Movements of Individual Salmon (Salmo salar) in the Baltic Sea Revealed by Stable Isotopes

Abstract Mikkonen, J., Keinänen, M., Casini, M., Pönni, J., and Vuorinen, P. J. 2011. Relationships between fish stock changes in the Baltic Sea and the M74 syndrome, a reproductive disorder of Atlantic salmon (Salmo salar). – ICES Journal of Marine Science, 68: 2134–2144. The M74 syndrome of Baltic salmon (Salmo salar), which appears as increased yolk-sac fry mortality (YSFM), impairs the reproduction of salmon stocks. Changes in the prey stocks of Baltic salmon in its two feeding areas, the southern Baltic Proper (BPr), where sprat (Sprattus sprattus) was the main prey species during the high incidence of M74, and the Bothnian Sea, where herring (Clupea harengus) is the dominant species, were analysed in relation to salmon growth and size and in relation to the incidence of M74. The high condition factor (CF > 1.05) of prespawning salmon predicted high YSFM. From the various stock factors of sprat and herring in the southern BPr, the biomass of sprat had the strongest positive relationships with the CF of prespawning salmon, and the total prey biomass with YSFM. It is concluded that the ample but unbalanced food resources for salmon in the BPr, primarily sprat, induce M74. By reducing the fishing pressure on cod (Gadus morhua) and by more effectively managing the sprat fishery in years when the cod stock is weak, the incidence of the M74 syndrome could be reduced and even prevented.

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Fatty acid composition of sprat (Sprattus sprattus) and herring (Clupea harengus) in the Baltic Sea as potential prey for salmon (Salmo salar)

Helgoland Marine Research ◽

10.1186/s10152-017-0484-0 ◽

2017 ◽

Vol 71 (1) ◽

Cited By ~ 20

Author(s):

Marja Keinänen ◽

Reijo Käkelä ◽

Tiina Ritvanen ◽

Timo Myllylä ◽

Jukka Pönni ◽

...

Keyword(s):

Fatty Acid Composition ◽

Fatty Acid ◽

Baltic Sea ◽

Acid Composition ◽

Salmo Salar ◽

Clupea Harengus ◽

Potential Prey ◽

The Baltic Sea ◽

Sprattus Sprattus ◽

The Baltic

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Mercury cycling in the Baltic Sea: can stable isotopes help us ?

10.7185/gold2021.5803 ◽

2021 ◽

Author(s):

Sylvain Bouchet ◽

Erik Björn ◽

David Amouroux ◽

Anne Soerensen ◽

Emmanuel Tessier

Keyword(s):

Stable Isotopes ◽

Baltic Sea ◽

Mercury Cycling ◽

The Baltic Sea ◽

The Baltic

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Annual changes in the proportions of wild and hatchery Atlantic salmon (Salmo salar) caught in the Baltic Sea

ICES Journal of Marine Science ◽

10.1016/j.icesjms.2006.04.010 ◽

2006 ◽

Vol 63 (7) ◽

pp. 1274-1285 ◽

Cited By ~ 33

Author(s):

Marja-Liisa Koljonen

Keyword(s):

Atlantic Salmon ◽

Baltic Sea ◽

Salmo Salar ◽

Wild Fish ◽

Gulf Of Finland ◽

Substantial Contribution ◽

The Baltic Sea ◽

Atlantic Salmon Salmo Salar ◽

The Baltic ◽

The Gulf Of Finland

Abstract DNA-level information from an eight-loci microsatellite baseline database of 32 Atlantic salmon (Salmo salar) stocks was used with a Bayesian estimation method to assess the stock and stock group proportions of Finnish salmon catches in the Baltic Sea area. The proportions of seven stock groups, important to fisheries management, were assessed in catch samples taken between 2000 and 2005. In the Gulf of Bothnia area, the proportion of wild fish in catches showed an increasing trend in all areas until 2003, mainly because of the decrease in total catches caused by the relatively greater mortality of hatchery-reared fish compared with wild fish. In 2004, the total number of wild fish caught had also increased, indicating an increase in the abundance of wild stocks. In catches from the Åland Sea, the proportion of wild fish increased from 44% in 2000 to 70% in 2004, while the catch during the same period increased from 4628 to 7329 fish. In the Gulf of Finland, the local Neva salmon stock, which is released by Estonia, Finland, and Russia, made the largest contribution. In the western part of the Gulf of Finland, fish originating in the Baltic Main Basin also made a substantial contribution to catches. The threatened eastern Estonian and Russian wild stocks were recorded only in the western part of the Gulf of Finland, where the proportion of wild fish increased from 9% in 2003 to 19% in 2004.

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Phylogeographic lineages and differentiation pattern of Atlantic salmon (Salmo salar) in the Baltic Sea with management implications

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f99-104 ◽

1999 ◽

Vol 56 (10) ◽

pp. 1766-1780 ◽

Cited By ~ 49

Author(s):

Marja-Liisa Koljonen ◽

Håkan Jansson ◽

Tiit Paaver ◽

Oleg Vasin ◽

Jarmo Koskiniemi

Keyword(s):

Atlantic Salmon ◽

Baltic Sea ◽

Salmo Salar ◽

Isolation By Distance ◽

Conservation Strategy ◽

The Baltic Sea ◽

Genetic Management ◽

Atlantic Salmon Salmo Salar ◽

Starting Point ◽

The Baltic

The genetic structure and isolation pattern of the Atlantic salmon (Salmo salar) throughout its range in the Baltic Sea were examined as a starting point for a conservation strategy for the species in this area. The allozyme variation in seven polymorphic loci was studied in 5125 salmon from 24 rivers in four countries. A clear dichotomy was observed between stock groups from southeastern (Russia, Estonia, Latvia, southern Sweden) and northwestern (northern Finland, northern Sweden) drainage regions, corresponding to the postglacial colonisation of the Baltic Sea by two phylogeographic lineages, one from the east (the Ice Lake lineage) and one from the west (the Atlantic lineage). The geographical and genetic distances between stocks fit the one-dimensional "isolation-by-distance" model (p < 0.001). The estimated gene flow ranged from 0 to10 migrants per generation. The total diversity of hatchery stocks was 72% of that of the wild stocks. Genetically similar stock groups, phylogeographic lineages, and drainage regions are recommended for use as genetic management units in addition to stock level.

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