Rapport nr 102: Effekter av drivande alger på fisket i havsområdet mellan Askö och Herröskatan, Lemland, SE Åland
SNICKARS, M (2001)
SNICKARS, M
Åbo Akademi, Husö biologiska station
2001
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Julkaisun pysyvä osoite on
https://urn.fi/URN:ISBN:952-12-0816-3
https://urn.fi/URN:ISBN:952-12-0816-3
Tiivistelmä
Local fishermen were interviewed in the investigated area between Askö and Herröskatan, Lemland, SE Åland. To strengthen the results from the interview, additional field work was conducted. In the study area, six stations were sampled with gill nets, the occurrence of drifting algal mats was investigated along six transects and the biomass of drifting algae was quantified with small nets.
According to the interview, the two main problems in the area are: decreased catches of herring (Clupea harengus) and flounder (Platichthys jlesus) since the middle of 1990s, and occurrence of drifting algae together with water currents caused by ferry traffic during the gill net fishing. Results from the test fishing did not considerably differ from other investigations done in the Archipelago Sea. Trapped algal masses in the gill nets were a considerable problem during the two fishing occasions in June. During the third fishing occasion in August the amount of trapped algal masses in the gill nets were small. Results from the mapping of drifting algal mats and the quantitative measurements with small nets indicate that the problem with drifting algae is mos! obvious in the Flakaviken area, and especially during spring and early summer.
According to the interview, the two main problems in the area are: decreased catches of herring (Clupea harengus) and flounder (Platichthys jlesus) since the middle of 1990s, and occurrence of drifting algae together with water currents caused by ferry traffic during the gill net fishing. Results from the test fishing did not considerably differ from other investigations done in the Archipelago Sea. Trapped algal masses in the gill nets were a considerable problem during the two fishing occasions in June. During the third fishing occasion in August the amount of trapped algal masses in the gill nets were small. Results from the mapping of drifting algal mats and the quantitative measurements with small nets indicate that the problem with drifting algae is mos! obvious in the Flakaviken area, and especially during spring and early summer.