Article Abstract:
Research of the Swedish FiRe project, Reproductive Disturbances in Baltic Fish, investigates the M74 syndrome and the high morality rate of offspring of Atlantic salmon (Salmo salar). The cause of M74 is not yet known, but the symptoms indicate similarities to Early Mortality Syndrome exhibited by salmonids from the North American Great Lakes. A combination of factors are believed to contribute to M74 including ecological changes in the food chain and the Baltic Sea. Naturally spawning populations of Baltic salmon are at risk of extinction because it is impractical to successful bathe them in thiamine which has been found to cure afflicted fry in Swedish hatcheries.
User Contributions:
Comment about this article or add new information about this topic:
Article Abstract:
Sea-run brown trout and Baltic cod were examined for low thiamine concentrations, which may be correlated to the onset of M74 syndrome in Baltic salmon populations. Baltic brown trout showed symptoms of M74 and had low mean thiamine concentrations. Thiamine concentrations in Baltic cod showed great variance. It is not known if Baltic cod suffers from mortality associated with M74 syndrome.
User Contributions:
Comment about this article or add new information about this topic:
Article Abstract:
The article targets both pollutants and changes in biotic and abiotic processes as factors which are interfering with fish and crustacean reproductive health. Pulp-mill effluent toxins have been found to retard perch gonadal development, while embryo malformation and asynchronous maturation have been documented in the amphipod Monoporeia affinis.
User Contributions:
Comment about this article or add new information about this topic: