**Acknowledgements**

The chapter contents includes information and data from surveys which were undertaken through the support received from the director of the Kenya Marine and Fisheries Research Institute. Similarly, Lake Victoria Environmental Management Project (LVEMP) provided field support during 2003, 2004, 2010, and 2012 surveys. Surveys conducted in 1994/1995 were supported by the Kenya-Belgium project in freshwater ecology. I particularly thank the KMFRI for providing the research vessels and equipment used in all the field sampling activities and laboratory.
