Age, growth and reproductive biology of Lethrinops gossei burgess & axelrod– (Teleostei: cichlidae) in the south east arm of Lake Malawi
Abstract
146 words
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.
Subjects
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