|Effects of three culture densities on growth and survival of Octopus vulgaris (Cuvier, 1797)|
In: Aquaculture International. Springer: London. ISSN 0967-6120; e-ISSN 1573-143X
Culture; Densiteit; Groei; Sterfte; Octopus vulgaris Cuvier, 1797 [WoRMS]; Marien
Culture; Density; Growth; Mortality; Octopus vulgaris
|Auteurs|| || Top |
- Domingues, P.
- Garcia, S.
- Garrido, D.
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 +/- A 194.9 g) were randomly distributed in nine tanks of 2,000 l each (3.6 m x 1.1 m, and 50 cm water depth). Three tanks were stocked with a low initial density of 4 kg/m(3), while three other tanks were stocked with an initial density of 8 kg/m(3), and the remaining three tanks were stocked at an initial density of 15 kg/m(3). 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 +/- A 2A degrees C, and salinity varied between 36 +/- A 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/m(3)) were attained in the higher culture densities after 56 days of the experiment.