World Library  
Flag as Inappropriate
Email this Article

M74 syndrome

Article Id: WHEBN0028312507
Reproduction Date:

Title: M74 syndrome  
Author: World Heritage Encyclopedia
Language: English
Subject: Salmon, Fish diseases, Rui-be, Salmon tartare, Black Sea salmon
Publisher: World Heritage Encyclopedia

M74 syndrome

The M74 syndrome is a reproduction disorder of salmon (Salmo salar) feeding in the Baltic Sea. M74 manifests as offspring mortality during the yolk-sac fry phase. Before dying, the yolk-sac fry display typical symptoms.[1] [2] Thiamine (vitamin B1) deficiency in eggs is the immediate cause of M74 mortality. The deficiency can be prevented by thiamine treatments.[3]

The thiamine deficiency syndrome M74 is related to the fat and thiamine content of prey fish. The diet of Baltic salmon leads to thiamine deficiency in eggs and consequently to the mortality of yolk-sac fry: The main prey species of the Baltic salmon are sprat (Sprattus sprattus) and herring (Clupea harangus membras). Average fat content is greater in sprat than in herring. The fat content is highest and the thiamine concentration is lowest in the youngest sprat. The need for thiamine depends on the amount of fat in the diet. Thiamine deficiency in eggs results from an unbalanced diet abundant in fatty prey fish, such as young sprat, from which the supply of thiamine is insufficient in proportion to the supply of energy and unsaturated fatty acids for salmon.[1]

Relationships between fish stock changes in the Baltic Sea and the M74 syndrome: The M74 syndrome is connected to a weak Atlantic cod (Gadus morhua) stock and strong year classes of sprat in the Baltic Sea. Since the collapse, heavy fishing mortality as well as predation on cod eggs by sprat and food competition between sprat and young-of-the-year cod has inhibited cod recovery. Coincidentally with the decline in the cod stock since 1982, and following the consequent reduction in predation pressure, the sprat stock increased rapidly, and salmon therefore had more food. Salmon grew faster, resulting also in a high CF.[4]

Briefly: Plentiful fatty sprat as prey for salmon leads to reproduction disorder


  1. ^ a b Marja Keinänen, et al. (March 19, 2012). "The thiamine deficiency syndrome M74, a reproductive disorder of Atlantic salmon (Salmo salar) feeding in the Baltic Sea, is related to the fat and thiamine content of prey fish". ICES Journal of Marine Science 69 (4): 516–528.  
  2. ^ Marja Keinänen, et al. (2008). "The M74 syndrome of Baltic salmon: the monitoring results from Finnish rivers up until 2007 [1]". Riista- ja kalatalous – Selvityksiä. 4/2008: 21. 
  3. ^ P. Koski (June 30, 2002). "Parental Background Predisposes Baltic Salmon Fry to M74 Syndrome". Acta Veterinaria Scandinavica 43 (2): 127–130.  
  4. ^ Jaakko Mikkonen, et al. (2011). "Relationships between fish stock changes in the Baltic Sea and the reproductive syndrome, M74 of the Atlantic salmon (Salmo salar L.)". ICES Journal of Marine Science 68 (10): 2134–2144.  
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.