SIST EN 14757:2015
(Main)Water quality - Sampling of fish with multi-mesh gillnets
Water quality - Sampling of fish with multi-mesh gillnets
This European Standard specifies a standardised method for sampling fish in lakes, using benthic multi-mesh gillnets. The method provides a whole-lake estimate for species occurrence, quantitative relative fish abundance and biomass expressed as Catch Per Unit Effort (CPUE), and size structure of fish assemblages in temperate lakes. It also provides estimates, which are comparable over time within a lake and between lakes. This European Standard specifies routines for sampling, data handling and reporting, and provides information on applications and further treatment of data. This European Standard also provides guidance on sampling of fish with pelagic multi-mesh gillnets and sampling of fish for age and growth analyses. Selected references in support of this European Standard are given in the Bibliography.
Wasserbeschaffenheit - Probenahme von Fisch mittels Multi-Maschen-Kiemennetzen
Diese Europäische Norm legt ein Verfahren zur Probenahme von Fischen in Seen mittels benthischen Multi-Maschen-Kiemennetzen fest. Dieses Verfahren liefert Daten zur Abschätzung des Artenspektrums im gesamten See, eine quantitative Abschätzung der relativen Artenhäufigkeit sowie der Biomasse, ausgedrückt als Einheitsfang (Catch Per Unit Effort, CPUE) und der Größenverteilung von Fischbeständen in Seen gemäßigter Zonen. Weiterhin liefert sie Abschätzungen, die für zeitliche Vergleiche innerhalb eines Sees und zwischen verschiedenen Seen geeignet sind. Sie spezifiziert Verfahren für Probenahmen, den Umgang mit Daten und deren Protokollierung, und stellt Informationen zur Anwendung und weiteren Behandlung von Daten zur Verfügung. Diese Europäische Norm gibt auch eine Anleitung zur Probenahme von Fischen mit pelagischen Muli-Maschen-Kiemennetzen und zur Altersbestimmung und Wachstumsanalyse. Das Literaturverzeichnis enthält ausgewählte Quellen zur Unterstützung dieser Europäischen Norm.
Qualité de l'eau - Echantillonnage des poissons à l'aide de filets maillants
La présente Norme européenne spécifie une méthode normalisée pour l’échantillonnage des poissons dans les lacs, à l’aide de filets maillants benthiques multimailles. La méthode fournit une estimation, à l’échelle d’un lac, de l’occurrence des différentes espèces, de leur abondance relative, numérique et pondérale, exprimée en capture par unité d’effort (CPUE), et de la structure en taille des peuplements de poissons dans les lacs tempérés. Elle fournit également des estimations comparables dans le temps au sein d’un même lac ou entre plusieurs lacs. La présente Norme européenne donne aussi des informations concernant les routines d’échantillonnage, le traitement et la communication des données, ainsi que les applications et le traitement ultérieur des données. Elle fournit également des informations concernant l’échantillonnage des poissons à l’aide de filets maillants pélagiques multimailles et l’échantillonnage des poissons en vue des analyses de l’âge et de la croissance. La bibliographie présente une sélection d’ouvrages se rapportant à cette norme.
Kakovost vode - Vzorčenje rib s pomočjo zabodnih mrež (gillnets)
Ta evropski standard določa standardizirano metodo za vzorčenje rib v jezerih s pomočjo bentoških zabodnih mrež (gillnets). Metoda omogoča oceno pojavnosti vrste, kvantitativno relativno številčnost rib in biomase, izraženo v ulovu na enoto dela (CPUE), ter velikostno strukturo skupin rib za celotna jezera v jezerih v zmernih podnebjih. Zagotavlja tudi ocene, ki so sčasoma primerljive z ocenami v okviru enega jezera in med jezeri. Ta evropski standard določa rutine za vzorčenje, ravnanje s podatki in poročanje o njih ter zagotavlja informacije o aplikacijah in nadaljnjem ravnanju s podatki. Ta evropski standard zagotavlja tudi smernice za vzorčenje rib s pomočjo pelagičnih zabodnih mrež (gillnets) in vzorčenje rib za analize starosti in rasti. Izbrane reference v podporo temu evropskemu standardu so podane v bibliografiji.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserbeschaffenheit - Probenahme von Fisch mittels Multi-Maschen-KiemennetzenQualité de l'eau - Echantillonnage des poissons à l'aide de filets maillantsWater quality - Sampling of fish with multi-mesh gillnets65.150Ribolov in ribogojstvoFishing and fish breeding13.060.70Preiskava bioloških lastnosti vodeExamination of biological properties of waterICS:Ta slovenski standard je istoveten z:EN 14757:2015SIST EN 14757:2015en,fr,de01-september-2015SIST EN 14757:2015SLOVENSKI
STANDARDSIST EN 14757:20051DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14757
May 2015 ICS 13.060.70; 65.150 Supersedes EN 14757:2005English Version
Water quality - Sampling of fish with multi-mesh gillnets
Qualité de l'eau - Echantillonnage des poissons à l'aide de filets maillants
Wasserbeschaffenheit - Probenahme von Fisch mittels Multi-Maschen-Kiemennetzen This European Standard was approved by CEN on 16 April 2015.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14757:2015 ESIST EN 14757:2015
mm mm 1 43 0,20 2 19,5 0,15 3 6,25 0,10 4 10 0,12 5 55 0,25 6 8 0,10 7 12,5 0,12 8 24 0,17 9 15,5 0,15 10 5 0,10 11 35 0,20 12 29 0,17 Gillnets shall be made out of homogeneous, uncoloured nylon. Each gillnet shall be 30 m long and 1,5 m deep. Each mesh panel shall be 2,5 m long and mounted on a 30 m long buoyancy line (with a recommended linear density in water of 6 g/m), and a 33 m long lead line (recommended linear density in air 22 g/m and in water 9,9 g/m) made out of plastic in light grey colour. The diameter of the thread varies between 0,10 mm for the 5 mm mesh, to 0,25 mm for the 55 mm mesh (see Table 1). The hanging ratio is 0,5 for all mesh sizes. NOTE All mesh panels are commercially available. 5.2 Pelagic gillnets Each pelagic gillnet should preferably consist of the same mesh sizes in the same order as in the benthic gillnets. The height of the pelagic gillnets may be higher than the benthic gillnets, and the height used should always be recorded. When using all the 12 mesh sizes, the length is 30 m. The buoyancy line is 30 m, and the lead line is 33 m to 45 m, depending on the height of the net, with a hanging ratio of 0,5. The weight of the lines is determined by the gillnet height. A gillnet manufacturer should provide such lines to ensure correct gillnet performance. 6 Sampling design and procedure 6.1 Sampling design Fish are not randomly distributed in a lake. Depth distribution varies between fish species and with the ontogeny of the fish. The horizontal distribution may also be influenced by habitat heterogeneity. Neither is the distribution constant over the year, but will vary with temperature and season. SIST EN 14757:2015
ha ≤ 20 21 to 50 51 to 100 101 to 250 251 to 1 000 1 001 to 5 000 0 to 5,9 8 8 16 16 24 24 6 to 11,9 8 16 24 24 32 32 12 to 19,9 16 16 24 32 40 40 20 to 34,9 16 24 32 40 48 56 35 to 49,9 16 32 32 40 48 56 50 to 74,9
40 40 56 64 ≥To
56 64 For small (< 10 ha) and shallow lakes even 8 gillnet-nights could overexploit the fish community, and especially deplete the reproducing stock of certain species too much. The sampling effort should, however, never be less than 4 gillnet-nights (see also 8.1). Whole-lake estimates of the relative fish abundance in lakes larger than 5 000 ha usually require such a large sampling effort that it is practically impossible to use the recommended technique. In cases when larger lakes shall be sampled, it is recommended that the lake is divided into separate basins, and that each basin is treated as a separate lake. In large lakes, where whole-lake estimates of the fish fauna are not of main priority, sampling can be performed at specific stations. Stratification of gillnets is basically related to depth. The principles for depth stratification are given below. In lakes with vegetation cover and in large shallow lakes, other stratification principles shall be considered. However, it should be considered that depth is less variable over time than vegetation, and, therefore, stratification related to vegetation shall be reconsidered at each successive sampling in a particular lake. Reservoirs or lakes with steep banks may also be subjected to a modified stratification of gillnets. 7.2 Depth stratification of benthic gillnets The depth strata are determined in relation to the surface area of each stratum in such a way that each depth stratum approximately equalises the same volume of water. Even if lake morphometry may vary considerably between lakes, it is convenient to use a standardized scheme for stratification. For most lakes an approximation of the depth strata can be based on morphometric lake data. Each lake is divided in approximately equal water volumes resulting in the following depth strata: 0 m to 2,9 m, 3 m to 5,9 m, 6 m to 11,9 m, 12 m to 19,9 m, 20 m to 34,9 m, 35 m to 49,9 m, 50 m to 74,9 m, > 75 m. Lakes deeper than 75 m are rarely subjected to fish sampling using this type of benthic gillnets (see EN 14962). If the exact proportions of the surface area covered by different depth strata are not known, the number of benthic gillnets recommended in each depth stratum is given in Annex A. The table in Annex A includes optional benthic gillnets at depth > 75 m for large lakes (251 ha to 5 000 ha). Experience has shown that fish can be caught in these gillnets, SIST EN 14757:2015
NOTE Example map: Co-ordinate grid, depth contours at 3 m, 6 m and 9 m, location of benthic gillnets (small marks "I") are shown. Figure 1 — Morphometric map of a hypothetical lake of 40 ha with maximum depth of 12 m. Gillnets shall be set in straight lines and at an angle to end up in the desired depth stratum. The catch in each gillnet shall be treated as an independent sample for that particular depth stratum. Gillnets shall not be attached to each other. SIST EN 14757:2015
ha Number of gillnet-nights Total In epilimnion/metalimnion In hypolimnion ≤ 50 4 2 2 51 to 300 8 4 4 301 to 2 000 16 8 8 >2 000 24 12 12 8.2 Depth stratification of benthic gillnets The depth stratification varies between species and may also vary between size classes within the same species. Therefore, it is important that both the epilimnion and the hypolimnion in thermally stratified lakes are sampled, and that all depths of the lake are sampled, even if there is no clear thermal stratification. Gillnets shall be set randomly over the whole lake: a) over the depth stratum which covers the epilimnion and metalimnion; b) in the hypolimnion. SIST EN 14757:2015
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...