Rapport nr 82: En base-line inventering av fisksamhällenas sammansättning längs en skärgårdsgradient på nordöstra Åland
WISTBACKA, S (1992)
WISTBACKA, S
Åbo Akademi, Husö biologiska station
1992
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Julkaisun pysyvä osoite on
https://urn.fi/URN:ISBN:951-650-067-6
https://urn.fi/URN:ISBN:951-650-067-6
Tiivistelmä
A base-line study of the fish communities along a gradient from the inner to the outer archipelago of NW Åland was conducted at seven stations using bentic gill nets at five sampling occasions from July to September, 1991. The stations are on a depth from about 4 to 6 meters, but also two stations with a depth about 20 meters were fished three times. Food choice analysis on perch were done at one sampling occasion. To get a rough picture of the littoral small fish in the area, a bottom-seine was used once at six stations along the gradient. The purpose of this study is to get a picture of the state of the fish communities and populations in relation to some hydrographical parameters (salinity, temperatur and pH) in an almost unpolluted area of the Baltic Sea.
The fish populations in these areas consist of mainly fresh-water species such as roach (Rutilus rutilus) dominating the inner archipelago and perch (Perca fluviatilis) dominating the outer archipelago. In the inner-archipelago white bream (Blicca bjoerkna) is common but on the outer stations it is lacking and some marine species such as Baltic herring (Clupea harengus membras) occurs.
The fish populations in these areas consist of mainly fresh-water species such as roach (Rutilus rutilus) dominating the inner archipelago and perch (Perca fluviatilis) dominating the outer archipelago. In the inner-archipelago white bream (Blicca bjoerkna) is common but on the outer stations it is lacking and some marine species such as Baltic herring (Clupea harengus membras) occurs.