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Ichthyological Research

, Volume 49, Issue 3, pp 224–228 | Cite as

Extremely early maturity found in Okinawan gobioid fishes

  • Takeshi Kon
  • Tetsuo Yoshino

Abstract

 Extremely small animals including fishes have been reported with discussion of the causes and consequences of their miniaturization. Here we demonstrate, for the first time, very early (i.e., 23–60 days old and 42–67 days old) sexual maturity in two groups of gobioid fishes (Schindleria and Paedogobius, respectively) in warm water, based on the otolith increments. The generation time of Schindleria is the shortest known among vertebrates under natural conditions. We discuss the occurrence and evolutionary significance of the progenesis found in gobioid fishes.

Key words Gobioidei Progenesis Warm waters Otolith Daily increments 

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Copyright information

© The Ichthyological Society of Japan 2002

Authors and Affiliations

  • Takeshi Kon
    • 1
  • Tetsuo Yoshino
    • 1
  1. 1.Department of Marine Sciences, Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara Okinawa 903-0213, Japan (e-mail: TY, b985005@sci.u-ryukyu.ac.jp)JP

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