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Institute of

OF Baltic Sea Fisheries


Science onboard of German fishing vessels: Catch sampling in the Baltic Sea

Lead Institute OF Institute of Baltic Sea Fisheries
Involved Institutes SF Institute of Sea Fisheries

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© M.Hilger

DCF (Data Collection Framework): Data collection for the catch structure of the commercial fisheries on cod, herring, sprat and flatfishes in the Baltic Sea.

Sampling the commercial fisheries of the Baltic Sea is one of our main tasks. For this purpose, our scientific observers regularly go to sea with fishermen to measure the catch on board. On land, we process unsorted catch samples from the fisheries to collect biological parameters like maturity and age.

Background and Objective

Fisheries and catch data are collected for the most important commercially used fish stocks of the Baltic Sea (cod, herring, sprat, flatfishes) within the scope of the German National data collection program. This program is a permanent task, primarily given by the EU regulation 1639/2001 (Data Collection Framework, DCF).


The population models used for stock assessment require input data such as the number of one-, two-, or three-year-old cod in the landings and discards. Therefore, we need to blend the pure landings data that fishermen record in their logbooks (in kilograms per species per fishing area, quarter, and gear) with biological data that we collect. We obtain these biological data as part of continuous sampling on commercial fishing vessels at sea. We sample both active fisheries (trawl vessels) and passive fisheries (gillnets, longlines, trap nets). On board the fishing vessels, our at-sea observers determine discard rates and length distributions in landings and discards. We use our commercial fishery samples to obtain information on important biological parameters such as weight, sex, maturity and age.

Preliminary Results

Results are available as reports. Please refer to the Baltic Fisheries Assessment Working Group report (WGBFAS) at the ICES website

Funding Body

  • EU - European Maritime and Fisheries Fund (EMFF)
    (international, öffentlich)


Permanent task 1.2001 - 12.2027

More Information

Projekt type:
Project status: ongoing


  1. 0

    Bergenius M, Hommik K, Berg CW, Boje J, Brown E, Carlshamre S, Eero M, Finke A, Gilljam D, Goni N, Gröhsler T, Gutkowska J, Haase S, Horbowy J, Kaljuste O, Krumme U, Lövgren J, Mirny Z, Neuenfeldt S, Stötera S, et al (2022) Baltic Fisheries Assessment Working Group (WGBFAS). Copenhagen: ICES, 659 p, ICES Sci Rep 4(44), DOI:10.17895/

  2. 1

    Meyer S, Krumme U, Stepputtis D, Zimmermann C (2022) Use of a smartphone application for self-reporting in small-scale fisheries: Lessons learned during a fishing closure in the western Baltic Sea. Ocean Coastal Manag 224:106186, DOI:10.1016/j.ocecoaman.2022.106186

  3. 2

    Hakansson KB, Mugerza E, Adamowicz M, Basterretxea M, Canha A, Christman M, Clarke L, Cloatre T, Couperus B, Craig J, Demaneche S, Dubroca L, Egekvist J, Elson J, Fernandes AC, Gitarakos G, Glemarec G, Krumme U, Stötera S, Wischnewski J, et al (2022) Working Group on Commercial Catches (WGCATCH; outputs from 2020 meeting). Copenhagen: ICES, 95 p, ICES Sci Rep 4(26), DOI:10.17895/

  4. 3

    Kokkalis A, Wall Andersen M, Willestofte Berg C, Cardinale M, Eero M, Funk S, Hommik K, Krumme U, Nielsen A, Bergenius Nord M, Storr-Paulsen M, Theodorsen T (2021) Inter-Benchmark Process on Western Baltic cod (IBPWEB). Copenhagen: ICES, 76 p, ICES Sci Rep 3(87), DOI:10.17895/

  5. 4

    Funk S, Krumme U, Temming A, Möllmann C (2020) Gillnet fishers’ knowledge reveals seasonality in depth and habitat use of cod (Gadus morhua) in the Western Baltic Sea. ICES J Mar Sci 77(5):1816-1829, DOI:10.1093/icesjms/fsaa071

  6. 5

    Krumme U, Gröhsler T (2013) Analysis of the questionaires concerning the issue of species misreporting in the mixed pelagic fisheries in the Baltic Sea (sprat-herring mix). In: Report of the Benchmark Workshop on Baltic Multispecies Assessments (WKBALT): 4-8 February 2013. Copenhagen: ICES, pp 266-276

  7. 6

    Krumme U, Gröhsler T (2013) Sprat (BS)/Central Baltic Herring (CBH): Analysis of the questionnaires concerning the issue of species misreportning in the mixed pelagic fisheries in the Baltic Sea (sprat-herring mix). In: Report of the Benchmark Workshop on Baltic Multispecies Assessments (WKBALT): 4-8 February 2013. Copenhagen: ICES, pp 266-276


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