author(s)
Armein Lusi Zeswita, Vivi Fitriani, Nursyahra, Elza Safitri and Irdawati

abstract
Corbicula sumatrana is a shellfish which known by people with the name Lokan. Lokan consumed by people as a source of animal protein and animal feed ingredients. Singkarak Lake is used by people in daily life from the source of drinking water, toilets, fisheries, irrigation, Hydroelectric Power Plant and Tourism. Many activities of the community could be expected to cause pollution and affect the C. sumatrana become vectors of biotoxin because his diet is filter-feeder. Lokan meat is an excellent medium for bacterial growth. This study aims to determine the presence of Escherichia coli and Salmonella sp. on fresh meat shelfishes (C. sumatrana) originating from Singkarak Lake. The research was conducted in April–August 2015 and January –April 2016. This research is a descriptive method, by looking at and analyzing the presence of microorganisms are bacteria E. coli and Salmonella sp. The method used to determine the bacteriological quality of the meat is Lokan by MPN method and examination of Salmonella. Data were analyzed by calculating the number of bacteria E. coli by observing the number of positive results of the estimation of presumptive test, confirmative test and completed test. The next number of bacteria from each positive results are matched with MPN table. Salmonella sp. Test was done by looking at the colony grows. The results of bacteriological tests on meat samples were examined in BAPELKES Padang showed that of the four samples tested, three of which were negative for the bacteria E. coli samples take in Nagari Singkarak and samples contained negative for Salmonella sp. Of this study is suggested to consumers that cooking shellfishes perfectly, to avoid diseases that may occur because it is caused by bacteria.