FISKDÖD ORSAKAD AV PRYMNESIUM PARVUM, Fish Mortality Caused by Prymnesium parvum
A bloom of Prymnesium parvum Carter (Prymnesiophyceae) caused a considerable fish death in the Bay of Holminge, ca 12 km NO Stockholm, Sweden, during May and June 1991. The bay is a shallow coastal lake, influenced by brackish water from the Baltic Sea (Kyrkfjärden). During spring 1992 Prymnesium also invaded the Kyrkfjärden area. A maximum value of ca 64 million cells per litre of Prymnesium was recorded at the beginning of June. In the Kyrkfjärden area, especially Chrysochromulina parva occurred together with Prymnesium, but also the cyanobacteria Planktothrix agardhii, Limnothrix redekei and Spirulina subsalsa, a few diatom and dinoflagellate genera and the chlorophyceans Monoraphidium and Pyramimonas. – Some physical and chemical data from the area investigated are given