anti-shark
adjective
an·ti-shark 
ˌan-tē-ˈshärk,
ˌan-tī- variants or less commonly antishark
: serving or intended to repel sharks : providing protection against shark attacks
an anti-shark cage
The support boat was equipped with a special antishark electromagnetic field that in theory repelled the animals from a twenty-five-foot radius …
William H. Longyard
William H. Longyard
Word History
First Known Use
1905, in the meaning defined above