Rapport nr 93: Vattenkvalitet och bottenfauna vid fiskodlingarna Solvik fisk, Andersö och Ålands forell, Järsö sommaren 1995
TALLQVIST, M (1995)
TALLQVIST, M
Åbo Akademi, Husö biologiska station
1995
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https://urn.fi/URN:ISBN:951-650-706-9
https://urn.fi/URN:ISBN:951-650-706-9
Tiivistelmä
Water quality and bottom fauna was investigated in June-August 1995 at the fishfarms Solvik fisk, Andersö and Ålands forell, Järsö on Åland. Husö biological station has carried out investigations at these fishfarms since they were started. 'Solvik fisk' begun produktion in 1986 and 'Ålands forell' in 1981.
Water quality (temperature, pH, S‰, oxygen, chl. a, total-P, total-N, secchi) was measured three times during the investigated period. Samples for bottom fauna and organic content analysis were taken in June and August. Dominant species in the plankton was determined in July at Solvik fisk and in July and August at Ålands forell.
The oxygen content was good at both localities during the summer. At Solvik fisk the oxygen saturation varied between 88 and 109% on one meters depth and 75- 102% in the bottom water. At Ålands forell the same values were 94-116% and 83-106%. At both localities the total phosphorus values indicated eutrophic areas (i. e. 23-80 µg/l). The chlorophyll-a-content was also high, especially in July and August at Atands forell. The bivalve Macoma balthica was the dominant species in abundance and biomass at all the stations at Solvik fisk. At Ålands forell Chironomidae dominated stations 1 and 2 (nearest the fish farm) and stations 3-5 were dominated by M. balthica. In July and August Heterocapsa triquetra dominated the plankton at Ålands forell. The water was colored brown by this species. H. triguetra is favoured by high nutrient levets.
Water quality (temperature, pH, S‰, oxygen, chl. a, total-P, total-N, secchi) was measured three times during the investigated period. Samples for bottom fauna and organic content analysis were taken in June and August. Dominant species in the plankton was determined in July at Solvik fisk and in July and August at Ålands forell.
The oxygen content was good at both localities during the summer. At Solvik fisk the oxygen saturation varied between 88 and 109% on one meters depth and 75- 102% in the bottom water. At Ålands forell the same values were 94-116% and 83-106%. At both localities the total phosphorus values indicated eutrophic areas (i. e. 23-80 µg/l). The chlorophyll-a-content was also high, especially in July and August at Atands forell. The bivalve Macoma balthica was the dominant species in abundance and biomass at all the stations at Solvik fisk. At Ålands forell Chironomidae dominated stations 1 and 2 (nearest the fish farm) and stations 3-5 were dominated by M. balthica. In July and August Heterocapsa triquetra dominated the plankton at Ålands forell. The water was colored brown by this species. H. triguetra is favoured by high nutrient levets.