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Reproduction and imposex in the edible snail <Emphasis Type="Italic">Adelomelon ancilla</Emphasis> from northern Patagonia,Argentina
Authors:Pablo E Penchaszadeh  Carlos Sánchez Antelo  Soledad Zabala  Gregorio Bigatti
Institution:(1) Facultad de Ciencias Exactas y Naturales, Museo Argentino de Ciencias Naturales Bernardino Rivadavia, CONICET, Universidad de Buenos Aires, Av. ángel Gallardo 470, Buenos Aires, Argentina;(2) Centro Nacional Patagónico CENPAT, CONICET, Blvd Brown 2915, U9120ACV Puerto Madryn, Chubut, Argentina
Abstract:The edible volutid snail Adelomelon ancilla occurs on the Argentine coast and may have the capacity to serve as source of support for local fisheries. However, knowledge of its reproduction is lacking. Over 3 years (from September 2000 to July 2004) we studied the oviposition at Golfo Nuevo, Patagonia by diving. Monthly collections were performed to examine gonadal stages histologically during 2002–2003. Gamete development stages corresponded with the expected period for oviposition occurring from July to November, a time of increasing day length. Oviposition also took place in March when water temperature attained a maximum of 18°C. Following the spawning period, remaining gametes were resorpted in both sexes. Males contained sperm throughout the year, parasperm and eusperm forms were found within the same acinus. Oogonia/oocytes ranged from 20 to 240 μm in diameter during oogenesis. Females commenced laying egg capsules from a shell length of 114 mm. Reproduction is compared with other fishable volutid snails from the Argentine shelf, and suggests the need to apply certain fishing restrictions if the resource begins to be utilized commercially. The imposex condition was found in snails from some shipping areas. The frequency of this condition declined with distance from the port.
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