论文部分内容阅读
内蒙古凉城县岱海渔场,自1985年开始移植大银鱼以来,分别经历三个生产高峰,进一步说明大银鱼不是顶极物种,虽然繁殖力极强,极易形成“爆发”性种群,但也容易受密度制约因子的影响,种群增长呈J-型曲线的变型,环境阻力的突然出现,使大银鱼产量形成剧烈的下降,成为数量波动激烈的类型;在三次大实验的过程中,也可看出只要投入足够数量的受精卵,也能当年直接形成生产性群体。因此,在大银鱼移植驯化的技术措施上应采取相应的对策,可形成持续、稳定的生产群体。
The Daihai fishery in Liangcheng County of Inner Mongolia has experienced three production peaks since its introduction in 1985 and further indicates that the giant whitebait is not a top species. Although it has very strong fecundity and can easily form an “explosive” population, But also easily affected by density constraints. The population growth showed a J-shaped curve, and the sudden appearance of environmental resistance led to the sharp decline in the production of the big silver fishes. As a result, the quantity fluctuated sharply. In the course of three large experiments , But also can see that as long as a sufficient number of fertilized eggs, but also the formation of productive groups that year. Therefore, the corresponding measures should be taken on the technical measures of transplanting and domestication of silverfish to form a continuous and stable production group.