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Title: Population structure, effort and dye yielding of the snail Plicopurpura pansa (Gould, 1853) in the Mexican Pacific [Estructura de la población, esfuerzo y rendimeinto de tinte del caracol Plicopurpura pansa (Gould, 1853) en el Pacífico mexicano]
Author: Michel-Morfin, J.E.
Chavez, E.A.
Gonzalez, L.
Issue Date: 2002
Abstract: The purple snail (Plicopurpura pansa) is a conspicuous rocky-shore species in the tidal zone of the American tropical Pacific. It is considered a potential resource because of the dye it produces. In the 1980s the snail underwent exploitation in the Pacific coast of Mexico. Samples in 12 rocky shores of the Baja California Sur, Jalisco and Oaxaca states, and the Socorro Island were made, finding a sexual ratio near to 1:1, densities ranging from 0.47 to 1.24 snails m-2 and a relation between dye yield and specimens' length. By interviews with the Mixteco people in Oaxaca and milking of the snails over cotton skeins, dye yield was calculated as 2.5 liters of dye per week/fisherman or 2.2 skeins per week/fisherman.
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