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Distribution and biology of Sthenoteuthis oualaniensis in the Indian Ocean - preliminary results from the research cruise of the R/V Shoyo-Maru in 1995
Yatsu, A.; Katto, F.; Kakizoe, F.; Yamanaka, K.; Mizuno, K. (1998). Distribution and biology of Sthenoteuthis oualaniensis in the Indian Ocean - preliminary results from the research cruise of the R/V Shoyo-Maru in 1995, in: Okutani, T. Contributed papers to International Symposium on Large Pelagic Squids, July 18-19, 1996, for JAMARC's 25th anniversary of its foundation. pp. 145-153
In: Okutani, T. (1998). Contributed papers to International Symposium on Large Pelagic Squids, July 18-19, 1996, for JAMARC's 25th anniversary of its foundation. Japan Marine Fishery Resources Research Center: Tokyo. 269 pp., more

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    Marine

Authors  Top 
  • Yatsu, A.
  • Katto, F.
  • Kakizoe, F.
  • Yamanaka, K.
  • Mizuno, K.

Abstract
    The ommastrephid squid, Sthenoteuthis oualaniensis, is distributed throughout the equatarial, tropical and subtropical waters of the Indo-Pacific Region. This pelagic species consists of at least three forms, dwarf, middle-sized and giant. Preliminary results of a research cruise for S. oualaniensis in the Indian Ocean by the Shoyo Maru in 1995 is reported. The Shoyo Maru occupied 31 stations in the area of 4°S-22°N, 54°-96°E during November 5- December 20. At each station, jigging and larvae surveys were conducted. Water temperature, salinity , oxygen, chlorophyll, current direction and velocity, and other parameters were also measured at the above and other stations to elucidate oceanographic features of the research area. Jigging effort at each station varied between 1.5 and 95.9 hr.line (mean 19.0). A tatal of 1,802 individuals of S. oualaniensis were caught, of which 17 were dwarf. Mantle length of all squid ranged from 9 to 49 cm. The giant form was found only in the northern part of the Arabian Sea (14°-22°N) , where extremely low oxygen (0.2 m l/l ) water was observed at the depths of ca. l00-l000m. Ommastrephid paralarvae were collected from most of the stations and were abundant in the northern Arabian Sea and near the Maldive Islands at 6°N.

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