Age, growth and mortality in the giant snail Adelomelon beckii (Broderip 1836) on the Argentinean shelf

The marine subtidal volutid snail Adelomelon beckii was studied in order to obtain their population dynamics, particularly on growth, age, mortality and production. Stable oxygen isotope ratios confirmed semiannual formation of internal growth marks. A von Bertalanffy growth model fitted 308 size-at...

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Detalles Bibliográficos
Autores principales: Arrighetti, F., Brey, T., Mackensen, A., Penchaszadeh, P.E.
Formato: JOUR
Lenguaje:English
Materias:
Age
Fisheries Management
Growth
Marine Gastropod
Mortality
Production
age structure
exploitation
fishery management
fishery production
fishing mortality
functional morphology
gastropod
growth modeling
growth rate
isotopic ratio
oxygen isotope
population dynamics
snail
stable isotope
subtidal environment
Argentine Shelf
Atlantic Ocean
Adelomelon
Gastropoda
Volutidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_13851101_v65_n2_p219_Arrighetti
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:The marine subtidal volutid snail Adelomelon beckii was studied in order to obtain their population dynamics, particularly on growth, age, mortality and production. Stable oxygen isotope ratios confirmed semiannual formation of internal growth marks. A von Bertalanffy growth model fitted 308 size-at-age data pairs. A. beckii potential lifespan in Mar del Plata (Argentina) region is 29years, being rather long lived compared to other large gastropods. Total mortality Z and natural mortality M were calculated to be 0.210y-1 and 0.081y-1 respectively. Fishing mortality F amounts to 0.129y-1 corresponding to an exploitation rate E of 0.614, a value much beyond the optimum rate of 0.427. The current exploitation regime will be unsustainable in the long run unless a proper management approach establishes. © 2010.

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