Two biotypes of Chromolaena odorata (L.) King & Robinson (Asteraceae: Eupatorieae) are invading sub-Saharan Africa. One (the Asian/West African biotype) is spreading from tropical West Africa and the other (the southern African biotype) from south-eastern Africa. The area invaded by the former is...

Malawi capture fisheries have drastically declined. The focus of the nation is now on aquaculture as a viable option to increase fish production. The commonly cultured fish, tilapia species, have been blamed for slow growth largely because of precocious breeding habits. Introduction of fast-growing ...