Abstract
THE increasing recognition of fish (and in the tropics of Tilapia in particular) as farm animals has stimulated interest in the breeding of new and useful strains. In Malacca, Hickling1 hybridized two geographical stocks of Tilapia mossambica Peters to produce both a faster growing strain as well as a skewed sex ratio in favour of males, the latter greatly simplifying the monosex culture technique of Brown and van Someren2. Hybrids have now been reported between T. nilotica (Linné) and T. galilaea (Artédi)3, but their value for fish culture has not yet been assessed. Field observations led Lowe to suspect hybridization of the former with T. nigra (Günther) and T. esculenta Graham in Uganda4.
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