Slider turtles, Trachemys scripta elegans, released in the natural fie
ld are competitors of European protected turtles. Their reproduction s
hould increase this hazard. Simple intervention of ovariectomy by late
ral way is described. After a note on the physiology and the anatomy o
f chelonians, the intervention is evaluate with care of the place of l
ife (terrarium or semi-natural field) and the ovarian cycle. Two table
s summary the major antibiotics and anesthesics used for chelonians.