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          |  | Japanese Journal of Ichthyology |  |   
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          |  |  Volome 48, Number 1, May 25, 2001 |  |   
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                      | Review |   
                      | Hybridization and introgression in speciation process of fishes Takahiko Mukai 
                         … 1
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                      | Full Papers |  |   
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                      | Comparison of fish fauna among three types of rice fields in the Chikuma River basin Osamu Katano, Kazumi Hosoya, Kei'ichiroh Iguchi and Yoshimasa Aonuma  … 19
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                      | Fish fauna of the rivers in the Shima Region, Mie Prefecture, Central Japan Taiga Yodo, Tsuyoshi Yamashita, Tetsuya Sado, Izumi Taniyama and Seishi Kimura  … 27
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                      | Arecord of a threadfin, Eleutheronema tetradactylum, from Aomori Prefecture, norther Japan, and description of a newly-regognized diagnostic character for the species (Perciformes: Polynemidae) Hiroyuki Motomura, Hiroshi Senou and Yukio Iwatsuki 
                         … 41
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                      | Clutch size and egg size in three species of Rhinogobius complex dwelling in a single stream Kazuaki Tamada 
                         … 49
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                      | Courtship and spawning behavior of Eleotris oxycephala in an aquarium Toshio Matsuo and Hideki Takahama 
                         … 53
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                      | Book Review  … 58 New Publications  … 59
 Proceedings  … 60
 Editorials  … 67
 Japanese Abstracts  … 68
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