Rapport nr 114: Fisksamhällets tillstånd på Kökar, SE Åland
NYGÅRD, H (2005)
NYGÅRD, H
Åbo Akademi, Husö biologiska station
2005
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This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
Julkaisun pysyvä osoite on
https://urn.fi/URN:ISBN:952-12-1645-X
https://urn.fi/URN:ISBN:952-12-1645-X
Tiivistelmä
A first attempt to a holistic survey of fish fauna in the Käkar area, Aland, was done during summer 2005. Local fishermen have for a /anger time complained about decreased fish catches, and thus this investigation was considered as necessary. This investigation consisted of several subprojects. As the basis for the entire investigation, fisheries statistics were analyzed. Further, /oca/ fishermen were interviewed to get an overview of the problems and changes in fish community. Seining for juvenile fish and test-fishing was performed to get a picture of the present fish stocks and their capability for recruitment.
The reported catches have decreased to a third of what they were in 1998. The catches of almost all commercially important species have declined and the largest change is in the herring catches. Smal/er catches and disturbance from drifting algae and sea/s have lead to less motivation among the fishermen, which probably strengthens the decline further. The greatest cancern has been on the disappearance of pike, which seems to be a general trend in the outer archipelago areas in the Baltic Sea. Only one pike was caught in the test-fishing. Perch was the mast common species in the test-fishing, fo/fowed by ruffe. These species were commonly caught at all depths. The amount of roach, and cyprinids in general, was small on Käkar. Whitefish and pikeperch occurred, but in low numbers. The mast abundant species in the seining was three-spined stickleback, which occurred in great numbers both during spring and late summer. In the spring mast of the sticklebacks caught were adults, while almost only juveniles were noted in late summer. No juveniles of the commercially important species where found on Kökar.
The reported catches have decreased to a third of what they were in 1998. The catches of almost all commercially important species have declined and the largest change is in the herring catches. Smal/er catches and disturbance from drifting algae and sea/s have lead to less motivation among the fishermen, which probably strengthens the decline further. The greatest cancern has been on the disappearance of pike, which seems to be a general trend in the outer archipelago areas in the Baltic Sea. Only one pike was caught in the test-fishing. Perch was the mast common species in the test-fishing, fo/fowed by ruffe. These species were commonly caught at all depths. The amount of roach, and cyprinids in general, was small on Käkar. Whitefish and pikeperch occurred, but in low numbers. The mast abundant species in the seining was three-spined stickleback, which occurred in great numbers both during spring and late summer. In the spring mast of the sticklebacks caught were adults, while almost only juveniles were noted in late summer. No juveniles of the commercially important species where found on Kökar.