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笔者1989年5～9月用颗粒饵料培育大规格鲤鱼种的鱼池的理化特点,初级生产力及其对鱼产量影响进行了初步研究。该鱼池主要离子含量较高,平均含量达1.73 g/l;pH偏碱性,较稳定,硬度高,碱度较高;有效氮含量平均为2.46 mg/l,其中铵氮占39.2％,亚硝酸态氮占3.75％,硝酸态氮占57.5％,溶解性磷酸盐平均含量为0.095mg/l,N/P为13～144,平均为43。溶解氧平均为7.5mg/l。磷酸盐的含量没有构成初级生产力的限制因子,5～9月其平均水柱月初级毛产氧量为14.18 g/m~2·d,水柱毛产氧量大于水柱耗氧量。平均透明度为20cm,平均补偿深度为84cm,为前者的4.2倍,池水氧气的消耗情况是,池鱼约占25.26％,水呼吸约占57.86％,底质约占11.78％。氧气来源约77.81％靠光合作用,22.19％靠空气溶解和水源补给。以上条件均对鱼产量产生很大影响,鱼产量平均为6507.1 kg/ha,饵料系数平均为1.31。
From May to September 1989, the author conducted a preliminary study on the physical and chemical characteristics, primary productivity and the impact on fish production of fish ponds with large-sized carp cultivated by pellet feeding from May 1989 to September 1989. The fish pond has high content of main ions with an average content of 1.73 g / l; pH is alkaline, stable, high hardness and high alkalinity; the average effective nitrogen content is 2.46 mg / l, of which ammonium nitrogen accounts for 39.2% Nitrate nitrogen accounted for 3.75%, Nitrate nitrogen accounted for 57.5%, dissolved phosphate average content of 0.095mg / l, N / P 13 ~ 144, with an average of 43. Dissolved oxygen averages 7.5 mg / l. Phosphate content did not constitute a limiting factor of primary productivity. From May to September, the average monthly water consumption of primary water was 14.18 g / m ~ 2 · d, and that of water column was greater than that of water column. The average transparency is 20cm, the average compensation depth is 84cm, which is 4.2 times that of the former. The consumption of pool water is about 25.26% for pond fish, 57.86% for water breathing and 11.78% for sediment. About 77.81% of oxygen sources rely on photosynthesis, 22.19% rely on air and water supplies. The above conditions have a great impact on fish production, the average fish production was 6507.1 kg / ha, the average feed coefficient of 1.31.