The present study is a valuable contribution to the knowledge of feeding habits of Patagonian toothfish Dissostichus eleginoides in Southwestern Atlantic (53–55°S, 351 to 1073 m depth) near Burdwood Bank/Namuncurá marine-protected area, where diet has not been previously investigated. Based on stomach content analyses of 441 specimens ranging from 38 to 190 cm total length (TL), our study tested the hypotheses that diet was influenced by TL, sex, maturity stage, depth, and region, using generalized linear models and information theory selection criteria. The Patagonian toothfish fed primarily on fish (morid cod Notophycis marginata, myctophids, rattails Macrourus holotrachys and Coelorinchus fasciatus, notothenids Patagonotothen ramsayi, and hoki Macruronus magellanicus), followed by cephalopods (Onykia ingens, Doryteuthis gahi) and shrimps (Acanthephyra pelagica). One case of cannibalism was recorded. The trophic level was 4.57 (4.22 juveniles, 4.78 adults). The pelagic fish and bathypelagic shrimp were more consumed in the east region, whereas demersal fish and cephalopods were more consumed in the west one. Ontogenetic dietary changes associated with TL and maturity stage were reported: pelagic fish and shrimp A. pelagica had the main importance in the diet of intermediate-sized toothfish, reinforcing the hypothesis that juveniles exhibited a bento-pelagic behavior. Demersal fish were more heavily consumed by juvenile specimens, and the size of demersal fish predated by Patagonian toothfish increased according to the predator TL. Cephalopods were more consumed by adults. The preference of sexually mature specimens for cephalopods could have a positive effect on spawning and egg quality.

中文翻译：

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巴塔哥尼亚牙鱼 Dissostichus eleginoides 的饮食，这是西南大西洋的一种深海顶级捕食者

本研究对了解巴塔哥尼亚牙鱼 Dissostichus eleginoides 在 Burdwood Bank/Namuncurá 海洋保护区附近的西南大西洋（53-55°S，351 至 1073 m 深度）的摄食习性做出了宝贵贡献，该地区以前没有饮食调查。基于对 441 个总长度 (TL) 38 至 190 厘米样本的胃内容物分析，我们的研究使用广义线性模型和信息论选择检验了饮食受 TL、性别、成熟阶段、深度和区域影响的假设标准。巴塔哥尼亚牙鱼主要以鱼类（morid cod Notophycis marginata、myctophids、鼠尾鱼 Macrourus Holotrachys 和 Coelorinchus fasciatus、notothenids Patagonotothen ramsayi 和 hoki Macruronus magellanicus）为食，其次是头足类（Onykia ingens Doryteuthis gahi）和虾（Acanthephyra pelagica）。记录了一个同类相食的案例。营养级为4.57（幼鱼4.22，成鱼4.78）。东部地区以中上层鱼类和深海虾为主，西部地区以底层鱼类和头足类为主。据报道，与 TL 和成熟阶段相关的个体发生饮食变化：远洋鱼和虾 A. pelagica 在中型牙鱼的饮食中占主要地位，强化了幼鱼表现出便当中上层行为的假设。幼鱼更大量地消耗底层鱼，而被巴塔哥尼亚齿鱼捕食的底层鱼的大小根据捕食者 TL 增加。头足类动物更多地被成年人食用。