Studies on diet of Anguilloid leptocephalus larvae

细头鳗幼虫的食性研究

• 批准号: 05660211
• 负责人: MOCHIOKA Noritaka
• 金额: $ 1.34万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05660211/
• 关键词: Leptocephalus larva; Anguiliformes; Gut content; Diet; Larvacean house; Fecal pellet; Congridae; Muraenesocidae; ウナギ目; 食性; 尾虫類; ハモ; オタマボヤ

Gut contents of 585 letocephali comprising eight species of eels were examined from five families (Congridae, Muraenidae, Muraenesocidae, Nettastomatidae, and Ophichthidae). The larvae belonged leptocephalus(566 specimens)and the early metamorphic stage(19 specimens). Visible gut contents were recognized in 246 individuals among the eight species, regardless of developomental stage. Two kinds of visible objects, transparent(0.4 to1.2mm)and opaaque(20to380mum), were found in the gut of letocephali. From their morphological characteristics, the former and the latter were identified as larvacean houses and zooplankton fecal pellets, respectively. Furthermore, most fecal pellets in the gut were identified as oikopleurid larvacean's fecal pellets. No trace of the many other phytoplankton or zooplankton, which were found with leptocephali in the ambient waters and could be suitable-size food, was found in the gut of any leptocephalus. On the basis of the importance of larvacean houses in the diet of serveral species of leptocephalus larvae, it is proposed that the peculiar, large, fang-like teeth of leptocephali are used for feeding, and evolved to pierce and grasp the mucous houses of larvaceans.

从五个家族中检查了585个letocephali的肠道含量，其中包括八种鳗鱼（控股科，muraenidae，muraenesocidae，nettastomatomatidae和ophichthidae）。幼虫属于瘦素（566个标本）和早期变质阶段（19个标本）。在八个物种中，在246个个体中都认识到可见的肠道含量，而不论发展阶段如何。在Letocephali的肠道中发现了两种可见的物体，即透明（0.4至1.2mm）和不透明的物体（20to380mum）。从它们的形态学特征中，前者和后者分别被确定为幼虫和浮游动物粪便。此外，肠道中的大多数粪便颗粒都被确定为Oikopleurrid幼虫的粪便颗粒。在环境水中发现了许多其他浮游植物或浮游动物的痕迹，可以是合适的食物。根据幼体幼虫饮食中幼体型幼虫饮食中的重要性，建议将瘦肉的特殊，大的，类似牙齿的牙齿用于进食，并进化为刺穿和抓住幼虫的粘液房屋。

项目成果

Tsuguo Otake and Noritaka Mochioka: "Possible food sources of Japanese eel leptocephali" Preliminary Report of The Hakuho Maru Cruise KH-91-4. 55-57 (1994)

Tsuguo Otake 和 Noritaka Mochioka：“日本鳗鱼的可能食物来源”白凤丸游轮 KH-91-4 的初步报告。

Mochioka, Noritaka: "Diet of anguilloid laruae : Leptocephali feed selectively on laruacean houses and fecal pellets" Marine Biology. 125. (1996)

Mochioka，Noritaka：“鳗鱼的饮食：细头鱼选择性地以鳗鱼的房屋和粪便颗粒为食”海洋生物学。

Otake, Tsuguo: "Possible food sources of Japanese eel leptocephali" Preliminary Report of the Hakuho Maru Cruise KH-91-4. 55-60 (1994)

Otake, Tsuguo：“日本鳗鱼的可能食物来源”白凤丸游轮 KH-91-4 的初步报告。

Mochioka, Noritaka and Masashi Iwamizu: "Diet of anguilloid larvae : Leptocephali feed selectively on larvacean houses and fecal pellets" Marine Biology. 125(3). (1996)

Mochioka、Noritaka 和 Masashi Iwamizu：“鳗鱼幼虫的饮食：细头鱼选择性地以幼体房屋和粪便颗粒为食”海洋生物学。

Otake, Tsuguo and Noritaka Mochioka: "Possible food sources of Japanese eel leptocephali" Preliminary Report of the Hakuho Maru Cruice KH-91-4. 55-60 (1994)

Otake、Ttsuguo 和 Noritaka Mochioka：“日本鳗鱼细头鳗的可能食物来源”Hakuho Maru Cruice KH-91-4 的初步报告。