Rearing density effect on the production performance of the edible snailHelix aspersa Muller in indoor rearing

摘要

Six different indoor rearing densities (250 to 500 animals per m(2)) were tested. Three repeats were carried out for each density. The following were recorded: feed intake, weight and number of adult individuals (animals with a reflected peristome), non-adult weight at the end of the experiment, and mortality. A simplified calculation of gross margin is also presented. It was observed that, at low densities, the animals consumed more, were bigger and more of them became adults. However, the total amount of biomass produced is greater at higher densities. If the breeder merely fattens the snails, then the gross margin is maximal at a density of 250 animals per m2. If the breeder fattens and cooks his own produce, then the gross margin is maximal at high densities. Compared to the mixed rearing method currently used, the performances observed in this indoor rearing experiment could be improved further (particularly in terms of the percentage of adult animals obtained).