M74 syndrome

[3] For the first time Bulgarian research team opines that with M74 syndrome are affected also male gametes and worsened parameters of the spermiogram.

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 harengus membras).

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] The M74 syndrome is connected to a weak Atlantic cod (Gadus morhua) stock and strong year classes of sprat in the Baltic Sea.

[5] Atanasov, Vasil; Staykov, Yordan; Tzanova, Milena; Valkova, Elica; Krastev, Boris; Dimitrov, Zhelyazo (2017).