Change search
ReferencesLink to record
Permanent link

Direct link
Effects of resources and mortality on the growth and reproduction of Nile perch in Lake Victoria
Stockholm University, Faculty of Science, Department of Systems Ecology.
Show others and affiliations
2013 (English)In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 58, no 4, 828-840 p.Article in journal (Refereed) Published
Abstract [en]

1. A collapse of Nile perch stocks of Lake Victoria could affect up to 30million people. Furthermore, changes in Nile perch population size-structure and stocks make the threat of collapse imminent. However, whether eutrophication or fishing will be the bane of Nile perch is still debated. 2. Here, we attempt to unravel how changes in food resources, a side effect of eutrophication, and fishing mortality determine fish population growth and size structures. We parameterised a physiologically structured model to Nile perch, analysed the influence of ontogenetic diet shifts and relative resource abundances on existence boundaries of Nile perch and described the populations on either side of these boundaries. 3. Our results showed that ignoring ontogenetic diet shifts can lead to over-estimating the maximum sustainable mortality of a fish population. Size distributions can be indicators of processes driving population dynamics. However, the vulnerability of stocks to fishing mortality is dependent on its environment and is not always reflected in size distributions. 4. We suggest that the ecosystem, instead of populations, should be used to monitor long-term effects of human impact.

Place, publisher, year, edition, pages
2013. Vol. 58, no 4, 828-840 p.
Keyword [en]
diet shift, existence boundaries, Nile perch, population growth, sustainable fishing
National Category
URN: urn:nbn:se:su:diva-89572DOI: 10.1111/fwb.12089ISI: 000316286700017OAI: diva2:618624


Available from: 2013-04-29 Created: 2013-04-29 Last updated: 2013-04-29Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Downing, Andrea S.
By organisation
Department of Systems Ecology
In the same journal
Freshwater Biology

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: 39 hits
ReferencesLink to record
Permanent link

Direct link