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

Abstract

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 29 years, being rather long lived compared to other large gastropods. Total mortality Z and natural mortality M were calculated to be 0.210 y −1 and 0.081 yrespectively. Fishing mortality F amounts to 0.129 y −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. Crown

Age and Growth ofOlivancillaria deshayesiana(Gastropoda: Olividae) in the Southwestern Atlantic Ocean

“…The overall growth performance of O. deshayesiana (P = 3.91) is below the range found for other large commercially important gastropod species from temperate regions (reviewed in Arrighetti et al, 2011).…”

“…The specialized von Bertalanffy model describes the shell growth of O. deshayesiana properly, because it is a gastropod in which shell growth has no inflexion point (e.g., Frank, 1965;Caetano et al, 2003;Ilano et al, 2004;Richardson et al, 2005a;Chatzinikolaou & Richardson, 2008;Eversole et al, 2008;Arrighetti et al, 2011). This is in contrast to other gastropods with a sigmoid pattern of shell growth (e.g., Giménez et al, 2004;Cledón et al, 2005;Bigatti et al, 2007).…”

Life History Parameters in the Edible SnailAdelomelon ancillafrom Patagonian Waters

“…Age, Growth, Production, Mortality and Reproductive Maturity According to isotopic data and the internal A. ancilla we degrowth model, reaching up to 18 years at 150 mm SL in the Golfo Nuevo region. The long lifespan of A. ancilla is comparable to other large gastropods, in particular other Argentine volutid species, for example, 20 years in a 198 mm SL O. magellanica individual (Bigatti et al, 2007), 17 years in a 198 mm SL Z. dufresnei individual (Giménez et al, 2004), 20 years in a 170 mm SL A. brasiliana individual (Cledón et al, 2005a) and 29 years in a 380 mm SL A. beckii (Broderip, 1836) individual (Arrighetti et al, 2011). The Gompertz growth function proposed for A. ancilla Z. dufresnei and O. magellanica, whereas for A. beckii and A. brasiliana pair was the Von Bertalanffy and the Logistic, respectively (Giménez et al, 2004;Cledón et al, 2005a;Bigatti et al, 2007;Arrighetti et al, 2011).…”

“…The use of oxygen stable isotopes (OSI) analysis is proposed as an alternative method for aging shells of gastropods and determining growth rates (Gurney et al, 2005). Epstein et al (1951 established a relationship between seawater temperature and the relative abundance of oxygen stable isotopes in the calcium carbonate of the shells Subsequently, many studies have used OSI to determine growth rates and age for various gastropods (e.g., Panarello, 1987;Geary et al, 1992;Cespuglio et al, 1999;Kennedy et al, 2001;Keller et al, 2002;Cledón et al, 2005a;Giménez et al, 2004;Bigatti et al, 2007;Arrighetti et al, 2011Arrighetti et al, , 2012. The application of this technique is possible when the shell is laid down in isotopic equilibrium with the seawater, the magnitude of the corresponding seasonal oscillations in OSI values are discernible.…”

Historia de vida de <i>Zidona dufresnei</i> Donovan, 1823 (Mollusca: Gastropoda) en la Bahía San Antonio, una especie de creciente interés comercial

“…Debido a su alto costo, en general, en el caso de las especies de gasterópodos argentinos la técnica de isótopos estables se ha aplicado al estudio de un número limitado de individuos (Giménez e t al., 2004 (Urban, 2000). Al igual que en la especie aquí estudiada, Arrighetti (2011) encontró que el volútido A. beckii, pertenece al grupo de caracoles en el que la curva de crecimiento (en tamaño de la concha) no tiene ningún punto de inflexión más allá del año de vida y que su crecimiento puede ser adecuadamente descripto utilizando el modelo von Bertalanffy.…”