Hey thanks for all the replies, as ive sold the fish on trademe I have gone with fastways its alot easier they'll come to me pick them up and the lady on the phone actually had some idea about shipping fish (didn't just go quiet like the nzpost lady and sorta say "why would you?") She even said it would have to be in a poly box try and use heatpads etc, so sounds good all the other recommendations for them sound positive as well.