Age and Growth of the Nile Perch, Lates Niloticus L. in Lake Victoria, Uganda

Abstract: 
This research determined age and growth of Nile perch (Lates niloticus) from Lake Victoria commercial catches using transverse-sectioned sagittal otoliths. Marginal increment analysis of the otoliths indicated bimodal deposition of annuli over a 12-month period, with the highest opaque zone deposition corresponding to the two seasonal peaks of rain (i.e. March to May and September to November) characteristic of this equatorial region. A difference in growth rate between male and female Nile perch was observed with the females having faster growth rates and reaching a large size at older ages than their male counterparts.
Cette recherche a déterminé l’âge et la croissance du poisson qu’on appelle la perche du Nil (Lates niloticus) se trouvant dans le lac Victoria. Ils sont captures pour de raisons commerciales en utilisant une section d’otolithes sagittaux transversaux. L’analyse de croissance marginale des otolithes a montré de dépôt bimodal des anneaux sur une période d’audelà de 12 mois, avec une zone plus opaque de déposition correspondant aux deux pics saisonniers de pluie (c’est-à-dire de mars à mai et septembre à novembre), caractéristique de cette région équatoriale. Une différence de taux de croissance entre la perche du Nil mâle et femelle a été observée avec les femmes ayant des taux de croissance plus rapides et peuvent atteindre une grande taille chez les personnes âgées que leurs homologues masculins.
Language: 
Extended abstracts submitted under Harnessing Aquaculture and Fisheries Resources
Date of publication: 
2012
Country: 
Region Focus: 
East Africa
Author/Editor(s): 
Collection: 
RUFORUM Conferences and Workshops
Licence conditions: 
Open Access
Access restriction: 
Form: 
Printed resource
Publisher: 
Notes: 

The 2012 RUFORUM Biennial Conference is the third in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholers in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. The third Biennial Conference was attended by 657 participants.This record contains an extended abstract accepted under the theme of Harnessing Aquaculture and Fisheries Resources.