As Zipper said look the eyes, should be clear and not to sunken. This is why I only select/ buy whole fish, fish shop will ussaly clean or fillet for you.
Snapper is often available at my local for around $18 per KG whole. Pan fry snapper is a favourite of mine, fry or BBQ whole, usually $12 per kg but paid $15.50 a couple of days ago
