The measurements are approximate. Make sure there is enough liquid(juice) to cook the fish. I like to use a zip lock bag so the juice gets everywhere, and put it on a flat surface in the fridge. Halfway through the marinating process turn the bag over or if using a bowl, stir it at least once. Also when we were in Fiji the chef told us that when they don't have citrus they use white wine vinegar. We haven't tried it but if your going to, rinse the fish off after and use coconut milk.