人工繁殖下で確認されたハカタスジシマドジョウの繁殖行動

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タイトル別名
  • Mating behavior of <i>Cobitis striata hakataensis</i>, confirmed under artificial breeding

説明

Mating behavior of Cobitis striata hakataensis Nakajima, 2012 (Hakata-suji-shima-dojyô) was observed in the laboratory by inducing spawning of females with human chorionic gonadotropin (HCG). The observed mating behavior of C. s. hakataensis was similar to that reported for other loach species/ subspecies. Mating activities commenced approximately 9 hours after HCG administration and were described in five phases. phase 1, the male chases the female (tracking); phase 2, the male swims parallel to the female with his head close to the pectoral or pelvic fin, and when the female stops, he pecks her near the pectoral fin with his head (approaching and parallel swimming); phase 3, the male wraps around the female (amplexus); phase 4, the female spawns just before the end of the amplexus (spawning); phase 5, male leave female (separation). Amplexus was observed seventeen times, of which thirteen times were observed to spawning. The time between amplexus and separation was 1.90 seconds.

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