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Larvae and juveniles of two engraulid species, Thryssa setirostris and Thryssa hamiltonii, occurring in the surf zone at Trang, southern Thailand

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Abstract

 Engraulid larvae and juveniles collected from the surf zone off the Sikao River, Trang, southern Thailand, in the period between August 1999 and September 2000 were identified as Thryssa setirostris (n = 249, 14.1–25.7 mm SL) and T. hamiltonii (n = 731, 15.2–22.2 mm SL), based on the number of lower gillrakers and maxilla morphology. The two species were easily distinguishable by the melanophore pattern distributed on the anterior part of the striated hindgut, T. setirostris possessing three to five melanophores along the ventral midline and T. hamiltonii lacking such melanophores. The ratios of head length and eye diameter to SL also differed between the species, both being higher in T. hamiltonii. The distribution of the two species was limited to the surf zone outside the river mouth, that region being characterized by a higher salinity than the river and its tributaries.

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Authors and Affiliations

  1.  Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan (e-mail: kokikano@sk9.so-net.ne.jp), JP

    Kouki Kanou & Hisashi Kurokura

  2.  Laboratory of Ichthyology, Tokyo University of Fisheries, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan, JP

    Hiroshi Kohno

  3.  Faculty of Science and Fisheries Technology, Rajamangala Institute of Technology, Sikao, Trang 92150, Thailand, TH

    Prasert Tongnunui

Authors
  1. Kouki Kanou
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  2. Hiroshi Kohno
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  3. Prasert Tongnunui
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  4. Hisashi Kurokura
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Additional information

Received: September 27, 2001 / Revised: May 30, 2002 / Accepted: June 28, 2002

Acknowledgments We thank M. Sano, K. Ikejima, M. Horinouchi, T. Yamane, Y. Nakamura, A. Yoshizawa, S. Sugiura, K. Suganuma, H. Yahata, N. Kawakubo, The University of Tokyo, and colleagues of Rajamangala Institute of Technology for assistance in fieldwork. We also thank G. Hardy, Thames, New Zealand, for critical comments on the manuscript, and T. Medeji, Rajamangala Institute of Technology, P. Musikasinthorn, Kasetsart University Museum of Fisheries, and T. Kudo, Fisheries Research Institute of Kanagawa Prefecture, for their support during this investigation.

Correspondence to:Kouki Kanou

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Kanou, K., Kohno, H., Tongnunui, P. et al. Larvae and juveniles of two engraulid species, Thryssa setirostris and Thryssa hamiltonii, occurring in the surf zone at Trang, southern Thailand. Ichthyol Res 49, 401–405 (2002). https://doi.org/10.1007/s102280200062

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  • DOI: https://doi.org/10.1007/s102280200062

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