Occurrence patterns and ontogenetic development based on the swimming- and feeding-related characters in larval and juvenile Japanese whiting（<i>Sillago japonica</i>）in the innermost Tokyo Bay, central Japan

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  • ANGMALISANG David E.
    Laboratory of Ichthyology, Tokyo University of Marine Science and Technology
  • IKEGAMI Seiichiro
    Laboratory of Ichthyology, Tokyo University of Marine Science and Technology
  • KOHNO Hiroshi
    Laboratory of Ichthyology, Tokyo University of Marine Science and Technology

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Other Title
  • 東京湾奥におけるシロギス仔稚魚の出現様式と遊泳・摂餌形質の発達
  • Occurrence patterns and ontogenetic development based on the swimming- and feeding-related characters in larval and juvenile Japanese whiting (Sillago japonica) in the innermost Tokyo Bay, central Japan

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Abstract

Occurrence patterns of the larval and juvenile Japanese whiting, Sillago japonica, were investigated in Tokyo Bay by monthly samplings using the following two types of gear: a small seine net towed at three tidal-flat stations around the river mouth of Tama-gawa River from May 2006 to September 2009; and a ring net towed at a station in the offshore water of the Tama-gawa River mouth from January 2006 to May 2008. Their functional development was also observed mainly by osteological characters on the basis of 111 cleared and stained specimens of 2.0-21.1 mm in body length（BL）. Specimens collected from the offshore water were 30 in number with 4.6 ± 1.6（mean ± SD）mm BL, ranging from 2.0 to 8.5 mm BL, and those from the tidal flats were 232 with 15.7 ± 5.6 mm BL from 6.1 to 49.3 mm BL. Based on the functional development of swimming- and feeding-related characters, the larvae and juveniles were divided into five and four developmental phases, respectively. Improvements of swimming and feeding functions observed at about 3 mm BL were considered to assist the early larvae in migrating shoreward, and the specimens of 6.0-8.9 mm size classes occurred in both the offshore and tidal flat stations. Thereafter on tidal flats, the number of individuals increased and reached a peak at about 15 mm BL, when the juveniles acquired functional swimming and feeding abilities. The juveniles > 15 mm BL decreased in number, and then those ca. 30 mm BL had scarcely appeared on the tidal flats. The Japanese whiting juveniles > ca. 30 mm BL in the innermost Tokyo Bay are most likely to move into deeper waters.

Journal

  • La mer

    La mer 57 (1-2), 25-42, 2019

    The Japanese-French Oceanographic Society

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