Swedish Agency for Marine and Water Management

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FISKREKRYTERING ! BOTTNISKA VIKEN
Perfomers of environmental monitoring, Government Agencies, National Board of Fisheries.
Responsible organisation
1993 (Swedish)Report (Other academic)
Abstract [sv]

1. Rekryteringsutfallets beroende av skilda reproduktionsstrategier och de naturliga omgivningsfaktorerna liksom effekten av miljöstörningar diskuteras för Bottniska vikens fiskarter.

2. En rekryteringsmodell för varmvattenarter som framtagits för abborre har prövats på ett stort antal populationer. Modellen kunde väl förutsäga mellanårsvariationer i rekrytering. Många av Bottniska vikens varmvattenarter och i viss mån även vårlekande strömming kan förutsägas följa samma rekryteringsmönster.

3. Flera höst- och vinterlekande kallvattenarters rekrytering avgörs i Bottniska viken till stor del under första vintern. Modellering av dessas rekryteringsutfall måste bygga på andra grunder än de för varmvattenarter.

4. Som ett led i uppbyggandet av en rekryteringsmodell för vårlekande strömming utfördes studier för att beskriva de yngsta stadiernas optimala uppväxtmiljöer. Dessa rekryteringsområden visades inbegripa tidigare ej studerade områden innanför bottendjup av 6 m.

5. Ett kustavsnitts rekryteringspotential för en enskild art föreslås primärt utgå en rekryteringsmodell sammanfattande de faktorer som påverkar variationer mellan år och områden. Dessa kunskaper kombineras med uppskattningar av de sammanhållna rekryteringområdenas utbredning baserad på rörande kustavsnittets morfometriska karaktärer.

6. Påverkan av miljöstörningar kan bedömas med utgångspunkt från de samband som är kända mellan omgivningsfaktorerna och rekryteringsutfallet.

Abstract [en]

1. The combined effect of reproductive strategy and environmental factors on the recruitment process is discussed for the most important Balticfish species.

2. A recruitment model primarily based on growth-related mortality during the first year of life was developed for perch (Pereafiuviatilis L.). Since growth was in general not food-limited the main factors influencing recruitment were temperature and day-length related. The model predicts growth and variations in year-class strength in the Gulf of Bothnia populations. The recruitment in most other species with similar temperature preferences inhabiting the region, known as warmwater species, was similarly considered to be governed by the abiotic factors.

3. The recruitment of several autumn and winter spawning fish in the Gulf of Bothnia, species which have relatively low temperature preferences, is greatly influenced by the abiotic conditions during the first winter. To model recruitment for these species winter conditions must consequently be considered.

4. Areas occupied by larvae and fry of spring spawning herring (Clupeaharengus L.) during the early mortality, when the yearly recruitment is established, were extensively studied in the Gulf of Bothnia. Shallow and sheltered habitats, previously not considered to be relevant for herring recruitment, were demonstrated to be of great importance as nursery areas.

5. The importance, i.e. its productive qualities, of a coastal area for recruitment can be evaluated from relevant recruitment models, comprehensively treating abiotic and biotic regulating factors. The geographical extension of recruitment areas may be estimated based on knowledge of the general distribution of early developmental life stages in relation to morfometrical characters of the potential environment.

Place, publisher, year, edition, pages
Öregrund: Kustlaboratoriet, Fiskeriverket , 1993. , p. 33
Series
Fiskeriverket Kustrapport 1992-1999, ISSN 1102-5670 ; 1993:4
Keywords [en]
fish, reproduction, perch, warmwaterspecies, coldwaterspecies, herring
Keywords [sv]
fisk, reproduktion, varmvattenart, kallvattenart, abborre, strömming
National Category
Ecology
Research subject
Finance, National; Environmental Objectives, A Rich Diversity of Plant and Animal Life
Identifiers
URN: urn:nbn:se:havochvatten:diva-302OAI: oai:DiVA.org:havochvatten-302DiVA, id: diva2:1456000
Note

Studien har finansierats av forskningsbidrag från Statens naturvårdsverk, nr 5312129— 9 och av Vattenfall, OK GAB, Sydkraft AB samt Imatran Voima OY.

Available from: 2020-07-30 Created: 2020-07-30 Last updated: 2020-12-01

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