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Doxa C.K.,Cretaquarium | Doxa C.K.,University of Crete | Divanach P.,Cretaquarium | Divanach P.,Hellenic Center for Marine Research | Kentouri M.,University of Crete
Journal of Experimental Marine Biology and Ecology | Year: 2013

Consumption and digestibility rates of four food items (sea star: Luidia sarcii and Astropecten aranciacus, squid: Nototodarus sloanii, shrimp: Parapenaeus longirostris and fish: Boops boops) by the marine gastropod Charonia seguenzae were studied. The food with the greatest mean daily consumption in wet weight was the sea star with 24.03±2.69. g, followed by fish (11.36±3.74. g), shrimp (9.52±1.21. g) and squid (7.36±2.16. g). Absorption rate was higher when squid was consumed (97.1±3.7%, dry weight) followed by shrimp (93.5±4%), fish (87.8±8.6%) and sea star (45±15.3%). Although squid absorption was higher, due to high consumption rates against sea star and fish, energy input did not differ significantly. Tritons absorbed a large proportion of ash only when consuming sea star. Results indicate that C. seguenzae can adapt well in captivity conditions by efficiently digesting alternative foods. Furthermore, a low metabolism is indicated by its low transit that needs 6 to 8. days to digest food consumed from a single feeding. © 2013 Elsevier B.V. Source


Doxa C.K.,Cretaquarium | Doxa C.K.,University of Crete | Sterioti A.,Cretaquarium | Sterioti A.,Institute of Aquaculture | And 3 more authors.
Journal of Biological Research | Year: 2011

In the present study the reproductive biology of Tonna galea (Linnaeus, 1758) was studied for the first time. In mid-September 2006 one individual was found laying a pale pink egg rosette of 39.5 cm length. Number of embryos, stages of development, shape and dimensions were studied in relation to time and measured on microphotographs of randomly sampled capsules. Each oval or spherical shaped capsule of 3.61 mm total length contained 101 developing embryos. The embryo diameter ranged from 297.5 μm of the unsegmented egg to 489 μm of the free veliger. At 21°C eclosion occurred 34 days after capsule deposition, at a free-swimming veliger stage. The duration of each developmental stage, from one cell to veliger, is reported. Results are discussed in relation to possible culture and use for ecological purposes. Source

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