One of the largest remaining populations of the southern right whale, Eubalaena australis, breeds along the coast of Península Valdés, inArgentine Patagonia. The area offers excellent opportunities for whalewatching because it is possible, with predictability, to have close-upviews of animals of all ages. During 11 years, from 1987 to 1997, more than 337,000 tourists took part in boat excursions to watch rightwhales. The demand increased during this period over 14 times from 5,214 tourists in

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... 87 to 73,726 in 1997. From 1991 to 1994, morethan 8,000 boat trips were required to satisfy a demand of 125,000 people. Most whalewatching involved pregnant animals or mothers andcalves that often attempted to avoid the boats. In 1997, whalewatching generated direct revenues of at least $US 1 million in boat fees, anddirect plus indirect revenues of over $US 15 million (not including travel costs to Patagonia). The rapid growth of tourism in relation towhales has undisputed economic and public-awareness benefits but it is also raising concern about potentially detrimental effects on theanimals. The lack of a management plan and of estimates of a tourist 'carrying capacity' allows customer demand to be the main drivingforce behind a commercial activity based on this vulnerable species.