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- Title
Age, growth, and mortality of the prosobranchZidona dufresnei(Donovan, 1823) in the Mar del Plata area, south-western Atlantic Ocean.
- Authors
Giménez, J.; Penchaszadeh, P. E.; Brey, T.; Mackensen, A.
- Abstract
The volutid snailZidona dufresneiis 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 (,K=0.211 year-1,t0=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 ofZ. dufresneiwas estimated to be 0.61 (±0.21) year-1.
- Subjects
MAR del Plata (Argentina); ARGENTINA; PROSOBRANCHIA; MOLLUSKS; POPULATION dynamics; WATER temperature; MARINE biology
- Publication
Marine Biology, 2004, Vol 145, Issue 4, p707
- ISSN
0025-3162
- Publication type
Article
- DOI
10.1007/s00227-004-1364-0