Gametogenic cycle and size at first maturity of the Patagonic edible snail Buccinanops cochlidium from Argentina |
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Authors: | Andrés Averbuj Gregorio Bigatti Pablo E Penchaszadeh |
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Institution: | 1. LARBIM, Centro Nacional Patagónico (CENPAT)–CONICET, Bvd. Brown 2915, U9120ACF Puerto Madryn, Chubut, Argentina 2. Museo Argentino de Ciencias Naturales Bernardino Rivadavia, CONICET, Av. ángel Gallardo 470, 1405, Buenos Aires, Argentina
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Abstract: | Buccinanops cochlidium is a common edible snail from Argentinean shallow waters, which is being consumed locally in north Patagonia. Nevertheless,
there are no policies for their fisheries management. This study provides information about the reproductive cycle and size
at first maturity of B. cochlidium from San José Gulf, Argentina. In this species, the testes seemed to develop mature sperm all year round without a resting
period although resorption was registered after periods of high evacuation (June–November). The occurrence of parasperm in
a nassariid species is reported for the first time in this study. Females showed a clear seasonality, without a resting period,
and proliferation of oogonia throughout the year. Evacuation of mature oocytes measuring over 220 μm occurred mainly in October.
Oocyte evacuation was associated with minimum seawater temperature and increasing daylength. Males developed a penis of functional
size and mature gametes in their testes at 37 mm in shell length (SL) but only began to mate at 65 mm in SL. Females matured
at 80 mm in SL, considering gonad maturity, mating behaviour and oviposition altogether. Female SL at first gonadal maturity
is close to the male maximum SL. The present results are useful when planning fishery policies aiming to prevent the overexploitation
of the resource, if an extensive fishery targeting on this species is developed. In case of this, we propose a fishery based
on an artisanal diving collection of individuals over 82 mm in SL, and avoiding to catch gravid females. |
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