EN 14011:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserbeschaffenheit - Probenahme von Fisch mittels ElektrizitätQualité de l'eau - Echantillonnage des poissons a l'électricitéWater quality - Sampling of fish with electricity13.060.70Preiskava bioloških lastnosti vodeExamination of biological properties of waterICS:Ta slovenski standard je istoveten z:EN 14011:2003SIST EN 14011:2003en01-september-2003SIST EN 14011:2003SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14011March 2003ICS 13.060.70; 65.150English versionWater quality - Sampling of fish with electricityQualité de l'eau - Echantillonnage des poissons àl'électricitéWasserbeschaffenheit - Probenahme von Fisch mittelsElektrizitätThis European Standard was approved by CEN on 5 December 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14011:2003 ESIST EN 14011:2003

Example of electric fishing protocol.13Bibliography.16SIST EN 14011:2003

The CV can be determined from a pilot study or from data from similar populations. For determination of temporaltrends fewer sites may be required. The selection of sites shall be representative of habitats/biomes within the watershed. Rivers with highenvironmental stress, where no or only a few specimen are caught on several of the sampling sites, have a highCV, and, therefore, an increased number of sites is required to give a good estimate of abundances and agestructures of the species present. Due consideration shall also be given to ease of access and safety of operationalpersonnel.The timing of sampling shall be linked to an understanding of the life history strategies of the target species. Inmost circumstances sampling shall be carried out towards the end of the growing season when juveniles are of asufficiently large size to be caught by electric fishing. However, electric fishing shall not be made at temperaturesbelow 5 °C, because of reduced fish activity and reduced sampling efficiency. At low water temperaturessuccessive (removal) samplings from the same area (e.g. Zippin, 1958) may actually give higher catches in thesecond compared with the first sampling.Subsequent sampling of a particular site shall be carried out at the same time of year and under similar flowconditions. All sampling shall be done in daylight hours. The area of the river to be sampled is dependent upon width, waterdepth, and habitat variation. The minimum length to be sampled for various waters is given in Table 2.Table 2 — Minimum of length to be sampled River dimension Minimum of length to be sampled Small stream, width < 5 m 20 m, whole width has to be sampled Small river, width 5 m to 15 m 50 m, whole width has to be sampled Large river and canal, width > 15 m > 50 m of river margin either on one side or on both sides Large shallow water, water depth < 70 cm 200 m2 Large water bodies (e.g. lakes) > 50 m of littoral zone
In small wadable rivers with high densities of small fish (which is often the case in wide salmon spawning streams)a smaller length may be sufficient. As a rough guidance it is enough to catch 200 fish, but the total sampled areashall be at least 100 m2.SIST EN 14011:2003
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