水槽内で観察されたシロボシテンジクザメの交尾, 産卵行動および孵化仔魚
1998 年 45 巻 1 号 p. 29-35
詳細
1998 年 45 巻 1 号 p. 29-35
Mating, the spawning cycle, embryonic development and growth of the white spotted bamboo shark, Chiloscyllium plagiosum, were observed in an aquarium. Mating, which continued for about five minutes, was observed twice in February and May, 1993. Premating behavior included the male shark swimming with the female for thirty minutes, biting the pectoral fin of the latter. From spring to summer, two eggs were deposited at each spawning, the latter occurring every 6 or 7 days on average. After mating, the female shark was separated from the male. Fertilized eggs were produced for about two to five months after copulation, apparently due to sperm storage and delayed fertilization. The average hatching period was 128.2 days. The total length and weight of young at birth averaged 16.6 mm, and 15.5 g, respectively, the former reaching 30 cm after one year.
