论文部分内容阅读
大韩庄有一天然洼淀,面积460亩,平水深1米左右,含盐量为2‰,枯水季节高达3.5％。洼淀用水依靠自然降雨有时,间断的使用西郊农业上排下来的二林水,由于水体浅,水质不好,所以单产不高,历年平均单产在80-100斤,总产在3-5万斤。1983年三月份共投放鱼种13万尾,其中鲢鱼11万尾,2寸的鲤鱼2万尾,鲢鱼的投放量占总投放量的85％,由于水面较大不宜管理,饲养期间从未投过饵料和施过有机肥料,所以,主体鲢鱼生长情况不好,到6月底鲢鱼平均体重仅有3两左右,而且体质较瘦。如果不采
Hanzhuang has a natural depression, an area of 460 mu, about 1 m deep water, salt content 2 ‰, dry season up to 3.5%. Because of the shallow water and poor water quality, the yield per hectare is not high, with the average annual yield of 80-100 kg and the total output of 3-5 Ten thousand pounds. In 1983 March, a total of 130,000 species of fish were put into operation, of which 110,000 were silver carp and 20,000 were 2-inch carp. The silver carp was put in an amount of 85% of the total. As the water surface was relatively large and unfit for management, Did not cast bait and applied organic fertilizer, so the main body of silver carp growth is not good, by the end of silver carp average weight of only about two or two, but the body is thinner. If not mining