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Age, growth, and mortality of the prosobranch Zidona dufresnei (Donovan, 1823) in the Mar del Plata area, south-western Atlantic Ocean
Giménez, J.; Brey, T.; Mackensen, A.; Penchaszadeh, P.E. (2004). Age, growth, and mortality of the prosobranch Zidona dufresnei (Donovan, 1823) in the Mar del Plata area, south-western Atlantic Ocean. Mar. Biol. (Berl.) 145(4): 707-712. http://dx.doi.org/10.1007/s00227-004-1364-0
In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793
Peer reviewed article  
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  • Giménez, J.
  • Brey, T.
  • Mackensen, A.
  • Penchaszadeh, P.E.
Abstract
    The volutid snail Zidona dufresnei is a benthic top predator in the Mar del Plata (Argentina) shelf area where it was subjected to unregulated commercial exploitation for more than 20 years. So far there is no stock management, and hitherto even the most basic information on population dynamics of this species is missing. Annual formation of internal shell growth bands visible by x-ray was confirmed by the stable oxygen isotope record in the shell carbonate that reflects seasonal oscillations in water temperature. A Gompertz growth function (SL8=208.84mm, K=0.211 year-1, t 0=5.496) fitted 142 pairs of size-at-age data (30 shells) best. Maximum individual production amounted to 26.8 g shell-free wet mass (SFWM) at 115 mm shell length. Based on a size-frequency distribution derived from commercial catches, annual mortality rate of Z. dufresnei was estimated to be 0.61 (±0.21) year-1.
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