Influence of fish size and water temperature on the metabolic demand for oxygen by barramundi, Lates calcarifer (Bloch), in freshwater
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Conclusions
The relationships between the key factors of water temperature and fish live-weight on oxygen demand are relatively clear. A multi-factorial functional equation was derived based on the data and can be used to estimate gross oxygen consumption (GMR) for any fish live-weight and at any temperature, within reasonable practical constraints.
This work could be further enhanced by an improved understanding of the implications of dietary energy density intake on oxygen consumption (Jobling & Davis 1980). However, the specific value of this may be dependent on dietary energy type also provided (i.e. protein, lipid and carbohydrate components) and there are also implications for feeding activity to be considered. In addition, an evaluation of the influences of sub-optimal water oxygenation on not only GMR but also fish growth and feed intake would also be valuable in estimating the production cost of hypoxia on barramundi performance.
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Conclusions
The relationships between the key factors of water temperature and fish live-weight on oxygen demand are relatively clear. A multi-factorial functional equation was derived based on the data and can be used to estimate gross oxygen consumption (GMR) for any fish live-weight and at any temperature, within reasonable practical constraints.
This work could be further enhanced by an improved understanding of the implications of dietary energy density intake on oxygen consumption (Jobling & Davis 1980). However, the specific value of this may be dependent on dietary energy type also provided (i.e. protein, lipid and carbohydrate components) and there are also implications for feeding activity to be considered. In addition, an evaluation of the influences of sub-optimal water oxygenation on not only GMR but also fish growth and feed intake would also be valuable in estimating the production cost of hypoxia on barramundi performance.
www.cachemgiong (Xem toàn bộ tại liệu tại đây)