Expeditionsrapport BITS, november 2019

Expeditionen genomfördes med R/V Svea med hjälp av en TV3L bottentrål enligt Baltic International Trawl Survey (BITS) manual (ICES, 2017). Sverige tilldelades 33 slumpvis utvalda stationer. Alla hal kunde utföras. Totalt genomfördes 33 tråldrag med TV3L bottentrål inklusive 8 syrefria tråldrag som inte trålades eftersom syrekoncentrationen nära botten var Under denna undersökning fångades totalt 25 olika fiskarter. Totalfångsten i vikt dominerades av sill, skarpsill, torsk, skrubbskädda, rödspätta och vitling. Hydrografiska parametrar såsom salthalt, temperatur och syrekoncentration, observerades och mättes på samtliga trålstationer. I den här rapporten visas syrekoncentrationen ca 1 meter ovanför botten.
The survey was conducted by the R/V Svea using the TV3L demersal trawl according to the Baltic International Trawl Survey (BITS) manual (ICES. 2017). Sweden was assigned 33 randomly selected hauls. All of the hauls could be performed.In total 33 valid hauls were performed with TV3L demersal trawl including eight hauls with oxygen deficiency which were not trawled because the oxygen concentration close to the bottom was During this survey a total of 25 fish species were caught. Herring, sprat, cod, flounder, plaice and whiting dominated the total catch, in terms of weight.The hydrographic conditions were observed and measured on every station. Only the oxygen concentration at the bottom is presented in the report.