Mortality of cod released by anglers in the Baltic Sea

Project

 (c)

Mortality of cod released by anglers in the Baltic Sea

Previous investigations showed that a significant number of cod caught by anglers has not reached the minimum landing size of 38 centimeters and have to be released. About 45 to 70 % of all individuals caught from boats and charter vessels are undersized.

Background and Objective

Surveys by the Thuenen Institute of Baltic Sea Fisheries (OF) concluded that the German recreational fishery removes a considerable amount of cod biomass from the Western Baltic cod stock (ICES SD 22-24). As a result, it is recommended that catches of recreational fisheries should be included in future stock assessments. The data showed that the annual cod catches in the Baltic recreational fishery was on average as high as 50 % of the annual landings of the German commercial fleet in the same waters between 2005 and 2010. Previous investigations showed that a significant number of cod caught by anglers has not reached the minimum landing size of 38 centimeters and have to be released. About 45 to 70 % of all individuals caught from boats and charter vessels are undersized. In spite of these high release rates, up to now there is no information about the survival rates of released cod caught by anglers. The primary goal of this study is to investigate (a) the mortality rates of undersized and released cod, (b) the effects of “Catch-and-Release” on the fish and (c) the factors that influence survival.

Approach

Containment Study

Involved Thünen-Partners


Funding Body

  • European Union (EU)
    (international, öffentlich)

More Information

Projekt type:
Project status: finished

Publications

hits: 6

  1. Weltersbach MS, Lewin W-C, Gröger JP, Strehlow HV (2019) Effect of lure and bait type on catch, size, hooking location, injury and bycatch in the western Baltic Sea recreational cod fishery. Fisheries Res 210:121-130, DOI:10.1016/j.fishres.2018.10.002
  2. Weltersbach MS (2018) Einbezug der Sterblichkeit von Rückwürfen in der Freizeitfischerei in das europäische Fischereimanagement. Rostock: Univ, Mathematisch-Naturwissenschaftliche Fakultät, 115 p, Rostock, Univ, Mathematisch-Naturwissenschaftliche Fakultät, Diss, 2018, DOI:10.18453/rosdok_id00002306
    pdf document (limited accessibility) 4050 kb
  3. Ferter K, Weltersbach MS, Humborstad OB, Fjelldal PG, Sambraus F, Strehlow HV, Volstad JH (2015) Dive to survive: effects of capture depth on barotrauma and post-release survival of Atlantic cod (Gadus morhua) in recreational fisheries. ICES J Mar Sci 72(8):2467-2481, DOI:10.1093/icesjms/fsv102
  4. Weltersbach MS, Strehlow HV (2013) Dead or alive - estimating post-release mortality of Atlantic cod in the recreational fishery. ICES J Mar Sci 70(4):864-872, doi:10.1093/icesjms/fst038
  5. Ferter K, Weltersbach MS, Strehlow HV, Volstad JH, Asos J, Arlinghaus R, Armstrong M, Dorow M, Graaf M de, Hammen T van der, Hyder K, Levrel H, Paulrud A, Radtke K, Rocklin D, Sparrevohn CR, Veiga P (2013) Unexpectedly high catch-and-release rates in European marine recreational fisheries: implications for science and management. ICES J Mar Sci 70(7):1319-1329, doi:10.1093/icesjms/fst104
  6. Strehlow HV, Schultz N, Zimmermann C, Hammer C (2012) Cod catches taken by the German recreational fishery in the Western Baltic Sea, 2005-2010: implications for stock assessment and management. ICES J Mar Sci 69(10):1769-1780