池鱼临发病前,一般都有一定的预兆。具体可以从以下几个方面来判断鱼类是否有病,发病种类及轻重缓急程度。 1.水质。水质过浓,水色过深,发出腥臭味,下风处鼻闻尤甚,增氧机工作时这种现象更加明显,特别是在晴天池塘上空多见蜻蜓和蚊子时,表明水质已变 Ikebukuro before the onset, generally have some omens. Specifically from the following aspects to determine whether the fish sick, disease types and priorities. Water quality Water too thick, too dark in color, stench, leeward smell especially, aerator work more pronounced this phenomenon, especially in the sunny sky more common dragonfly and mosquitoes, indicating that water quality has changed