FEEDING DYNAMICS OF ATLANTIC BLUEFIN TUNA (THUNNUS THYNNUS) LARVAE IN THE GULF OF MEXICO
FEEDING DYNAMICS OF ATLANTIC BLUEFIN TUNA (THUNNUS THYNNUS) LARVAE IN THE GULF OF MEXICO
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墨西哥湾大西洋蓝鳍金枪鱼 (THUNNUS THYNNUS) 幼虫的摄食动态
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发表时间：
2015
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通讯作者：
J. Lamkin
中科院分区：
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作者：
J. Llopiz;B. Muhling;J. Lamkin
在我们对墨西哥湾产卵的大西洋蓝鳍金枪鱼幼虫的早期生活史的了解中，一个令人惊讶的差距是对它们的喂养成功和饮食的理解。在这里，我们报告的初步结果，在墨西哥湾两年收集的蓝鳍金枪鱼幼虫的食性和喂养成功。白天摄食率（幼虫肠道中有猎物的比例）可用于指示幼虫成功摄食的程度，总体为94%，长度>4 mm的幼虫为100%。饮食从桡足类无节幼体在最早的阶段，主要由哲水蚤桡足类，枝角类，和approximularians的混合物的猎物类型，最后这些从未被观察到的饮食中的其他蓝鳍金枪鱼物种或地中海产卵的大西洋蓝鳍金枪鱼幼虫。食鱼性（食用其他鱼的幼虫）开始于约6 mm的长度，在71%的8-10 mm长度的幼虫中观察到。在食鱼开始时如此小的尺寸，以及食鱼的高发生率，与地中海的蓝鳍金枪鱼幼虫形成鲜明对比，那里尚未观察到食鱼。恢复
SUMMARY A surprising gap in our knowledge of the early life history of Atlantic bluefin tuna larvae spawned in the Gulf of Mexico has been an understanding of their feeding success and diets. Here we report preliminary results on the feeding habits and feeding success of bluefin larvae collected during two years in the Gulf of Mexico. Daytime feeding incidence (the proportion of larvae with prey in their guts), which can be used to indicate the degree to which larvae are feeding successfully, was 94% overall and 100% for larvae >4 mm in length. Diets shifted from copepod nauplii at the earliest stages to a mixture of prey types that predominantly consisted of calanoid copepods, cladocerans, and appendicularians—the last of these having never been observed in the diets of other bluefin species or those of Mediterranean-spawned Atlantic bluefin larvae. Piscivory (consuming other fish larvae) began at lengths ~6 mm and was observed in 71% of larvae 8-10 mm in length. Such a small size at onset of piscivory, as well as high incidence of piscivory, greatly contrasts with bluefin larvae in the Mediterranean where piscivory has not yet been observed. RESUME