,为理想的自然增养对象。1987年11月中国水产学会从日本首次将兰鳃太阳鱼(600尾)引入中国大陆,同年12月引入湖南,下池260尾,均长6.4厘米,均重5.1克。1988年兰鳃太阳鱼列入农业部水产局科研项目,由湖南省水产研究所等单位承担。有关兰鳃太阳鱼的生物学特性研究,国外资料不多,国内还尚未见有报导。现将我们对兰鳃太阳鱼的形态特点、生活习性、生长繁殖以及养殖观察的试验结果报告如下: 一、兰鳃太阳鱼的形态特点兰鳃太阳鱼体高而侧扁,背部隆起,背缘呈弧形,腹部圆。体前部宽后部狭,头尾均小;口裂中等,下颌略长于上颌,近上位;具颌齿,其
Originated in North America from the United States, the blue gill sunfish are now native to North America. They are now native to many lakes in the inland waters of Japan and form natural populations of blue gill sunfish. Raise object 1987 November China Fisheries Association from Japan for the first time the blue gill sunfish (600) introduced into mainland China, in December the same year, introduced to Hunan, the pool of 260, both 6.4 cm long, both weighing 5.1 grams. 1988 blue gill sunfish included in the Ministry of Agriculture Fisheries Research Project, by the Hunan Provincial Fisheries Research Institute and other units. The biological characteristics of blue gill sunfish, foreign data is small, but there have been no reports. Now we report on the morphological characteristics, habits, growth and reproduction and breeding observations of the blue gill sunfish as follows: First, the blue gill sunfish morphological characteristics of the blue gills sunfish high and flat side, back uplift, the back edge of the arc Shape, abdomen circle. The anterior body wide rear posterior, both head and tail are small; mouth cracking medium, the mandible slightly longer than the maxillary, near the upper; with jaw teeth, its