Abstract

The gasteropod Melongena crowns bispinosa represents a source of work for the inhabitants of Chubumá Yucatan, Mexico, where artisanal fishing is conducted through the year. Seventy percent of the population (1,000 inhabitants) make the fishing of this snail, extracting in average 3 kg of pulp per person in a day of 5 hours giving a total of 40 tons annual of alive weight and the capture of 12 million organisms. In this work the effect two diets, at three ration levels, was determined on the growth and survival of Melongena crowns bispinosa. These were: soft tissue of the marine clam Polymesoda, that is the natural food of these organisms and the second was tilapia feed. The rations were provided to 3 %, 6 % and 9 % of the meat biomass of the organisms. The rates of daily growth in length terms of heliconcha of M. crown bispinosa fed with the clam were: to 3 %,32 mm/día and 4 µg/día in total wet weight. To 6 %, 28 mm/día and 5 µg/día and to 9 %, 29 mm/día and 6 µg/día. With the food for tilapia, the obtained rate of growth was equal for the three rations, being of 12 mm/día and 3 µg/día. The greater survival was obtained with organisms fed with food for tilapia at 6 %. It was made the analysis between diets and rations with different physiological índices from condition. M crowns bispinosa has characteristics adapted for their handling, contributing some of the bases for a culture program to enhance yield.

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