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Reproductive mode of the tawny nurse shark taken from the Yaeyama Islands, Okinawa, Japan with comments on individuals lacking the second dorsal fin
Teshima, K.; Kamei, Y.; Toda, M.; Uchida, S. (1995). Reproductive mode of the tawny nurse shark taken from the Yaeyama Islands, Okinawa, Japan with comments on individuals lacking the second dorsal fin. Bull. Seikai Natl. Fish. Res. Inst. 73: 1-12
In: Seikai-ku Suisan Kenkyujo kenkyu hokoku = Bulletin of the Seikai National Fisheries Research Institute. Seikai Regional Fisheries Research Laboratory: Nagasaki. ISSN 0582-415X, more

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  • Teshima, K.
  • Kamei, Y.
  • Toda, M.
  • Uchida, S.

Abstract
    On October 5 1994, two female tawny nurse shark, Nebrius concolor, measuring 280 cm and 272 cm TL were captured in the coastal shallow waters southeast of the Taketomi Island, Okinawa. The 272 cm TL female was pregnant. A 59.5 cm TL embryo found in the uterus had an extraordinarily swollen abdomen. Based on observations on ovaries, egg capsules in uteri and nidamental glands, and the embryo, some of the reproductive aspects are described and the reproductive mode for this species is suggested to be oophagy. Of the six sharks caught in October and November 1994, the three were found to be lacking the second dorsal fin. the occurrence of individuals lacking the second dorsal fin is not rare in the Yaeyama area.

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