Maturation and Spawning of the Dragonet, <I>Callionymus enneactis</I>, in an Aquarium

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<I>Callionymus enneactis</I> was reared in a tank to observe its spawning behavior.Changes in ovarian tissue were also examined.Females spawned every night for at least seven days.By day, males fought with each other and displayed to females.Males came out of the sandy substrate at about 8: 45 p.m.after a stay of approximately one hour and a half in the sand.The males then enticed females to move out of the sand.Then, the pair rose up in the water to spawn in darkness.Spawning in the tank by two males and 14 females continued for about 45 minutes.The ovary contained eggs in the yolk globule stage and earlier stages just after spawning.These measured less than 0.32mm in diameter.A part of the eggs reached the migratory nucleus or prematuration stage at 18 h after the previous spawning, and was ovulated at 23 h.A comparison of the natural condition of ovaries from fish in the field with the developmental cycle of females in the tank suggested that spawning in nature may have occurred at the same time as observed in the laboratory.
日本魚類学会の論文