About the RUFORUM 2010 Biennal Conference
"The 2010 RUFORUM Biennial Conference was the second 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 stakeholders 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. This record contains an extended abstract accepted under the theme of Aqua Culture and Fisheries"
Age, growth and reproductive biology of Lethrinops gossei burgess & axelrod– (Teleostei: cichlidae) in the south east arm of Lake Malawi
Abstract:
Life history traits of Lethrinops gossei from south east arm of
Lake Malawi were studied. Validation of age was done by
using analysis of marginal increment and length frequency
distribution. It was assumed that a single opaque ring was laid
down annually in the otoliths. The greatest age estimated was
6+ years (175 ± 1.14 mm total mean length (TL). Growth was
best described by the von Bertalanffy growth model as Lt =
150.06(1 – e-0.27(t + 1.94)) r2 = 0.95. The mean size at maturity for
females was 135.95mm TL and 104.05 mm standard length
(SL). Age at-50% maturity was estimated at 2.14 years. The
mean value for total mortality (Z) from the catch curve analysis
was estimated at 0.63 year-1, natural mortality (M) was 0.38
year1, fishing mortality (F) calculated (F = Z – M) was 0.25
year-1 and the exploitation rate was 0.40.
Les traits d’histoire de la vie de Lethrinops gossei du bras
Sud-Est du lac Malawi ont été étudiés. La validation d’âge a
été faite en utilisant l’analyse de l’accroissement marginal et
de la distribution des fréquences de longueur. On a supposé
qu’un anneau opaque unique a été fixé chaque année dans les
otolithes. Le plus grand âge estimé est de 6 ans (175 ± 1,14
mm de longueur totale moyenne (TL). La croissance a été
mieux décrite par le modèle de croissance de von Bertalanffy
Lt = 150.06(1 – e-0.27(t + 1.94)) r2 = 0.95. La taille moyenne
à la maturité pour les femelles a été 135.95mm de TL et 104,05
mm de longueur standard (SL). L’âge à 50% de maturité a été
estimé à 2,14 ans. La valeur moyenne de la mortalité totale (Z)
à partir de l’analyse de la courbe de capture a été estimée à
0,63 par an. La mortalité naturelle (M) était de 0,38 par an. La
mortalité due à la pêche (F), calculée comme F = Z – M, était
de 0,25 par an et le taux d’exploitation était de 0,40.
Language:
English
Date of publication:
2010
Country:
Region Focus:
Southern Africa
University/affiliation:
Collection:
RUFORUM Conferences and Workshops
Agris Subject Categories:
Agrovoc terms:
Additional keywords:
Licence conditions:
Open Access
Access restriction:
Form:
Printed resource
Publisher:
ISSN:
E_ISSN:
Edition:
Extent:
1277-1279
Notes:
