BS EN 14962:2006 pdf download

BS EN 14962:2006 pdf download.Water quality一 Guidance on the scope and selection of fish sampling methods.
This document is developed to select appropriate fish sampling methods for the evaluation of the species composition abundance and age structure of fish in rivers, lakes and transibonal waters
WARNING — Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.
IMPORTANT — It is absolutely essential that tests conducted according to this document be carried out by suitably trained staff.
Within a river or transitional water. categories according to me Tables 1 and 3 usually change from lower to higher ones according to longitudinal changes But also within a relatively short stretch of a river or transitional water, categories can change from lower to higher ones and vice versa. In this case the area itself of a river or transitional water, and not the whole rivet or transitional water, should be classified according to me given categories
6 Fish sampling
61 General
Sampling methods are separated into methods by capture (6 2) and data sampling without fish capture (6.3). The principles are explained and the target water types or categories and fish species are given The suitability of the methods is evaluated depending on the different water categories and their habitats as well as the target species Target species are those species which can efficiently be caught by a particular method. Tables 4 to 6 provide a synopsis on sampling methods suitable or useful for me determination of the population parameters
Methods not described below may be used in order to obtain additional information. They shall not be used exclusively
6.2 Fish sampling by capture
6,2.1 Principle of fish capture
Fish may be caught by active gear (62.2 to 6.24) or passive (62.5 to 6 210). For all gear seasonal aspects shall be taken into account The efficiency of active gear (electric fishing. seining, trawling) especially may vary considerably depending on the time (day/night) of use Active gear is characterized by a comparatively short-term use, whereas passive ones normally are exposed over longer time periods The fishing devices used shall be adapted 10 the local conditions as well as to the expected fish community.