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首页> 外文期刊>Marine biology >Maturation of the digestive system of Downs herring larvae (Clupea harengus, Linnaeus, 1758): identification of critical periods through ontogeny
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Maturation of the digestive system of Downs herring larvae (Clupea harengus, Linnaeus, 1758): identification of critical periods through ontogeny

机译：Downs鲱鱼幼虫消化系统的成熟（Clupea Herengus，Linnaeus，1758）：通过肿瘤发育鉴定关键时期

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Digestive system functionality is a key process linked to larval recruitment and survival. However, little is known about organ development and enzyme maturation of the digestive system of North Sea Atlantic herring (Clupea harengus). In this study, herring larvae were reared at 13 °C from hatching to 69 day post hatch, covering four developmental stages: (1) yolk sac (8–9 mm), (2) pre-flexion (9–14 mm), (3) flexion (12–18 mm) and (4) post-flexion stages (15–30 mm). Combined histological (semi-quantitative scoring) and enzyme analyses (pancreatic and intestinal) showed that developmental stages are strongly linked to physiological changes. The larvae lack a functional stomach and use the intestine as the primary site of digestion which is mainly supported by pancreatic enzyme activity. The intestine acquired adult enzymatic digestive features with a functional brush border at the end of the flexion stage and pyloric ceca started to develop during the post-flexion stage. The transition from pre-flexion to flexion stage and the end of the post-flexion stage are energetically taxing periods as indicated by a reduced number and size of liver vacuoles. Based on these findings, we consider these moments as critical periods, where herring larvae could be dramatically affected by suboptimal feeding conditions in the field. This implies that pre-flexion stage larvae with low or no liver reserves may not be able to proceed to the next developmental stage. Hence, the level of energy storage in first-feeding larvae needs to be examined for its use as a field indicator of survival and development.
机译：消化系统功能是与幼虫招聘和生存相关的关键过程。然而，关于北海大西洋鲱鱼（Clupea Harengus）的消化系统系统的器官发育和酶成熟几乎是知之甚少。在这项研究中，鲱鱼幼虫在13℃下饲养到孵化后的69天孵化，覆盖四个发育阶段：（1）卵黄囊（8-9毫米），（2）预屈曲（9-14毫米）， （3）屈曲（12-18毫米）和（4）后屈曲级（15-30毫米）。结合的组织学（半定量评分）和酶分析（胰腺和肠道）表明，发育阶段与生理变化强烈连接。幼虫缺乏功能性胃，并使用肠道作为消化的主要部位，主要由胰酶酶活性支持。肠道在屈曲阶段结束时用功能刷边缘的成人酶消化特征获得，并且在弯曲后阶段开始发展幽门CECA。从预屈曲到屈曲阶段的过渡和后屈曲阶段的末端是能量征收期限，如肝脏空泡的减少数量和大小所示。基于这些发现，我们认为这些时刻作为关键时期，其中鲱鱼幼虫可能受到该领域的次优喂养条件的显着影响。这意味着具有低或没有肝脏储备的预屈曲阶段幼虫可能无法进入下一个发展阶段。因此，需要检查第一喂养幼虫中的能量储存水平，以便用作生存和发育的场指示剂。

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  • 来源
    《Marine biology》 |2021年第6期|82.1-82.15|共15页
  • 作者

    Léa J. Joly; Christophe Loots; Cédric L. Meunier; Maarten Boersma; Sophie Collet; Valérie Lefebvre; José-Luis Zambonino-Infante; Carolina Giraldo;

  • 作者单位

    English Channel and North Sea Research Unit Ifremer Boulogne-sur-Mer France|Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung Biologische Anstalt Helgoland Helgoland Germany;

    English Channel and North Sea Research Unit Ifremer Boulogne-sur-Mer France;

    Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung Biologische Anstalt Helgoland Helgoland Germany;

    Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung Biologische Anstalt Helgoland Helgoland Germany|FB2 University of Bremen Bremen Germany;

    Ifremer Univ Brest CNRS IRD LEMAR 29280 Plouzané France;

    English Channel and North Sea Research Unit Ifremer Boulogne-sur-Mer France;

    Ifremer Univ Brest CNRS IRD LEMAR 29280 Plouzané France;

    English Channel and North Sea Research Unit Ifremer Boulogne-sur-Mer France;

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