Development of embryos and larvae in the common Japanese conger Conger myriaster |
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Authors: | NORIYUKI HORIE TOMOKO UTOH YOSHIAKI YAMADA AKIHIRO OKAMURA HUAN ZHANG NAOMI MIKAWA ATSUSHI AKAZAWA SATORU TANAKA AND HIDEO P OKA |
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Institution: | IRAGO Institute, 377 Ehima-Shinden, Atsumi, Aichi 441-3605, Japan |
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Abstract: | Development of embryos and larvae in the common Japanese conger Conger myriaster was observed after artificial fertilization. Eggs were obtained from females matured artificially by hormone injections and milt was obtained from males matured naturally. Fertilized eggs were kept in seawater at 12–14°C. The first cleavage occurred at 4 h, epiboly began at 24 h, the embryonic body was formed at 38 h and hatching occurred at 84 h after insemination. Newly hatched larvae were approximately 2.5 mm (total length) and similar to those of Anguilla japonica in terms of external features. The mouth and anus opened on the 7th day after hatching. Pigments began to appear at the tip of the tail on the 10th day. The total length of the larvae reached approximately 8 mm on the 11th day. Eye pigmentation began on the 14th day. One larva lived for 19 days without food. |
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Keywords: | common Japanese conger egg embryonic development larva |
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