Abstract
To study the growth of the purple snail Plicopurpura pansa at the northern limit of its distribution, from 1999 to 2001 monthly random samples were obtained from two beaches in the southern part of the Baja California Peninsula (Mexico): one on the Gulf of California and the other on the west coast of the peninsula. Mark and recapture experiments, as well as laboratory rearing were also done. The von Bertalanffy growth equation parameters derived from length frequency data were K = 0.17 and L∞ = 90 mm, and agree with those estimated from the mark and recapture data, but are lower that those reported in the literature for P. pansa from the central and southern Mexican Pacific. Snails maintained under laboratory conditions had low growth rates. These results could be used to implement models for the assessment of purple snail fisheries.
Highlights
El caracol de tinte o púrpura de la familia Thaididae, Plicopurpura pansa (Gould, 1853), habita en zonas rocosas intermareales del Pacífico Este, desde el sur de la Península de Baja California, México (Clench, 1947; Keen, 1971), hasta el norte de Perú (Peña, 1970; Paredes et al, 1999) incluyendo las Islas Galápagos
The purple snail of the family Thaididae, Plicopurpura pansa (Gould, 1853), inhabits the rocky intertidal zones of the eastern Pacific, from the southern Baja California Peninsula, Mexico (Clench, 1947; Keen, 1971), to northern Peru (Peña, 1970; Paredes et al, 1999), including the Galapagos Islands. This snail produces a purple dye that has been used for centuries in Central America and Mexico to dye cotton; the clothes made with this fabric have a high commercial value
The objective of the present work is to analyze the growth of P. pansa on the coasts of Baja California Sur, Mexico, in the northern part of its geographic distribution, at two localities with different environmental conditions
Summary
El caracol de tinte o púrpura de la familia Thaididae, Plicopurpura pansa (Gould, 1853), habita en zonas rocosas intermareales del Pacífico Este, desde el sur de la Península de Baja California, México (Clench, 1947; Keen, 1971), hasta el norte de Perú (Peña, 1970; Paredes et al, 1999) incluyendo las Islas Galápagos. The purple snail of the family Thaididae, Plicopurpura pansa (Gould, 1853), inhabits the rocky intertidal zones of the eastern Pacific, from the southern Baja California Peninsula, Mexico (Clench, 1947; Keen, 1971), to northern Peru (Peña, 1970; Paredes et al, 1999), including the Galapagos Islands. This snail produces a purple dye that has been used for centuries in Central America and Mexico to dye cotton; the clothes made with this fabric have a high commercial value. Se han elaborado propuestas para reiniciar su explotación, manteniendo la tradición indígena bajo el concepto de manejo sustentable (Turok y Acevedo, 2000)
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