The Cichlid Fishes of Lake Malawi, Africa

Abstract of Publication

Morioka, S., and E. Kaunda. 2004. Preliminary examination of the growth of mpasa, Opsaridium microlepis (Günther, 1864) (Teleostomi: Cyprinidae), younger than one year old, collected from Lake Malawi. African Zoology 39 (1): 13-18.  

Daily growth increments in the lapillus of the otoliths of one-year-old mpasa, Opsaridium microlepis, were investigated to estimate the early growth and breeding period. Lapillus increment counts, as age in days, revealed the breeding period to be from May to October. A logistic curve was fitted to total length (L, mm) at age (T, days) data as L = 182.30/(1+e-((T-151.39)/43.46)). Another model that explains lapillus radii (Am)total length and age/lapillus radii relationships was formulated as L = 202.63/(1+e-((430.74 Ln(T)-2160.52)/155.62)). Estimated growth rates from hatching to 75, 76-225 and 226-300 days of age based on above models were about 0.30, 0.90 and 0.30 mm total length per day, respectively. This growth pattern illustrates that mpasa could reach 20 cm total length within a year of hatching.




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