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Distribution and abundance of young pelagic fish: monitored by hydroacoustics in two coastal areas in the SW Bothnian Sea
Institute of Ecology, Vilnius, Lithuania.
Institute of Ecology, Vilnius, Lithuania.
Utförare miljöbevakning, Myndigheter, Fiskeriverket.
Ansvarig organisation
1994 (Engelska)Rapport (Övrigt vetenskapligt)
Abstract [en]

The distribution of young pelagic fish in autumn was studied by hydroacoustic techniques in two coastal areas in the SW Bothnian Sea, one exposed to cooling water from a nuclear power plant and the second a reference area free from local disturbance. Generally, herring young-of-the-year dominated among pelagic fish and often constituted over 80% of the total numbers of fish counted. Young herring were concentrated to certain parts of the studied archipelagos, predominantly to the more shallow waters and to the outer parts of the small inlets commonly occurring in these coastal areas. When comparing the results of subsequent visits in the different study areas, it was evident that the estimated densities often varied markedly between days, although the distributionpatterns did not change. This was interpreted as an effect of migrations in and out of waters too shallow to be monitored by echosounder techniques. In September young herring evidently still depends upon an access to sheltered and very shallow habitats. Abundances of herring fry were higher in the cooling water exposed area compared to the reference, supporting earlier observations on positive temperature effects on fishrecruitment at this nuclear power plant.

Ort, förlag, år, upplaga, sidor
Öregrund: Kustlaboratoriet, Fiskeriverket , 1994. , s. 25
Serie
Fiskeriverket Kustrapport 1992-1999, ISSN 1102-5670 ; 1994:2
Nyckelord [en]
pelagic fish, herring, hydroacoustics, nuclear power, migration
Nyckelord [sv]
pelagisk fisk, sill, hydroakustik, kärnkraft, fiskvandring
Nationell ämneskategori
Ekologi Oceanografi, hydrologi och vattenresurser
Forskningsämne
Finansiering, Nationellt finansierad miljöövervakning; Sveriges miljökvalitetsmål, Ett rikt växt- och djurliv
Identifikatorer
URN: urn:nbn:se:havochvatten:diva-311OAI: oai:DiVA.org:havochvatten-311DiVA, id: diva2:1456297
Tillgänglig från: 2020-08-04 Skapad: 2020-08-04 Senast uppdaterad: 2020-12-01

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EkologiOceanografi, hydrologi och vattenresurser

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