Weight variations in females were found related to their reproductive cycle. Snail population was characterized by being small sized and in high densities. In December 2006 and September 2007 a larger frequency of recruits was shown. Recruit- ment occurred for the entire year. Averaged weight was 1.99 g, females showed a coefficient of variation in weight of 96.53%. The best represented sizes in females were from 10.5 to 28.5 mm and in males 13.5 to 28.5 mm. The sea snail species that produce the dye (Hexaplex trunculus, Bolinus brandaris & Stramonita haemostoma ) and the tone. pansa population structure in Costa Chica of the State of Guerrero based in density, sex ratio, size and weight, besides to realize observations on mating and recruitment, for which quarterly sampling was made during an annual cycle in three beaches. Bolinus brandaris, also called sea snail or purple dye murex Thousands of the murex sea snails are required to make 1 gram of Tyrian purple dye, which is unsustainable. Fig 1 - uploaded by Rena Veropoulidou Content may be subject to copyright. This snail inhabits the rocky intertidal zone of Mexican Pacific, is found attached to rocks in crevices and holes. Plicopurpura pansa is a cultural resource with economic importance since ink can be extracted from it to dye clothes. pansa to obtain Tyrian Purple and to collect the snails as a bait for fishery or as a special food for foreigners should.
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