论文部分内容阅读
天津市塘沽区为适应市场变化,调整池塘养殖品种结构。三年来,推广池塘养殖方正鲫收到明显的效果,共增产方正鲫鱼436.92吨。该区1991年,在3080亩池塘混养方正鲫,亩放方正鲫鱼种131尾、亩产方正鲫30.61公斤,体重达220～325克,平均规格256.8克。1992年在5535亩成鱼池套养方正鲫夏花,经102天饲养,当年养成疗正鲫,规格最大达245克,平均131克。亩均产方正鲫17.29公斤。
Tanggu District, Tianjin In order to adapt to market changes, adjust the structure of pond breeds. Over the past three years, the promotion of pond culture Fangzheng carp has received significant results, a total increase of 436.92 tons of Fangzheng carp. In 1991, in 3080 mu of pond polyculture Founder crucian carp, mu put Fangzheng crucian carp 131, mu of Founder crucian carp 30.61 kilograms, weighing 220 ~ 325 grams, the average size of 256.8 grams. In 1992, 5,535 mu of fish ponds were reared to grow summer carp. After 102 days of rearing, Carassius auratus grew up to 245 grams with an average of 131 grams. Mu are produced Fangzheng crucian carp 17.29 kg.