This study verifies the food assimilation of a carnivorous teleost in different timescales (weeks vs months) and evaluates how it uses the food sources. The target species is the adult ribbonfish, Trichiurus lepturus, a voracious teleost caught in commercial fisheries off south-east Brazil (21°S–22°S). The isotope models indicated Chirocentrodon bleekerianus as the main food in the ribbonfish diet in the last weeks (liver: 38.5%; 95% credible intervals: 3.4–73.9%) and last months (muscle: 36.2%; 95% credible intervals: 3.4–68.7%). The contribution of other food sources ranges from 10–16% (liver) and from 10–20% (muscle). Food assimilation remains similar at different timescales. The isotope models suggested a strong and long-lasting association of the adult females of ribbonfish with coastal waters along the study area.

中文翻译：

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通过稳定同位素分析研究肉食性硬骨鱼的食物同化：以巴西东南部带状鱼为例

本研究验证了肉食性硬骨鱼在不同时间尺度（周对比个月）并评估它如何使用食物来源。目标物种是成鱼，松毛虫，一种贪婪的硬骨鱼，在巴西东南部 (21°S–22°S) 的商业渔业中捕获。同位素模型表明长尾龙在过去几周（肝脏：38.5%；95% 可信区间：3.4–73.9%）和最后几个月（肌肉：36.2%；95% 可信区间：3.4–68.7%）作为带状鱼饮食的主要食物。其他食物来源的贡献范围为 10-16%（肝脏）和 10-20%（肌肉）。食物同化在不同的时间尺度上保持相似。同位素模型表明，带鱼的成年雌性与研究区沿岸水域之间存在强烈而持久的关联。