论文部分内容阅读
罗非鱼原产非洲淡水中,但越来越多的人认为其祖先起源于海洋,因为多数种具有耐盐能力,尼罗罗非鱼就是其中之一。本试验的目的在于观察尼罗罗非鱼在海水中养殖的可行性。 材料与方法 实验鱼取自实验室内同胎孵出的25天龄尼罗罗非鱼(Oreochromis niloticus)鱼苗99尾,实验分为淡水、咸淡水(1/2海水+1/2淡水)和海水三个饲养组,每组33尾鱼苗,平均个体重0.15克,分别养于三个容量相同(内径80厘米,高60厘米)的白色圆形玻璃钢水槽中。控温26℃±1℃),充气,投喂豆饼、浒苔和白菜。每周换水1—2次。每个月月底称量各组鱼之总重和计算存活鱼尾数。实验始于1983
Tilapia native to freshwater Africa, but more and more people think their ancestors originated in the ocean, because most of the salt tolerance, Nile tilapia is one of them. The purpose of this experiment was to observe the feasibility of Nile tilapia culture in seawater. MATERIALS AND METHODS Experimental fish were collected from 99-day-old 25-day-old Oreochromis niloticus hatchlings in laboratory. The experiments were divided into freshwater, brackish water (1/2 seawater and 1/2 fresh water) and Seawater three rearing groups, each with 33 fish fry, averaging 0.15 g in body weight, were housed in three white circular glass-fiber reinforced plastic tanks of the same capacity (80 cm in internal diameter and 60 cm in height). Temperature control 26 ℃ ± 1 ℃), inflatable, feeding bean cake, Enteromorpha and cabbage. Change water 1-2 times a week. Weigh the total weight of each group of fish at the end of each month and calculate the number of surviving fish. The experiment started in 1983