ARTÍCULO
TITULO

Effect of population density on snail productivity (Helix aspersa) in an open sky system fed with Swiss chard and a balanced food supplement.

Olga González    
Gladys Pérez Camargo    
Macarena Membiela    
Diana Frezza    
Norberto Bartoloni    
Carlos Vieites    

Resumen

Heliciculture is performed worldwide and has been promoted in Argentina; however, its development  and  expansion  has  been  limited  by  several  factors  that make  it  impossible  to reach  the production volumes necessary  for a commercial scale. Among other  factors,  it has been  impossible  to obtain a high amount of finished product according  to  the  initial density determined  in  the  fattening  stage;  additionally,  difficulty  in maintaining  an  adequate  forage supply has limited snail production. In this study, the influence of snail density using balanced food supply on the final production was studied in an open sky system. Density had no significant effect on the mean final live weight. For snails cultured at densities higher than 200 snail·m-2, the average diameter was lower than for snails cultured at 50 snail·m-2 (low density); however, the difference between the moderate snail density (100 snail·m-2) and the low density was not significant. The highest productivity per unit of surface was about 510 g·m2  (n = 200), which is similar to the amount that heliciculture producers want to achieve and slightly lower than what has been reported previously.  La helicicultura es una actividad practicada en diversas regiones del mundo  que ha sido promocionada en Argentina en los últimos años. Sin embargo, su expansión se ha limitado por diversos factores que han impedido lograr una producción adecuada a escala comercial. Entre estos factores se destacan la imposibilidad de obtener una cantidad adecuada de  producto terminado  y la di?cultad de mantener una oferta forrajera acorde con las necesidades. En el presente trabajo se estudió la in?  uencia de la densidad de cría (50, 100 y 200 caracoles·m-2) y la suplementación con alimento balanceado en la producción  ?  nal de caracoles (Helix aspersa), para un sistema abierto y por unidad de super?  cie productiva. El peso vivo promedio ?  nal no mostró diferencias signi?cativas  para distintas densidades de cría. En la densidad mayor, 200 caracoles·m-1, el diámetro individual fue signi?cativamente  menor respecto a 50 caracoles·m-2 (densidad menor). No se encontraron diferencias signi?cativas entre la densidad media  (100 caracoles·m-2) y la menor. La máxima productividad por unidad de super?  cie fue de 510 g·m-2  (un grupo original de n = 200), cantidad similar a la que pretenden lograr algunos productores helicícolas argentinos y sensiblemente inferior a la extensamente publicitada (1000 g·m-2).

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