1.1本规程包括确定特定区域内鱼类的数量和质量物种组成。该技术的成功使用取决于:( 1. )防止鱼类逃离样本区域，以及( 2. )找回所有受影响的鱼类，这可能需要三天时间。 1.2 优势: 1.2.1容易解毒。 1.2.2所有本地淡水鱼都易感，但对哺乳动物和鸟类的毒性较低。 1.2.3在低浓度下，鱼类毒性取决于物种、年龄和大小。 1.2.4窒息作用是可逆的。 1.3 限制: 1.3.1在寒冷（低于20°C）和高碱性水中效果较差。 1.3.2较小的鱼和没有气囊的鱼通常不会漂浮。 1.3.3不可能完全随机选择样本区域。 1.3.4有时会发生样本区域以外的过度压井。 1.3.5可以消除食物网生物体。 1.4 应用程序- 这种做法对于管理和影响评估目的的短期和长期研究都很有用。它适用于沿岸和湖沼地区的激流和静水情况。 1.5以英寸-磅为单位的数值应视为标准值。括号中给出的值仅供参考。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 具体危害见第6节。

1.1 This practice covers determination of the quantitative and qualitative species composition of fish in a specified area. The successful use of this technique is dependent on: ( 1 ) preventing fish from escaping the sample area and ( 2 ) retrieving all affected fish, which may take up to three days. 1.2 Advantages: 1.2.1 Easily detoxified. 1.2.2 All native freshwater fish are susceptible, but it has low toxicity to mammals and birds. 1.2.3 At low concentrations fish toxicity depends on species, age, and size. 1.2.4 The suffocating action is reversible. 1.3 Limitations: 1.3.1 It is less effective in cold (below 20°C) and highly alkaline water. 1.3.2 Smaller fish and those without air bladders usually do not float. 1.3.3 Completely random selection of sample areas is not possible. 1.3.4 Overkill beyond sample area can sometimes occur. 1.3.5 Food web organisms may be eliminated. 1.4 Applications— this practice is useful in both short- and long-term studies for management and impact assessment purposes. It is adaptable to both lotic and lentic situations in littoral and limnetic areas. 1.5 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazards, see Section 6.