看水越冬及其生物学分析

根据黑龙江、吉林地区数十个鱼类越冬池的实测数据 ,从水色、透明度、浮游生物与水体溶氧间的相互关系 ,总结如下规律 :1 水体透明度与浮游植物量负相关 ,与浮游动物量正相关。透明度 <5 0cm者 ,浮游植物丰富而极少浮游动物 ,一般氧气充足 ;透明度 >80cm者 ,多滤食性浮游动物 ,浮游植物少 ,一般溶氧量较低。越冬池透明度以 5 0～ 70cm为宜。 2 根据水体透明度可了解越冬池营养盐的丰欠 ,在越冬中、后期“肥水 (浮游植物多 )易缺肥而瘦水 (浮游动物多 )不易缺肥”。 3 目测冰下水体中鱼类的活动状况和兼测水温变化 ,可为池鱼越冬效果预测提供重要依据

Spending the Winter by Observing Water Change and its Biolgical Analysis

Regularities among water color,transparency,plankton and DO were summarized on the base of the measured data of dozens of winter spending fish ponds in Heilongjiang and Jilin zones: 1 Transparency is negatively correlated with phytoplanktonic biomass,but positively with zooplanktonic biomass.In general,there exist abundant DO,rich phytoplankton,and little zooplankton on condition that transparency is <50 cm.On the contrary,rich filtering food zooplankton,a little phytiolankton,and rather low DO exist in the transparency of more than 80 cm.Suitable transparency is suggested to be 50-70 cm in winter spending ponds. 2 The quantity of nutrient salts can be known according to transparency.Fertile ponds(abundant phytoplankton)are liable to be short of fertilizer in its metaphase and anaphase,but it is the reverse case in poor ponds(rich zooplankton). 3 Observation of fish movement in ice covered ponds and extra measurement of water temperature change can provide important information for predicting the effect of winter spending of fish in ponds.