University of Groningen
The biology and impacts of Oreochromis niloticus and Limnothrissa miodon introduced in
Lake Kariba
Chifamba, Chiyedza Portia
IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below.
Document Version
Publisher's PDF, also known as Version of record
Publication date: 2019
Link to publication in University of Groningen/UMCG research database
Citation for published version (APA):
Chifamba, C. P. (2019). The biology and impacts of Oreochromis niloticus and Limnothrissa miodon introduced in Lake Kariba. Rijksuniversiteit Groningen.
Copyright
Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).
Take-down policy
If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum.
528794-L-st-Chifamba 528794-L-st-Chifamba 528794-L-st-Chifamba 528794-L-st-Chifamba Processed on: 6-2-2019 Processed on: 6-2-2019 Processed on: 6-2-2019 Processed on: 6-2-2019
Stellingen behorende bij het proefschrift
The biology and impacts of Oreochromis niloticus
and Limnothrissa miodon introduced in Lake
Kariba
Portia C. Chifamba
1. Many invasive species are competitively superior to native species, with the strongest competition in species with similar niches and in closely related species. (This thesis)
2. Fish production in a new water body is increased by the introduction of a fish species with functional traits suited to an available ecological niche. (This thesis)
3. Fish exhibit large variation in individual growth rate upon which fishing exerts selection pressure for slow growth and early maturity. (This thesis) 4. Reproductive effort is an important factor in determining the relative
contribution of different species of fish in the battle for space. (This thesis) 5. Bones we discard when we eat fish are vital in determining biological
attributes of fish populations and how much fish we can eat. (This thesis) 6. Market demands (economic factors) and consumer needs (social factors)
determines the level of commercial fishing. However, it is the environment that determines how fast that fish can be replaced.
7. The best-known examples of ecosystem engineers are humans who presently own many large aquatic ecosystems that they manage to best advantage of their own species.
