
let us know when the positions are filled

nothing wrong with limiting jobs to your nationals / natives. It's done all the time, like in Russia, and even that weird place called Alaska

Have to admit that the meany posts are informative. Lots of details need to be provided before signng a contract:
workman's comp or equivalent?
safety data sheets for the chmicals being used?
what types of chemicals are being used?
liability if fish die after cleanings?
finalized scope of work
picture of intended living quarters and location
etc etc.