Rapport nr 106: Fiskens reproduktionspotential i Engrundsfjärden, norra Åland

In summer 2002, a study of fish reproduction and aquatic vegetation was conducted in Engrundsfjärden, N Aland. The study area is ta a great extent very shallow and the aquatic vegetation consists mainly of charophytes. The aim af the study was ta investigate how suitable the area is for fish reprodu...

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Main Author: SILLANPÄÄ, H
Format: Report
Language:Swedish
Published: Åbo Akademi, Husö biologiska station 2002
Subjects:
Online Access:http://www.doria.fi/handle/10024/167328
id ftdoria:oai:www.doria.fi:10024/167328
record_format openpolar
spelling ftdoria:oai:www.doria.fi:10024/167328 2023-05-15T15:53:55+02:00 Rapport nr 106: Fiskens reproduktionspotential i Engrundsfjärden, norra Åland The reproduction potential of fish in Engrundsfjärden, N. Åland SILLANPÄÄ, H 2002 PDF http://www.doria.fi/handle/10024/167328 sv swe Åbo Akademi, Husö biologiska station http://www.doria.fi/handle/10024/167328 URN:ISBN:952-12-1081-8 Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Forskningsrapport 2002 ftdoria 2020-10-14T22:49:46Z In summer 2002, a study of fish reproduction and aquatic vegetation was conducted in Engrundsfjärden, N Aland. The study area is ta a great extent very shallow and the aquatic vegetation consists mainly of charophytes. The aim af the study was ta investigate how suitable the area is for fish reproduction, what species utilize the area and how the dense charophyte vegetation might effect fish reproduction. The fish assemblage in Engrundsfjärden was dominated by Gymnocephalus cernuus. Perca fluviati/is and Rutilus rutilus. A total af nine species were caught with net fishing. Juvenile fish was sampled with a beach seine and the results showed that reproduction was successful in summer 2002. Cyprinids dominated the seine catches. Six species af charophytes were found in the study area. The dominating species were Chara tomentosa, Chara aspera and Chara canescens. Other charophytes found were Chara fragilis, Chara horrida and Chara baltica. The last two are endangered species in Finland according to the Finnish Environment Centre. Dredging can increase the recruitment area for fish in shallow areas but is a serious threath ta the vegetation, especially charophytes. Dredging increases turbidity by causing resuspension af nutrients and particles from the sediments and thereby reducing fight accessible for plants. Charophyte vegetation is known to form important recruitment, nursery and feeding areas for fish and also for many birds. Plenty af roe and numerous juvenile fish were observed among the charophytes during the study in Engrundsfjärden. Dredging should not be conducted without careful evaluation and consideration of the effects an the charophyte vegetation and the fish assemblage dependent an vegetation in Engrundsfjärden. Report Chara aspera Chara canescens Gymnocephalus cernuus Doria (National Library of Finland)
institution Open Polar
collection Doria (National Library of Finland)
op_collection_id ftdoria
language Swedish
description In summer 2002, a study of fish reproduction and aquatic vegetation was conducted in Engrundsfjärden, N Aland. The study area is ta a great extent very shallow and the aquatic vegetation consists mainly of charophytes. The aim af the study was ta investigate how suitable the area is for fish reproduction, what species utilize the area and how the dense charophyte vegetation might effect fish reproduction. The fish assemblage in Engrundsfjärden was dominated by Gymnocephalus cernuus. Perca fluviati/is and Rutilus rutilus. A total af nine species were caught with net fishing. Juvenile fish was sampled with a beach seine and the results showed that reproduction was successful in summer 2002. Cyprinids dominated the seine catches. Six species af charophytes were found in the study area. The dominating species were Chara tomentosa, Chara aspera and Chara canescens. Other charophytes found were Chara fragilis, Chara horrida and Chara baltica. The last two are endangered species in Finland according to the Finnish Environment Centre. Dredging can increase the recruitment area for fish in shallow areas but is a serious threath ta the vegetation, especially charophytes. Dredging increases turbidity by causing resuspension af nutrients and particles from the sediments and thereby reducing fight accessible for plants. Charophyte vegetation is known to form important recruitment, nursery and feeding areas for fish and also for many birds. Plenty af roe and numerous juvenile fish were observed among the charophytes during the study in Engrundsfjärden. Dredging should not be conducted without careful evaluation and consideration of the effects an the charophyte vegetation and the fish assemblage dependent an vegetation in Engrundsfjärden.
format Report
author SILLANPÄÄ, H
spellingShingle SILLANPÄÄ, H
Rapport nr 106: Fiskens reproduktionspotential i Engrundsfjärden, norra Åland
author_facet SILLANPÄÄ, H
author_sort SILLANPÄÄ, H
title Rapport nr 106: Fiskens reproduktionspotential i Engrundsfjärden, norra Åland
title_short Rapport nr 106: Fiskens reproduktionspotential i Engrundsfjärden, norra Åland
title_full Rapport nr 106: Fiskens reproduktionspotential i Engrundsfjärden, norra Åland
title_fullStr Rapport nr 106: Fiskens reproduktionspotential i Engrundsfjärden, norra Åland
title_full_unstemmed Rapport nr 106: Fiskens reproduktionspotential i Engrundsfjärden, norra Åland
title_sort rapport nr 106: fiskens reproduktionspotential i engrundsfjärden, norra åland
publisher Åbo Akademi, Husö biologiska station
publishDate 2002
url http://www.doria.fi/handle/10024/167328
genre Chara aspera
Chara canescens
Gymnocephalus cernuus
genre_facet Chara aspera
Chara canescens
Gymnocephalus cernuus
op_relation http://www.doria.fi/handle/10024/167328
URN:ISBN:952-12-1081-8
op_rights Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden.
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
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