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SISP 7 - Manual for the Baltic International Trawl Surveys (BITS)

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posted on 01.01.2017, 00:00 authored by ICESICES
This manual describes the coordinated survey design for Baltic international trawl surveys. Randomly stratified fishing-stations location is based on ICES subdivisions and their depth layers as strata to reflect the variability of the Baltic target species temporal-spatial distribution pattern. Besides the traditional Baltic International Trawl Survey (BITS-Q1) in February-March additional coordinated, routine survey (BITS-Q4) has been conducted in November, since 2001. The above-mentioned demersal trawl surveys are coordinated by the ICES WGBIFS. The surveys aimed to the monitoring of the spatial distribution and year-classes abundance of the demersal species, i.e. cod (Gadus morhua), flounder (Platichthys flesus) and other flatfish (plaice - Pleuronectes platessa, turbot - Scophthalmus maximus, dab - Limanda limanda, brill - Scophthalmus rhombus) and to some extent to clupeids (sprat - Sprattus sprattus and herring - Clupea harengus) in the Baltic Sea. WGBIFS agreed in 2009, that data of all analysed fish are uploaded to the ICES Data-base of Trawl Surveys (DATRAS) to support the Baltic ecosystem analyses, taking into consideration ICES subdivisions and rectangles codes.

History

Edition/Version

2

Published under the auspices of the following ICES Steering Group or Committee

  • EOSG

Published under the auspices of the following ICES Expert Group or Strategic Initiative

WGBIFS

Series

ICES Survey Protocols

Volume

7

ISBN

978-87-7482-202-8

ISSN

2304-6252

Recommended citation

ICES. 2017. SISP 7 - Manual for the Baltic International Trawl Surveys (BITS). Version 2. Series of ICES Survey Protocols. 95 pp. http://doi.org/10.17895/ices.pub.2883