Borneo Marine Research Institute, Universiti Malaysia Sabah, Jalan UMS, 88400, Kota Kinabalu, Sabah, Malaysia.
Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia.
Fish Physiol Biochem. 2020 Aug;46(4):1621-1629. doi: 10.1007/s10695-020-00817-5. Epub 2020 May 19.
Oxyeleotris marmorata is an ambush predator. It is known for slow growth rate and high market demand. Farming of O. marmorata still remains a challenge. In order to establish a proper feeding practice to stimulate growth, knowledge of its metabolic processes and cost should be examined. Therefore, this study was designed to investigate the diel osmorespiration rhythms of O. marmorata in response to feeding challenge by using an osmorespirometry assay. The results have shown that oxygen consumption rate of the fed fish was approximately 3 times higher than that of the unfed fish in early evening to support specific dynamic action. Digestion and ingestion processes were likely to be completed within 18-20 h in parallel with the ammonia excretion noticeable in early morning. Under resting metabolism, metabolic oxygen consumption was influenced by diel phase, but no effect was noted in ammonia excretion. As a nocturnal species, O. marmorata exhibited standard aerobic metabolic mode under dark phase followed by light phase, with high oxygen consumption rate found in either fed or unfed fish. It can be confirmed that both the diel phase and feeding have a significant interactive impact on oxygen consumption rate, whereas ammonia metabolism is impacted by feeding state. High metabolic rate of O. marmorata supports the nocturnal foraging activity in this fish. This finding suggested that feeding of O. marmorata should be performed during nighttime and water renewal should be conducted during daytime.
波纹唇鱼是一种伏击捕食者。它以生长缓慢和市场需求高而闻名。养殖波纹唇鱼仍然是一个挑战。为了建立适当的喂养实践来刺激生长，应该检查其代谢过程和成本的知识。因此，本研究旨在通过使用渗透压测定法研究波纹唇鱼对喂养挑战的昼夜渗透呼吸节律。结果表明，傍晚到清晨，摄食鱼的耗氧量约为未摄食鱼的 3 倍，以支持特殊动力作用。消化和摄食过程可能在 18-20 小时内完成，同时在清晨氨排泄明显。在静息代谢下，代谢耗氧量受昼夜节律的影响，但氨排泄没有影响。作为一种夜间活动的物种，波纹唇鱼在黑暗阶段和明亮阶段都表现出标准的有氧代谢模式，无论是摄食还是未摄食的鱼，耗氧量都很高。可以证实，昼夜节律和摄食对耗氧量有显著的交互影响，而氨代谢则受摄食状态的影响。波纹唇鱼的高代谢率支持这种鱼类夜间觅食活动。这一发现表明，应该在夜间喂养波纹唇鱼，而在白天进行水更新。
