From a fish sample to stock assessment

Project

Fischprobe in Körben vorm Sortieren (c) Thünen-Institut
Fischprobe in Körben vorm Sortieren (© Thünen-Institut)

DCF (Data Collection Framework): Stock assessment: Compilation of the national catch statistics as basis for stock assessments in ICES on the basis of the requirements of the EU in the Data Collection Framework

Population models want to be fed with numbers of caught fish. At the landing site, however, the fisher only report the landed weight, not the numbers of landed fish. Our expertise is to covert landing weights of the fisheries into numbers of herring or cod to provide the appropriate feed of data for the stock assessment models.

Background and Objective

The Federal Republic of Germany is obliged to collect fisheries data based on the EU regulation 1543/2000 (Data Collection Framework, DCF). This includes the sampling of commercial fisheries, but also the recreational fisheries. In the Baltic Sea region the Thünen Institute of Batlic Sea Fisheries (OF) is responsible to collection the German data, to process them using fisheries biology standards and to transmit the data to the International Council for the Exploration of the Sea (ICES). In the Baltic Sea we collect data from fish stocks used by the German commercial fisheries including the species cod, herring, sprat, flounder, plaice, turbot, dab, salmon and sea trout.

Approach

The Federal Office of Agriculture and Food (BLE) is the national surveillance authority and regularly provides us with logbook data and landing slips. We merge this information with results from our biological sampling from the commercial fisheries. Observers have collected catch and length composition data on board of German commercial fishing vessels; and we analyse unsorted catch samples from the commercial fisheries. In addition, we sample the catches of the marine recreational fisheries.

Preliminary Results

Our quality-approved national fisheries data are regularly transmitted to data bases of ICES (InterCatch, FishFrame). Expert groups involving mainly fisheries scientists use these data, e.g. for stock assessment purposes.

Thünen-Contact


Involved Thünen-Partners


Duration

Permanent task 1.2001 - 12.2018

More Information

Projekt type:
Project status: ongoing

Publilcations

hits: 24

  1. Gröhsler T, Schaber M (2014) Annex 6: Cruise reports from other acoustic surveys in the area : Annex 6a: Western Baltic acoustic survey ; Survey report for FRV "Solea" ; German Acoustic Autumn Survey (GERAS), 30 September 2013 - 19 October 2013. In: Report of the Working Group of International Pelagic Surveys (WGIPS) ; 20-24 January 2014. Copenhagen: ICES, pp 224-251
  2. Gröhsler T, Schaber M (2014) Survey Report for FRV "Solea" German Acoustic Autumn Survey (GERAS) 30 September 2013 - 19 October 2013. In: Report of the Baltic International Fish Survey Working Group (WGBIFS) : 24-28 March 2014 ; Gdynia, Poland. Copenhagen: ICES, pp 250-258
  3. 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
  4. Oeberst R, Gröhsler T, Schaber M, Larson N (2013) Applicability of the Separation Function (SF) in 2011 and 2012. In: Report of the Baltic International Fish Survey Working Group (WGBIFS) : 20-25 March 2013. Copenhagen: ICES, pp 399-405
  5. Oeberst R, Gröhsler T, Schaber M (2013) Applicability of the Stock Separation Function (SF) on the first period of GERAS in 1994-2004. Working Document WKPELA2. Benchmark Workshop on on Pelagic Stocks (WKPELA): 4-8 February 2013. Copenhagen: ICES, 4 p
  6. Gröhsler T (2013) Assessment input database. In: Report of the Benchmark Workshop on Pelagic Stocks (WKPELA): 4-8 February 2013. Copenhagen: ICES, pp 417-437
  7. Oeberst R, Gröhsler T (2013) Comparison of stock indices based on GERAS estimated with the standard procedure and by the new proposed method : Working document Baltic International Fish Survey Working Group (WGBIFS) 20-25 March 2013. Copenhagen: ICES, 9 p
  8. Gröhsler T (2013) Die Lage der Fischbestände im Skagerak/Kattegat und in der Ostsee : Stand 27.08.2013. Copenhagen: ICES, 26 p
  9. Gröhsler T, Oeberst R, Schaber M, Larson N, Kornilovs G (2013) Discrimination of western Baltic spring-spawning and central Baltic herring (Clupea harengus L.) based on growth vs. natural tag information. ICES J Mar Sci 70(6):1108-1117, doi:19.1093/icesjms/fst064
  10. Gröhsler T, Neuenfeldt S (2013) Exploration of different assessment units. In: Report of the Benchmark Workshop on Baltic Multispecies Assessments (WKBALT): 4-8 February 2013. Copenhagen: ICES, pp 249-265
  11. Gröhsler T, Neuenfeldt S (2013) Exploration of new M values derived from SMS. In: Report of the Benchmark Workshop on Baltic Multispecies Assessments (WKBALT): 4-8 February 2013. Copenhagen: ICES, pp 332-344
  12. Gröhsler T (2013) Exploration of XSA settings. In: Report of the Benchmark Workshop on Baltic Multispecies Assessments (WKBALT): 4-8 February 2013. Copenhagen: ICES, pp 314-331
  13. Gröhsler T (2013) German herring and sprat fisheries & stock assessment data in the Baltic Sea in 2012. In: Report of the Baltic Fisheries Assessment Working Group (WGBFAS): 10-17 April 2013; Working Document 2. Copenhagen: ICES, pp 735-761
  14. Gröhsler T (2013) German herring fisheries & stock assessment data in the Western Baltic in 2012. In: Report of the Herring Assessment Working Group (HAWG) . Copenhagen: ICES, pp 806-818
  15. Gröhsler T, Oeberst R, Schaber M (2013) Implementation of the Stock Separation Function (SF) on German commercial landings. In: Report of the Benchmark Workshop on Pelagic Stocks (WKPELA): 4-8 February 2013. Copenhagen: ICES, pp 379-386
  16. Gröhsler T, Oeberst R, Schaber M (2013) Implementation of the Stock Separation Function (SF) within GERAS in 2005-2011. Working Document WKPELA 1. Benchmark Workshop on on Pelagic Stocks (WKPELA): 4-8 February 2013. Copenhagen: ICES, 6 p
  17. Oeberst R, Gröhsler T, Schaber M (2013) Investigations on quality of Stock Separation Function (SF). Working Document WKPELA4. Benchmark Workshop on on Pelagic Stocks (WKPELA): 4-8 February 2013. Copenhagen: ICES, 22 p
  18. Bartolino V, Gröhsler T, Vitale F, Krischansson B, Johansson M (2013) Maturity at age in the WBSSH herring : motivation of the study and background. In: Report of the Benchmark Workshop on Pelagic Stocks (WKPELA): 4-8 February 2013. Copenhagen: ICES, pp 470-475
  19. Oeberst R, Gröhsler T (2013) Quality of age determination. Working Document WKPELA7. In Benchmark workshop on pelagic stocks (WKPELA), WBSSH 04-08 February 2013. Copenhagen: ICES, 3 p
  20. 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
  21. Schaber M, Gröhsler T (2013) Survey Report for FRV "Solea" 2-21 October 2012. In: Report of the Baltic International Fish Survey Working Group (WGBIFS) : Annex 8: Cruise reports of acoustic surveys BASS and BIAS in 2012. Copenhagen: ICES, pp 266-289
  22. Oeberst R, Velasco A, Mieske B (2012) Measuring the international standard trawl for Baltic demersal surveys (TV3-520 Meshes) : working paper Working group of Baltic International Fish Survey, 26 – 30 March 2012. Copenhagen: ICES, 4 p
  23. Velasco A, Oeberst R (2012) Ungewöhnliche Gewichtsabnahme von Dorsch im 2. Jahresquartal im Bornholm Becken (ICES-Gebiet 25) und der Arkonasee (ICES-Gebiet 24). Inf Fischereiforsch 59:19-23, DOI:10.3220/Infn59_19-23_2012
    pdf document (limited accessibility) 255 kb
  24. Velasco A (2010) Bericht über die 629. Reise des FFS "Solea" vom 28.10. bis zum 19.11.2010. 8 p

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