淡水鱼类的人工繁殖是一项应用很广泛的实用技术，亦是指导学生开展生物科技活动的一个好项目。但是，大多数淡水鱼类的人工繁殖受场地、设备和成本等条件的限制，不宜在实验室进行，所以，选择适当的实验材料成了指导学生进行实验的关键。根据笔者的经验，泥鳅是指导学生做淡 Artificial reproduction of freshwater fish is a widely used practical technique and a good project to guide students in their biotechnology activities. However, artificial breeding of most freshwater fish should not be carried out in laboratories because of the limitation of site, equipment and cost. Therefore, choosing appropriate experimental materials is the key to guiding students to carry out experiments. According to the author’s experience, loach is to guide students to do light