The dissolved oxygen level is an essential parameter for defining water quality in aquaculture. However, the optimal values of this gas can vary greatly depending on the species, body weight, or water temperature. In this study, different oxygen level categories (optimal, suboptimal, dangerous, and lethal) were established for Octopus vulgaris (0.18–2.20 kg; 15.5–27.4 °C) according to ventilatory frequency ( V f ) and oxygen consumption (MO 2 ) in response to gradually decreasing dissolved oxygen levels. Initial and maximum ventilatory frequency ( V f0 and V fmax , respectively) and oxygen saturation at which ventilatory frequency is altered ( S Vf ) showed mean values of 17.7±3.29 bts/min, 33.3±5.86 bts/min, and 62.8±15.94% (4.5±0.95 mgO 2 /l), respectively, and all variables were positively correlated with temperature ( P <0.05). The species in question maintained a constant MO 2 rate regardless of the concentration of dissolved oxygen, until a critical oxygen saturation ( S crit ) was reached. The S crit showed a mean value of 31.6±8.32% (2.3±0.57 mgO 2 /l) and was correlated positively with temperature ( P <0.05). In the ideal range of temperature for growth and food intake (17–20 °C), our findings suggest an optimal oxygen saturation of between 100% and 65% (constant V f and MO 2 ), a suboptimal value of 65–35% (altered V f but not MO 2 ), with anything below 35% being dangerous (altered V f and MO 2 ). Lethal oxygen saturation levels were lower than 11% in all the animals tested, although resistance was higher at low temperatures and in small animals. We conclude that suitable oxygen levels for O. vulgaris are highly variable and depend on water temperature rather than body weight.
Aquaculture – Elsevier
Published: Feb 28, 2005
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