Cyanobacterial (blue-green algal) bloom associated pathology in brown trout, Salmo trutta L., Loch Leven, Scotland

Rodger, H.D.; Turnbull, T.; Edwards, C.; Codd, G.A.

Journal of Fish Diseases 17(2): 177-181

1994


ISSN/ISBN: 0140-7775
DOI: 10.1111/j.1365-2761.1994.tb00211.x
Accession: 002336923

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Abstract
A bloom of Anabaena flos-aquae in Loch Leven in June 1992 caused the death of more than a 1000 brown trout. Analysis of the scum from the lake revealed 3 hepatotoxins, microcystin-LR, microcystin-RR and a third variant not fully identified. Pathological investigation of affected fish showed changes in the gills consistent with acute irritation. Liver sections showed necrosis and cellular degeneration. Pyknosis and karyorrhexis of hepatocytes, oedema and focal areas of congestion were seen.

Cyanobacterial (blue-green algal) bloom associated pathology in brown trout, Salmo trutta L., Loch Leven, Scotland