Catch and Release
Increases in catch rates from rivers with 'catch and release' regulations have been spectacular in many parts of North America, most notably Montana. 'Catch and release' was introduced to New Zealand by visiting American fly-fishers and is a predominant philosophy today, particularly in pristine wilderness rivers.
The 'catch and release' philosophy is in keeping with New Zealand's dedication to conservation and sustainable fishing. Even in non-release areas, many anglers adopt the catch and release principle, or simply bag only their last catch of the day to take home for eating.
When fishing the catch and release method, anglers should realise that prolonged handling decreases the fish's chances of survival. Some tactics to ensure it lives include using tackle strong enough to bring the fish in quickly, so it doesn't get overtired, avoiding damage to the eyes, gills, fins and body, and keeping the fish in the water so it can breathe. If you want to measure the fish, do it against your rod or take a photo holding it in the water. When the fish is released, it should be supported from underneath and let go facing the current. High summer temperatures lessen the fish's chance of survival too, so care should be taken to quickly return fish to the water by gently lowering it in.
The Nelson-based Cawthron Institute has undertaken an interesting study on the effects of 'catch and release' fishing.
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