Effects of three culture densities on growth and survival of <Emphasis Type="Italic">Octopus vulgaris</Emphasis> (Cuvier, 1797) |
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| Authors: | Pedro Domingues Sandra Garcia Diego Garrido |
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| Institution: | (1) Centro IFAPA—Agua del pino, Carretera Punta Umbria Cartaya s/n, 21450 Cartaya, Spain |
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| Abstract: | The purpoase of this research was to test the effects of three culture densities on the growth and survival of Octopus vulgaris. A total of 141 sub-adult octopuses (1,175.4 ± 194.9 g) were randomly distributed in nine tanks of 2,000 l each (3.6 m × 1.1 m,
and 50 cm water depth). Three tanks were stocked with a low initial density of 4 kg/m3, while three other tanks were stocked with an initial density of 8 kg/m3, and the remaining three tanks were stocked at an initial density of 15 kg/m3. Octopuses were all fed frozen squid (Loligo gahi) at 5% body weight per day (%BW/day). The experiment lasted for 70 days. Water temperature varied between 20 ± 2°C, and salinity
varied between 36 ± 1 ppt. During the entire experiment, dissolved oxygen was always >75%, and ammonia was always lower than
0.1 mg/l. No differences in growth or growth rates (between 0.9 and 1.1%BW/day for the three densities) were found. Nevertheless,
mortality was significantly lower for the low density compared to the other two densities tested. Maximum densities in the
culture tanks (>25 kg/m3) were attained in the higher culture densities after 56 days of the experiment. |
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