Morphological Development of Hatchery-reared Larval and Juvenile <I>Pangasius larnaudii</I>

DOI JASI Web Site 28 References
  • Viseth Hav
    Laboratory of Ichthyology, Tokyo University of Marine Science and Technology Fisheries Administration, Ministry of Agriculture, Forestry and Fisheries
  • Ugawa Ryo
    Laboratory of Ichthyology, Tokyo University of Marine Science and Technology
  • Kinoshita Yushiro
    Laboratory of Ichthyology, Tokyo University of Marine Science and Technology
  • Akishinonomiya Fumihito
    Tokyo University of Agriculture
  • Taki Yasuhiko
    Japan Wildlife Research Center
  • Kohno Hiroshi
    Laboratory of Ichthyology, Tokyo University of Marine Science and Technology

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Other Title
  • <I>Pangasius larnaudii</I>（ナマズ目：パンガシウス科）仔稚魚の外部形態の発育
  • Pangasius larnaudii （ナマズ目：パンガシウス科）仔稚魚の外部形態の発育
  • Morphological development of hatchery reared larval and juvenile Pangasius larnaudii

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Abstract

We describe the morphological development of hatchery-reared Pangasius larnaudii using 150 larvae and juveniles 3.42 to 46.7 mm in body length (BL), sampled from day 0 to day 35. BLs of larvae and juveniles on day 0 were 3.53±0.1 mm (mean±SD), reaching 15.9±1.45 mm on day 15 and 39.4±4.03 mm on day 35. Notochord tip flexion began in the smallest larva of 3.42 mm BL, and a completely flexed notochord tip was evident in specimens of about 9 mm BL. Melanophores started appearing in larvae on such body regions as the eyes, ventral contour of the tail, dorsal surface of the gut, anal fin-fold, pectoral symphysis, lower jaw, maxillary barbel, antero-lateral part of the body, dorsal contour of the body and tail, caudal fin base, etc. There were individual variations among larvae as to the appearance of these melanophores, but all juveniles exhibited all of these melanophores. The juvenile stage started at 14.4 mm BL, at which point most of the body proportions relative to BL reached peak or constant values.

Journal

  • Aquaculture Science

    Aquaculture Science 59 (2), 283-297, 2011

    Japanese Society for Aquaculture Science

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