根据水色鉴别养鱼坑塘浮游生物的组成情况,以判断水质的优劣,既简便又迅速,在渔业生产上很有实用价值。现将我们当地鱼塘中出现的几种主要水色和浮游生物组成情况及其成因介绍如下: 1.黄绿色 在放养量为每亩500尾,其中鲢、鳙鱼(5:2)占70％的坑塘中,用高效有机肥或化肥作追肥,每亩用尿素2.5公斤或人粪尿25—50公 Identification of plankton in aquaculture pond pond according to the composition of water to determine the pros and cons of water quality, both simple and rapid, very useful in fishery production. Here are some of the major aquatic and plankton components that appear in our local fish ponds and their causes as follows: 1. Yellow-green stocking at 500 stocks per mu, of which 70% are silver carp and bighead carp (5: 2) Pit pond, with high-efficiency organic fertilizer or fertilizer for top-dressing, urea 2.5 kg per mu or human waste 25-50 public