Predictably, the high demand for crab resulted in a gradual but incremental decline in the Birgus population across North Vanuatu, and led to a visible depletion of this creature's numbers in the Torres group. Consequently, various concerned individuals and groups successfully pressured the local provincial government of SanMa (the province in which Luganville is located) to declare a temporary ban on the sale, purchase or consumption of crab in that province. This ban first took effect in the first semestre of 2004 and is intended to be lifted sometime in early 2008. In the meantime, exports of crab from the Banks and Torres Islands (i.e. TorBa Province) to Port Vila is regulated through a relatively inefficient scheme of "open" and "closed" seasons and intra-regional quotas. Languages Two closely related yet distinct languages are spoken in the Torres group: Hiw and Lo-Toga. Hiw is spoken by the population (about 280 people) of the sole island of Hiw. Lo-Toga is spoken on the southern parts of the Torres, essentially on the islands of Lo and Toga (about 580 people); it consists of two very close dialect varieties, Lo and Toga (note that Toga is sometimes used as a cover term for the two dialects). There is no mutual intelligibility between Hiw and Lo-Toga, but many Hiw speakers are bilingual. Hiw and (Lo-)Toga belong to the East Vanuatu languages, a subgroup of the Oceanic family. As is the case for most unwritten languages of Vanuatu, no detailed description has ever been published yet on them. In 2004 the linguist Alexandre François undertook the first descriptive study of these two languages, which is currently in progress. Culture The islanders divide themselves ethnically into essentially two groups, matching their linguistic division. The cultural differences existing within the Torres Is., at least in the perception of the islanders, essentially match language boundaries: that is, two groups are recognised — the 'people of Hiw' vs the 'people of Toga'; however, a secondary, less essential division is drawn between the two populations of Lo and Toga. The islanders were first described in very general - and not always accurate - ethnographic terms by W. J. Durrad at the beginning of the twentieth century (fragments of Durrad's notes were eventually published in the 1940s), and have been the bailiwick of the anthropologist Carlos Mondragón since 1999. Today the inhabitants of the Torres Islands continue to follow to the same