fish oil rust prevention
Never heard of using fish oil. Seems like hot days and fermented fish oil might make for an interesting stench!
I don't know about Australia having more fish. I meet a lot of Aussies fly fishing in Montana and they say it's their favorite place to fish. My buddy Mick will be in Montana/Idaho area this summer beating up on the fish. He has never mentioned or sent me pictures of trout caught in Australia. He does go to NZ quite often for trout fishing.
Try a Health Food Store or check out Whole Foods on the internet.