SISP 7 - Manual for the Baltic International Trawl Surveys (BITS).pdf (3.25 MB)
Download fileSISP 7 - Manual for the Baltic International Trawl Surveys (BITS)
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
1Previous edition of
Published under the auspices of the following ICES Steering Group or Committee
- EOSG