Table 2.

March 2014 resurvey of five Kenya schools to understand long-term impact of Procambarus clarkii on snails capable of transmitting human schistosomiasis

	Experimental schools			Control schools
	Kwandoo	Kataluni	Ikotamwithe	Kisukioni	Nzangathi
Number of crayfish captured	0	0	0	0	0
Number of traps placed	18	18	10	18	8
Snails identified
Number of B. africanus	0	0	0	7	8
Number of B. pfeifferi	0	0	0	0	0
Number of L. natalensis	0	0	0	1	0
Number of B. forskali	44	0	41	0	3
Number of M. tuberculata	0	0	0	0	0
Number of P. acuta	0	0	0	0	0
Number of Gyraulus sp.	0	0	1	0	0

In 1989, P. clarkii was introduced into aquatic habitats with Bulinus snails in three schools, matched with three controls, which did not have crayfish introduced. Human–water contact sites at five of these schools were resurveyed in 2014 for P. clarkii and human schistosome–transmitting snails (Bulinus africanus and Biomphalaria pfeifferi), as well as other species (Lymnaea natalensis, Bulinus forskalii, Melanoides tuberculata, Physa acuta, and Gyraulus sp.).