Quantitative evaluation of metabolism and body mass in yolk-sac larvae of Japanese whiting, Sillago japonica
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Understanding the early developmental physiology of marine fish larvae is crucial for elucidating their ecological adaptability and survival strategies. This study investigates the metabolic changes in Japanese whiting (Sillago japonica) yolk-sac larvae over the first four days post-hatching. Larvae were incubated under controlled laboratory conditions, and daily measurements of oxygen consumption rate (QO?), wet and dry body mass, and water content were conducted using in vitro pooled samples. The results reveal a gradual increase in absolute oxygen consumption and body mass, accompanied by a consistent wet-to-dry mass ratio, except for a transient increase on the third day. Although individual measurements were not feasible due to the minute size of the larvae, the internal consistency of pooled data supports the observed physiological trends. These findings offer novel insights into the physiological trajectories of Japanese whiting Yolk-sac larvae and provide a foundational dataset for future research on yolk-sac larval energetics and environmental sensitivity in coastal marine fishes.
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