Morphological development of eggs, larvae and juveniles of laboratory‐reared Ryukyu‐ayu Plecoglossus altivelis ryukyuensis
Morphological development of eggs, larvae and juveniles of laboratory‐reared Ryukyu‐ayu Plecoglossus altivelis ryukyuensis
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实验室饲养琉球香鱼卵、幼虫和幼鱼的形态发育
DOI：
10.1046/j.1444-2906.2003.00624.x
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发表时间：
2003
影响因子：
1.9
通讯作者：
K. Kawaguchi
中科院分区：
文献类型：
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作者：
K. Tachihara;K. Kawaguchi
摘要/ ABSTRACT摘要：本文以实验室饲养的Ryukyu-ayu Plecoglossus altivelisryukyuensis为研究对象，描述了Ryukyu-ayu Plecoglossus altivelisryukyuensis的胚胎、幼虫和幼鱼的发育过程。卵呈球形，直径0.98 ~ 1.18 mm（平均1.06 mm），有贴壁膜。在19.7 ~ 22.0°C（平均20.7°C）的水温下，受精后的孵育期约为155 h。新孵化幼虫体长5.0 ~ 5.9 mm（平均5.5 mm），肌节59 ~ 62个。孵化后5 d内，幼虫身长达到6.4 ~ 8.2 mm（平均7.8 mm），卵黄完全消耗。脊索屈曲开始于腰宽13.7 mm，至腰宽16.3 mm时结束。原始背鳍、肛门鳍、骨盆鳍和脂肪鳍分别出现在腰宽14.7、16.3、21.8和21.8 mm处。所有鳍片在约28毫米身长时达到相同的固定数量，梳状齿在约30毫米身长时开始形成，在约40-50毫米身长时发育完全，在约40毫米身长时与成年鱼的比例一致。
ABSTRACT: The development of embryos, larvae and juveniles of the Ryukyu-ayu, Plecoglossus altivelisryukyuensis are described based on laboratory-reared specimens.The eggs were spherical, 0.98–1.18 mm (mean 1.06 mm)in diameter with an adherent membrane. The incubation period after fertilizationwas approximately 155 h at a water temperature of 19.7–22.0°C(mean 20.7°C). Newly hatched larvae were 5.0–5.9 mm(mean 5.5 mm) in body length (BL) with 59–62 myotomes.Within 5 days after hatching, the larvae had attained 6.4–8.2 mm(mean 7.8 mm) BL and had completely consumed their yolk.Notochord flexion began at 13.7 mm BL and was completedby 16.3 mm BL. The rudimental dorsal, anal, pelvic andadipose fins appeared at 14.7, 16.3, 21.8 and 21.8 mm BL, respectively.All fin rays reached the same fixed number of adult fish at about28 mm BL. The comb-like teeth began to form at approximately30 mm BL and were fully developed at about 40–50 mm BL.The proportions of P. a. ryukyuensis specimens,which were consistent with adult fish, occurred at approximately40 mm BL.
NISHIDA, M.：“来自琉球群岛的香鱼新亚种，Plecoglossus altivelis（Plecoglossidae）。”
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