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Kagervall, Anders, 2008. Early to late summer fish distribution in a bay of the Gulf of Bothnia. SLU, Dept. of Wildlife, Fish and Environmental Studies, Umeå. Umeå: SLU, Dept. of Wildlife, Fish and Environmental Studies

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Abstract

This study examined the fish community in a shallow bay in the Gulf
of Bothnia during the summer of 2007. The distribution of several fishsh
species within the bay was investigated. Possible influence on trout is
discussed.
Fish was sampled eight times at three different areas of the bay
starting 4th of June and ending 7th of September. The fish was sampled
with multimesh gillnets and horizontal echosounding.
I found that the bay was dominated by three freshwater species, roach,
perch and ruffe with no apparent effect of season on their distribution.
However, the abundance of roach in the outer area changed significantly
with low abundance early in the summer and high abundance late
summer and autumn. The overall high abundance of warm water species
in trout feeding areas could potentially have a negative effect on trout
through feeding competition.

,

Denna studie undersökte fisksamhället i en grund vik i Bottenviken
under sommaren 2007. Förändring av distribution, i både tid och rum,
undersöktes för flera fiskarter. Eventuella effekter på öring diskuteras.
Fiske med nordiska översiktsnät utfördes på tre olika områden i viken.
Fisket startades fjärde juni och avslutades sjunde september. Vid varje
fisketillfälle gjordes en inspelning med ett horisontellt ekolod på varje
fiskeplats.
Studien visar att viken domineras av tre sötvattensarter, mört,
abborre och gers. Tätheten av mört, i vikens yttre område, förändrades
signifikant under studien, från låg i början till hög på slutet. Den höga
tätheten av fisk i ytterområdet kan potentiellt ha effekt på öring genom
födokonkurens.

Main title:Early to late summer fish distribution in a bay of the Gulf of Bothnia
Authors:Kagervall, Anders
Supervisor:Larsson, Stefan
Examiner:UNSPECIFIED
Series:Examensarbete i ämnet biologi / Sveriges lantbruksuniversitet, Institutionen för vilt, fisk och miljö
Volume/Sequential designation:2008:13
Year of Publication:2008
Level and depth descriptor:Other
Student's programme affiliation:SY001 Forest Science - Master's Programme 300 HEC
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Keywords:Bothnian bay, brackish-water, temporal variation, multimesh gillnet, perch, roach, ruffe, trout
URN:NBN:urn:nbn:se:slu:epsilon-s-8522
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-8522
Subjects:SLU > (S) > Dept. of Wildlife, Fish and Environmental Studies
Fisheries and aquaculture - General aspects
Language:English
Deposited On:01 Nov 2017 12:56
Metadata Last Modified:01 Nov 2017 12:56

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