uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Fecundity of flounder, Pleuronectes flesus, in the Baltic Sea: reproductive strategies in two sympatric populations
Gotland University, School of Culture, Energy and Environment. (Ar Research Station)
(Ar Research Station)
2010 (English)In: Journal of Sea Research, ISSN 1385-1101, Vol. 64, 190-198 p.Article in journal (Refereed) Published
Abstract [en]

Two sympatric flounder populations with different reproductive strategies, offshore spawning at 10-20 psu producing pelagic eggs and coastal spawning at 5-7 psu with demersal eggs respectively, inhabit the brackish water Baltic Sea. Salinity governs the reproductive success by irregular saline water inflows and hence stock abundance and distribution. The potential fecundity (the standing stock of vitellogenic oocytes in the pre-spawning ovary) was assessed for fish sampled at five locations (two for offshore spawners and three for coastal spawners) along the salinity gradient (ICES SD 25, 27/28, 28 and 29).  Multiple linear regression analysis resulted in r2-values of 0.698-0.894 for the respective sampling location with somatic weight or total fish length as the main predictor, and otolith weight (proxy for age) and oocyte density (by gravimetric counting) as additional predictors. Analysis by univariate regressions using GLM revealed significantly higher fecundity for coastal spawning- than offshore spawning flounder (~69% more oocytes for an intermediate sized fish) but no intra-population differences. Similarly, gonad dry weight was significantly higher for coastal spawning flounder. Further, growth estimations indicated higher growth in offshore spawning- than in coastal spawning flounder suggesting that the coastal spawning population allocate relatively more resources into reproductive growth than somatic, potentially a result of strong selection for high fecundity of flounder producing demersal eggs due to poor egg survival for this spawning strategy. Earlier studies on fecundity of Baltic flounder are reviewed and discussed with consideration of inter-population differences questioning the idea of in general higher fecundity of flounder in the Baltic Sea.

Place, publisher, year, edition, pages
Den Burg: Netherlands Institute for Sea Research , 2010. Vol. 64, 190-198 p.
Keyword [en]
Fecundity, Fitness, Population, Spawning strategy, Flounder, Baltic Sea
National Category
Ecology Biological Sciences
Research subject
URN: urn:nbn:se:hgo:diva-539DOI: 10.1016/j.seares.2010.02.001OAI: oai:DiVA.org:hgo-539DiVA: diva2:324052
Available from: 2010-06-14 Created: 2010-06-14 Last updated: 2013-07-01Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Nissling, Anders
By organisation
School of Culture, Energy and Environment
In the same journal
Journal of Sea Research
EcologyBiological Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 230 hits
ReferencesLink to record
Permanent link

Direct link