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CHEN Ming-ru, QIU Shu-yuan, YANG Sheng-yun. The reproductive biology of the spadenose shark, Scoliodon laticaudus, from southern Fujian coastal waters[J]. Haiyang Xuebao, 2001, 23(3): 92-98.
Citation: CHEN Ming-ru, QIU Shu-yuan, YANG Sheng-yun. The reproductive biology of the spadenose shark, Scoliodon laticaudus, from southern Fujian coastal waters[J]. Haiyang Xuebao, 2001, 23(3): 92-98.

The reproductive biology of the spadenose shark, Scoliodon laticaudus, from southern Fujian coastal waters

  • Received Date: 1999-12-06
  • Rev Recd Date: 2000-05-23
  • The reproductive biology of spadenose shark is studied,the main objective is to provide scientific basis for resources protection and fisheries management.The main results are as follows:The size at sexual maturity is 382~448 mm in total length for males and 405~467 mm for females.Sex ratio of the adult population is 1.13:1(♀:♂).The pregnancy begins from January to April,the parturition occurs in June to August.The gestation is short (5~6 month).Litter size in one uterus ranges from 1 to 12,in 67.8% of specimens,there are 3~6 embryos.Litter size in two uteri ranges from 2 to 24,with a mean of 9.1,there are 6~13 embryos in 70% of specimens.The number of embryos in 57% of the females is the same.The number of embryos per-litter increases with adult length.The reproductive cycle is about 2 a and the female reproduces 2~3 times in the whole life. Young are born at a size of about 138~142 mm in total length,and it is about 30%~35% of the size at maturity.The sex ratio of embryos is 1.17:1(♀:♂).The situation of embryonic development in the one or in both uteri is the same.The problems on resources protection and fisheries management are discussed.
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