综合养鱼高产池塘的浮游植物

PHYTOPLANKTON IN INTEGRATED FISHCULTURE HIGH-OUTPUT PONDS

根据对综合养鱼不同养殖结构类型、不同产量水平的高产池塘浮游植物定性定量的连续观测：查明了浮游植物丰度及其季节变化；分析了浮游植物群落组成类型及其季节变化；讨论了各型鱼池浮游植物群落组成上的差异性、共同性及浮游植物水华类型与养鱼水质的生物等级。得出结论：综合养鱼高产池塘里主要是隐藻、膝口藻、蓝裸甲藻、角甲藻、裸藻、空球藻、衣藻、棕鞭藻等鞭毛藻类和硅藻、大型绿球藻等优势属种交替形成水华，它们是滤食性鱼类的充足的优质适口饵料，这１０种水华都是一等水质。

The phytoplankton was determined and analyzed during 1979-1984 for integrated fish culture high-output (7. 5-15 metric ton/ha. yr) ponds of three different stocking patterns (20%, 50% and 80% filter-feeding fish stocking, respectively). Investigations were made on the seasonal changes in phytoplankton community including 14 dominant species, which form water bloom alternately. Among others, the Flagellate (including Cryptomonas, Gonyostomum, Gymnodinum cyaneum, Ceratium, Englena, Chlamydomonas,Eudorina, Ochromonas ) are major dominant species population. The phytosynthesis of phytoplankton plays a major role in increasing feeds and dissolved oxygen and purifying water. As water quality reflects the community types and standing biomass of phytoplankton, it is an important index for judging production conditions of fishpond ecosystem. High - output fishponds, which apply manures and feeds the usual 1 st class water quality, are consisted of Cryptomonas bloom, Gymnodirum cyaneum bloom , Ceratium bloom, Gonyostomum bloom, Englena bloom, Chlamydomonas bloom, Eudorina bloom, Ochromoras bloom, Bacillariophyta bloom and Big - algae Chlorococcales bloom, etc.