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。此技术的成功使用取决于:( 1. )防止鱼类逃离样本区域，以及( 2. )取回所有受影响的鱼，这可能需要长达三天的时间。 1.2 优势: 1.2.1 容易排毒。 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，鱼类的毒性取决于物种、年龄和体型。 1.2.4 窒息作用是可逆的。 1.3 局限性 1.3.1 它在寒冷（低于20 °C）和高碱性水。 1.3.2 较小的鱼和没有气囊的鱼通常不会漂浮。 1.3.3 完全随机选择样本区域是不可能的。 1.3.4 有时会发生样本区域以外的超压。 1.3.5 食物网生物可能会被消灭。 1.4 应用程序-- 这种做法在管理和影响评估目的的短期和长期研究中都很有用。它适用于沿海和湖泊地区的激流和静水情况。 1.5 以英寸表示的值- 磅单位应视为标准单位。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体危险，请参阅第节 7. . 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

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 standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazards, see Section 7 . 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.