7Ogg J. E., Ryder R. A., Smith H.L. Isolation of vibrio cholerae from aquatic birds in Colorado and utah [ J ]. Applied and Envionmontal Microbiology, 1989(55): 95-99.
8Fenlon D.R. A comparison of salmonella serotypes found in the faeces of gulls feeding at sewage works with serotypes in sewage [J]. Journal of Hygiene, 1983(91 ) :47 - 52.
9Hajek B. F., Boyd C.E. Rating of soil and water information foraquaculture [J]. Aquaculture Engineering, 1994(13): 115-128.
