Potential factors influencing reproductive success of Baltic cod, Gadus morhua: a review

Article Abstract:

The dramatic decline in eastern Baltic cod stock has been attributed to salinity and oxygen content. Recent studies indicate low cod recruitment is also due to deteriorated spawning conditions, a high mortality rate caused by commercial fishing, and thus a decrease in spawning stock. Additional contributing factors may be the impact of sprat and herring predation on eggs. The investigations concluded it is unlikely that M74 syndrome, which affects the mortality rates in Baltic salmon, is not related to poor cod recruitment.

Patient outcomes, Mortality, Codfish, Codfishes

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Development of the M74 syndrome in wild populations of Baltic salmon (Salmo salar) in Swedish rivers

Article Abstract:

Electrofishing surveys of wild salmon populations (Salmo salar) in Bothnian Bay area rivers in northern Sweden showed low parr densities from 1992. The decrease in salmon parr coincided with a high mortality of alevin/fry due to the M74 syndrome. The significantly negative correlation indicates it is very likely that M74 syndrome affected the mortality of wild salmon, which can be counteracted by a high number of spawners. Therefore it is suggested that exploitation of wild salmon by fisheries be kept at a low level.

Diseases, Salmon, Fishery resources, Fish hatcheries, Fish population declines

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