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Mission à bord du Shoyo-Maru 28 septembre -26 octobre 2000

Abstract : This report details the operations carried out by the authors during the first leg of the SY002 expedition of the Japanese research vessel Shoyo Maru of the National Research Institute of Far Seas Fisheries in the central Atlantic, within the framework of the ICCAT BETYP research program on bigeye tuna Thunnus obesus. Water samples were collected at different depths to measure nitrite concentration; stomachs of tuna caught by the horizontal longline, as well as those of associated species, were recovered to be examined in the laboratory; potential tuna prey was searched for by day and night trawling using an IKMT micronekton trawlnet in the deep scattering layer; otoliths from bigeye tuna and yellowfin tuna T. albacares were extracted. The mission was also an opportunity to collect tissue samples from mesopelagic species, including bigeye tuna and blue shark Prionace glauca, for future genetic analysis. During trips at sea, six hours a day were devoted, on average, to the observation of marine fauna (seabirds and cetaceans).
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Contributor : Philippe Borsa Connect in order to contact the contributor
Submitted on : Sunday, May 15, 2022 - 9:10:11 AM
Last modification on : Wednesday, May 18, 2022 - 8:36:07 AM


  • HAL Id : ird-03668497, version 1




Michel Potier, Philippe Borsa. Mission à bord du Shoyo-Maru 28 septembre -26 octobre 2000. [Rapport Technique] Institut de recherche pour le développement. 2000. ⟨ird-03668497⟩



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