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The sight of two dolphins twisting playfully in the murky waters of the Mekong river elicits barely stifled squeals of delight from a boatload of eco-tourists.

But a short distance upstream, river guard Pech Sokhan sighs as he holds up two large, tangled gill nets recently pulled from the murky water—evidence old habits die hard despite a ban on the practice that ensnares many dolphins.

"We have to keep educating people every day," said Pech, one of 77 unarmed guards who patrol the Cambodian stretch of the Mekong river on the lookout for activities that could harm the dolphins.