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Naïve fish: Easy targets for spear fishers
Date:11/13/2012

Big fish that have grown up in marine reserves don't seem to know enough to avoid fishers armed with spear guns waiting outside the reserve.

The latest research by an Australian team working in the Philippines into the effects of marine reserves has found there is an unexpected windfall awaiting fishers who obey the rules and respect reserve boundaries in the form of big, innocent fish wandering out of the reserve.

"There are plenty of reports of fish, both adults and juveniles, moving out of reserves and into the surrounding sea. Having grown up in an area where they were protected from hunting, we wondered how nave they would be with regard to avoiding danger from humans," says Fraser Januchowski-Hartley of the ARC Centre of Excellence for Coral Reef Studies.

The answer is: pretty nave. "Educated fish normally turn tail and flee when a diver armed with a spear gun approaches within firing range of them. The typical flight distance is usually just over four metres," he explains.

"However in our studies of marine reserves in the Philippines, Vanuatu and Papua New Guinea, where spearfishing remains a major way of harvesting table fish, we discovered that reserve-reared fish were much less wary and allowed people to get much closer.

"The fish are literally more catchable."

The team studied fish across the boundaries of marine reserves from 200m inside the protected areas to 200m into the fished areas. They used underwater markers and measuring tapes to measure the 'flight initiation distance' of fish targeted locally by spearfishers. This indicates how close a skin diver can approach to a large fish before it decides to turn and flee.

They found that target fish living in fished areas were typically much warier of divers, and took flight at distances a metre or two further away, than ones living within the reserve.

They also established that the 'naivete radius', whereby more catchable fis
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Contact: Nick Graham
Nick.Graham@jcu.edu.au
61-074-781-6291
ARC Centre of Excellence in Coral Reef Studies
Source:Eurekalert

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