Toxic algae and fish mortality in a brackish-water lake in Åland, SW Finland

Tore Lindholm; Petra Öhman; Katriina Kurki-Helasmo; Brendan Kincaid; Jussi Meriluoto

doi:10.1023/A:1003667728458

Toxic algae and fish mortality in a brackish-water lake in Åland, SW Finland

Tore Lindholm^*
, Petra Öhman
, Katriina Kurki-Helasmo
, Brendan Kincaid
, Jussi Meriluoto

^*Korresponderande författare för detta arbete

Forskningsoutput: Tidskriftsbidrag › Artikel › Vetenskaplig › Peer review

87 Citeringar (Scopus)

Sammanfattning

The brackish-water Lake Vargsundet (SW Finland) was affected by multiple algal toxins and extensive fish mortality in July 1997. Dense populations of the ichthyotoxic haptophyte Prymnesium sp. and the hepatotoxic cyanobacterium Planktothrix agardhii were observed simultaneously, but usually in distinct layers. Fish died in the relatively clear epilimnion where 10-40 million Prymnesium cells per litre were recorded (chlorophyll a range 6-18 μg l^-1). Fish survived in the metalimnion dominated by the hepatotoxic P. agardhii (chlorophyll a 20-40 μg l^-1). The deeper layers were anoxic. The Prymnesium-rich water remained ichthyotoxic until the end of August but the toxicity was less marked in tests with Artemia salina. As even inconspicuous haptophyte blooms with low chlorophyll a concentrations may be harmful, safety and monitoring issues need reconsideration.

Originalspråk	Engelska
Sidor (från-till)	109-120
Antal sidor	12
Tidskrift	Hydrobiologia
Volym	397
DOI	https://doi.org/10.1023/A:1003667728458
Status	Publicerad - 1999
MoE-publikationstyp	A1 Tidskriftsartikel-refererad

Finansiering

We thank the Åland water authorities, especially Mr Carl Storå for arranging financial support. A grant from the Maj and Tor Nessling Foundation to J. M. is also acknowledged. Mr Svante Wistbacka assisted greatly in organizing the test fishing. We thank the staff of the Husö Biological Station and the Åbo Akademi University for excellent working facilities.

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title = "Toxic algae and fish mortality in a brackish-water lake in {\AA}land, SW Finland",

abstract = "The brackish-water Lake Vargsundet (SW Finland) was affected by multiple algal toxins and extensive fish mortality in July 1997. Dense populations of the ichthyotoxic haptophyte Prymnesium sp. and the hepatotoxic cyanobacterium Planktothrix agardhii were observed simultaneously, but usually in distinct layers. Fish died in the relatively clear epilimnion where 10-40 million Prymnesium cells per litre were recorded (chlorophyll a range 6-18 μg l-1). Fish survived in the metalimnion dominated by the hepatotoxic P. agardhii (chlorophyll a 20-40 μg l-1). The deeper layers were anoxic. The Prymnesium-rich water remained ichthyotoxic until the end of August but the toxicity was less marked in tests with Artemia salina. As even inconspicuous haptophyte blooms with low chlorophyll a concentrations may be harmful, safety and monitoring issues need reconsideration.",

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author = "Tore Lindholm and Petra {\"O}hman and Katriina Kurki-Helasmo and Brendan Kincaid and Jussi Meriluoto",

note = "Funding Information: We thank the {\AA}land water authorities, especially Mr Carl Stor{\aa} for arranging financial support. A grant from the Maj and Tor Nessling Foundation to J. M. is also acknowledged. Mr Svante Wistbacka assisted greatly in organizing the test fishing. We thank the staff of the Hus{\"o} Biological Station and the {\AA}bo Akademi University for excellent working facilities. Copyright: Copyright 2009 Elsevier B.V., All rights reserved.",

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AU - Kurki-Helasmo, Katriina

AU - Kincaid, Brendan

AU - Meriluoto, Jussi

N1 - Funding Information: We thank the Åland water authorities, especially Mr Carl Storå for arranging financial support. A grant from the Maj and Tor Nessling Foundation to J. M. is also acknowledged. Mr Svante Wistbacka assisted greatly in organizing the test fishing. We thank the staff of the Husö Biological Station and the Åbo Akademi University for excellent working facilities. Copyright: Copyright 2009 Elsevier B.V., All rights reserved.

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N2 - The brackish-water Lake Vargsundet (SW Finland) was affected by multiple algal toxins and extensive fish mortality in July 1997. Dense populations of the ichthyotoxic haptophyte Prymnesium sp. and the hepatotoxic cyanobacterium Planktothrix agardhii were observed simultaneously, but usually in distinct layers. Fish died in the relatively clear epilimnion where 10-40 million Prymnesium cells per litre were recorded (chlorophyll a range 6-18 μg l-1). Fish survived in the metalimnion dominated by the hepatotoxic P. agardhii (chlorophyll a 20-40 μg l-1). The deeper layers were anoxic. The Prymnesium-rich water remained ichthyotoxic until the end of August but the toxicity was less marked in tests with Artemia salina. As even inconspicuous haptophyte blooms with low chlorophyll a concentrations may be harmful, safety and monitoring issues need reconsideration.

AB - The brackish-water Lake Vargsundet (SW Finland) was affected by multiple algal toxins and extensive fish mortality in July 1997. Dense populations of the ichthyotoxic haptophyte Prymnesium sp. and the hepatotoxic cyanobacterium Planktothrix agardhii were observed simultaneously, but usually in distinct layers. Fish died in the relatively clear epilimnion where 10-40 million Prymnesium cells per litre were recorded (chlorophyll a range 6-18 μg l-1). Fish survived in the metalimnion dominated by the hepatotoxic P. agardhii (chlorophyll a 20-40 μg l-1). The deeper layers were anoxic. The Prymnesium-rich water remained ichthyotoxic until the end of August but the toxicity was less marked in tests with Artemia salina. As even inconspicuous haptophyte blooms with low chlorophyll a concentrations may be harmful, safety and monitoring issues need reconsideration.

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Toxic algae and fish mortality in a brackish-water lake in Åland, SW Finland

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