Reproductive Strategies of Zooplanktivorous Haplochromine Cichlids (Pisces) from Lake Victoria before the Nile Perch Boom

Oikos ◽  
1990 ◽  
Vol 58 (3) ◽  
pp. 356 ◽  
Author(s):  
T. Goldschmidt ◽  
F. Witte
Keyword(s):  
Reproductive Strategies ◽  
Lake Victoria ◽  
Nile Perch ◽  
Haplochromine Cichlids

scholarly journals Guilty as charged: Nile perch was the cause of the haplochromine decline in Lake Victoria

2018 ◽  
Vol 75 (9) ◽  
pp. 1542-1559 ◽  
Author(s):  
Brian E. Marshall
Keyword(s):  
Lake Victoria ◽  
Food Chains ◽  
Nile Perch ◽  
Top Down ◽  
Selective Predation ◽  
Bottom Up ◽  
Haplochromine Cichlids ◽  
Lates Niloticus ◽  
Climatic Event ◽  
Existing Data

Debate on the contribution of Nile perch (Lates niloticus) to the demise of Lake Victoria’s 500+ endemic haplochromine cichlids centers around the “top-down” and “bottom-up” hypotheses. The former suggests Nile perch destroyed the haplochromines, causing the disruption of food chains and nutrient cycling and so initiating the accelerated eutrophication of the lake. The latter proposes that haplochromines suppressed Nile perch by preying on its eggs and fry or competing with juveniles for food. A recent paper argued that accelerated eutrophication caused by a climatic event led to their collapse, allowing Nile perch to explode. However, the Nile perch population grew before haplochromines decreased, and they only collapsed once Nile perch biomass exceeded theirs. The chronology indicates that accelerated eutrophication of the lake followed rather than preceded the haplochromine collapse, suggesting that eutrophication was not its cause. A size-selective predation model developed to support the bottom-up hypothesis is discussed in light of existing data, but does not support the bottom-up hypothesis. It was concluded that the top-down model better fits the data and conforms to the law of parsimony.

scholarly journals Socio-Economic Drivers of Fish Species Consumption Preferences in Kenya’s Urban Informal Food System

2021 ◽  
Vol 13 (9) ◽  
pp. 5278
Author(s):  
Oscar Ingasia Ayuya ◽  
Katrine Soma ◽  
Benson Obwanga
Keyword(s):  
Fish Species ◽  
Nile Tilapia ◽  
Food System ◽  
Lake Victoria ◽  
Informal Settlement ◽  
Clarias Gariepinus ◽  
Future Market ◽  
African Catfish ◽  
Nile Perch ◽  
Haplochromine Cichlids

In an effort to contribute to resilient food and nutritional security in urban slums, a food system approach was applied to understand the key socio-economic factors driving fish species consumption in Kibera, the largest informal settlement in Africa located in Nairobi, Kenya. Data were collected from 385 randomly selected households using a structured questionnaire. A multivariate probit model was applied to estimate the relationship between the variables in order to determine the socio-economic drivers of preferences for different fish species. The results indicated that Lake Victoria sardine (Rastrineobola argentea) had the highest preference (73%) among the respondents, followed by Nile tilapia (Oreochromis niloticus) (70%) and Nile perch (Lates niloticus) (23%), respectively, with other fish species at 12%, including African catfish, marbled lungfish, common carp, fulu and tuna (Clarias gariepinus, Protopterus aethiopicus, Cyprinus carpio, Haplochromine cichlids and Thunnus sp., respectively). Large household size showed an increase in preference for the Lake Victoria sardine, while higher income influenced preference for Nile tilapia and Nile perch positively, implying that when more income is available, Nile tilapia is the preferred fish over other fish species. Increased fish prices positively influenced preference for Nile tilapia, which is explained by the willingness to pay extra for quality and origin, for instance, to avoid the cheaply cultivated Chinese fish. In the case of the Lake Victoria sardine, lower prices positively affected the preferences. Religious and cultural practices and beliefs influenced preference for species and consumption of fish. Residents who migrated from western Kenya had a higher preference for the Lake Victoria sardine, while residents born and raised in Kibera had a higher preference for Nile tilapia. Neighbourhood effects reduced the preference for consuming Nile perch. These findings provide insights into future market opportunities for specific target groups. For instance, given that small-sized fish like the Lake Victoria sardine is highly demanded, in order to increase resiliency in food and nutrition security, small-sized cheap Nile tilapia will have a large potential in the future, with ever higher demand specifically from the residents born and raised in Kibera.

scholarly journals The diet of Nile perch, Lates niloticus (L.) after resurgence of haplochromine cichlids in the Mwanza Gulf of Lake Victoria

Hydrobiologia ◽  
2011 ◽  
Vol 682 (1) ◽  
pp. 111-119 ◽  
Author(s):  
Mary A. Kishe-Machumu ◽  
Frans Witte ◽  
Jan H. Wanink ◽  
Egid F. B. Katunzi
Keyword(s):  
Lake Victoria ◽  
Nile Perch ◽  
Haplochromine Cichlids ◽  
Lates Niloticus

The tilapiine fish stock of Lake Victoria before and after the Nile perch upsurge

2002 ◽  
Vol 60 (4) ◽  
pp. 838-856 ◽  
Author(s):  
P. C. Goudswaard ◽  
F. Witte ◽  
E. F. B. Katunzi
Keyword(s):  
Lake Victoria ◽  
Fish Stock ◽  
Nile Perch ◽  
Before And After

Are the exploitation pressures on the Nile perch fisheries resources of Lake Victoria a cause for concern?

2006 ◽  
Vol 13 (1) ◽  
pp. 53-71 ◽  
Author(s):  
T. MATSUISHI ◽  
L. MUHOOZI ◽  
O. MKUMBO ◽  
Y. BUDEBA ◽  
M. NJIRU ◽  
...  
Keyword(s):  
Lake Victoria ◽  
Nile Perch ◽  
Fisheries Resources
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