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Title ミサキウバウオの卵発生およびふ化仔魚
Author(s) 塩垣, 優; 道津, 喜衛
Citation 長崎大学水産学部研究報告, v.32, pp.1-5; 1971
Issue Date 1971-12
URL http://hdl.handle.net/10069/31081
Right
NAOSITE: Nagasaki University's Academic Output SITE
http://naosite.lb.nagasaki-u.ac.jp
1
ミサキ ウバ ウオの卵発生お よびふ化 仔魚
塩 垣 優 ・道 津 喜 衛
Egg Development and Hatched Larva of the Clingfish,
Lepadichthys frenatus*
Masaru SHIOGAKI and Yoshie DOTSU
Five adults of the clingfish, Lepadichthys frenatus WAITE consisting of two
females and three males were collected from the tide pools on the rocky shore
of Nomozaki near Nagasaki (Lat. 32°35.3'N, Long. 129°45.5'E). They were
fed with mosquito larvae, mysises and brine shrimp and kept for spawning
experiment in a flat plastic aquarium during the period from March 29 to
September 19, 1971. A couple, male being 58.2 mm and female 58.3 mm in total
length, spawned in the nest of a Pecten shell set at the aquarium bottom. The
spawned eggs were deposited on the inner side of the shell in one layer and they
were guarded by the male parent. The egg mass consisted of two egg groups
in different developmental stages. One group of 240 eggs was in the morula
stage and the other of 301 eggs in the advanced stage.
The egg are flat ellipsoid in shape, being 1.31 to 1.36 mm in long axis and
1.01 to 1.05 mm in short axis, and each provided with an adhesive pedestal at the
bottom side. It took 142 to 194 hours for the development of eggs from the morula
stage to the hatching at the water temperature changing from 24.0° to 26.0° C.
The newly hatched larva is 4.20 mm in total length, and it is provided with
large eyes, a remnant of yolk, 36 or 37 myomeres, a small air bladder and
characteristic disposition of melanophores and xanthophores on the body.