Pelagic eggs and larvae of Coelorinchus kishinouyei (Gadiformes: Macrouridae) collected from Suruga Bay, Japan |
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Authors: | Atsushi Fukui Munehiro Takami Takao Tsuchiya Keijiro Sezaki Yoji Igarashi Shigeharu Kinoshita Shugo Watabe |
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Institution: | (1) Department of Fisheries, School of Marine Science and Technology, Tokai University, Orido Shimizu, Shizuoka 424-8610, Japan;(2) Shin Nihon Kentei Kyokai, Shinyokohama 2 Chome, Kohoku, Yokohama Kanagawa, 222-0033, Japan;(3) Laboratory of Marine Biochemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan |
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Abstract: | Pelagic eggs and larvae of the macrourid fish Coelorinchus kishinouyei, collected from Suruga Bay, southern Japan and subsequently identified by 16S rRNA gene nucleotide sequences, are described.
The spherical eggs, 1.18–1.31 mm in diameter, contained a single oil globule, 0.28–0.33 mm in diameter, and had hexagonally
patterned ornamentation on the chorion, 0.017–0.022 mm in width. Melanophores were present on the embryo, yolk and oil globule
after the blastopore had closed. Within 1 day after hatching, the body axis of the yolk-sac larvae was bent slightly at the
anterior trunk region. During this stage many melanophores formed on the head, trunk, tail, yolk and oil globule, along with
small irregular wrinkles on the dorsal and ventral finfolds. Pelagic eggs (after the caudal end of the embryo had detached
from the yolk) and yolk-sac larvae also developed xanthophores on the embryo and yolk, and head, trunk, dorsal and ventral
finfolds just before tail tip, and yolk, respectively. The pelagic larvae had a short tail, stalked pectoral-fin base and
no elongate first dorsal and pelvic-fin rays. Three clusters of melanophores were present on the tail (anterior two embedded
to muscle and one just before tail tip subsequently lost with development) and a cluster around the anus (beyond 3.9 mm head
length). Nucleotide sequence analyses of comparative adult specimens appeared to confirm a previous proposal that C. productus is a junior synonym of C. anatirostris. |
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