the marlin are well worth chasng here although there is no formal catch and release, you are likely to be lured into a dark alley and beaten if you dont. In NZ you would not dream of chasing marlin with a flyrod, such an exercise is equivilent to stopping a train with a cardboard box. The marlin generally weigh 600 lb upwards, even YFT would be too much for any flyrod on the market. US marlin are named by kiwi anglers as "toothpicks" and if two people can pick it up, its too small. If you come to NZ with the intention of flyfishing for marlin, forget it. Other FFF and SWFF opportunities are boundless.