−1 the Mwanza Gulf were no longer monitored sys- had decreased from ca. 1100 to 200 kg h .In the tematically. However, through local ﬁshermen and sample taken in 1997, the contribution of Nile perch ﬁshery researchers we heard that the amounts of hap- had decreased to 76%, while that of haplochromines lochromines in the catches increased. Examination had increased to 21%, however, the total catch rate −1 of several catches in 1997 and 1999 indeed revealed (199 kg h ) remained low. a substantial upheaval of two zooplanktivorous spe- In 1978, about 60% of the demersal haplochromine cies in the sublittoral areas, whereas other species biomass consisted of detritivores/phytoplanktivores remained rare or absent. Processes involved in extinc- (more than 10 species, dominated by H. (Entero- tion are rarely well documented because ecological chromis) “nigrofasciatus”, H. (E.) cinctus, H. (E.) data of species in a community prior to and during the “75” and H. (E.) “dusky wine red ﬁn”) and 30% of disturbance that causes extinction are often lacking. zooplanktivores (12 species, mainly H. (Y.) heusink- In particular for tropical ecosystems, the ﬁsh fauna veldi, H. (Y.) pyrrhocephalus, H. (?) piceatus and H. of Lake Victoria offers one of
Reviews in Fish Biology and Fisheries – Springer Journals
Published: Oct 8, 2004
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