精养高产池塘必须培肥水质,但肥水池塘有的长鱼,有的“不长鱼”。其产量和效益区别很大。从表面上看,水色翠绿或黄褐的池塘,透明度小(25cm以下),的确很肥,但“不长鱼”,称为“老水”。水色茶褐或墨绿的池塘,透明度较大(30cm左右),肥度适中,长鱼很快,称为“嫩水”。 Cultivation of high-yielding ponds must cultivate water quality, but there are some long-fowl in the fertile water ponds and some do not grow fish. Its production and benefits vary greatly. On the surface, aqua-green or yellow-brown ponds are very small in size (less than 25 cm), but they are “not long fish” and are called “old water.” Aqua brown or dark green pond, greater transparency (about 30cm), medium fertility, long fish quickly, known as the “tender water.”