LIFE HISTORY PARAMETERS IN THE EDIBLE SNAIL ADELOMELON ANCILLA FROM PATAGONIAN WATERS

ZABALA, SOLEDAD; PENCHASZADEH, PABLO E; PANARELLO, H. O.; BROGGER, M; BIGATTI, GREGORIO

MALACOLOGIA

INST MALACOL

Lugar: Philadelphia; Año: 2013

0076-2997

Life history parameters as size-age, production, mortality, and size at reproductive maturity were studied on the edible snail Adelomelon ancilla being useful as management data. Stable oxygen isotope ratios confirmed semiannual formation of internal growth marks. Adelomelon ancilla could reach up to 20 years at a size of 170 mm, fitting to a Gompertz growth model. Size at which 50% of the population matured was 73.5 mm in males (7 years) and 93.5 mm in females (9 years). The long lifespan of this species is comparable to other large gastropods, in particular volutids from Southern-Atlantic Ocean. Longevity, low somatic production, low population density, late reproductive maturity and direct development with few embryos, makes A. ancilla a vulnerable resource that will require a proper management approach incorporating estimates of these life history parameters.