文档介绍：观赏鱼的发展前景及对策 论文
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate d errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured20
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
（二）观赏鱼的代表种类
“金龙”、“红龙”鱼，属骨舌鱼目，骨舌鱼科。原产于印尼，为大型鱼类，体长，侧扁，口上侧位，吻端有须一对，背、臀、尾鳍相连，体呈微红、血红、橙红等色，凶猛鱼类，适宜水温27℃左右。
，在东南亚地区被视为吉祥物，在观赏鱼市场上极为昂贵。
，形似金龙，但体色为银白色，也被人们视为“风水鱼”价格昂贵。
“热带鱼中的皇后”，品种最多，形态最美，俗名天使鱼，属鲈形目，丽鱼科。原产于南美洲亚马逊河水系。体棱形，极侧扁，头小而尖，眼大、背、臀、尾鳍均长，腹鳍条延长呈丝状，体银白色，体侧有四条黑横纹，眼红色，尾鳍上有黄色横纹，性格温顺，喜弱酸性软水，饲养水温23～26℃，喜食动物性饲料，为自择配偶的卵生鱼类。
、胎鳉科。体长形，有极为美丽的花尾巴，因此又称其为孔雀鱼、虹彩鱼，是小型美丽的卵胎生鱼类，性格温和，喜弱碱性水，以浮游动物为食，适宜水温在22～23℃，是世界上最受欢迎的观赏鱼之一。
，俗名白云山鱼，属鲤形目，鲤科。原产于中国广州白云山，小型鱼类，鱼体呈长梭形，全长3～
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c v