著者

田北 徹 川口 和宏 増谷 英雄

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.34, no.4, pp.497-503, 1988-02-25 (Released:2010-06-28)

参考文献数

7

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Distribution of the salangid fish, Neosalanx reganius Wakiya et Takahasi was investigated in the rivers around Ariake Sound which is located in western Kyushu. They were only found in the Chikugo River and the Midori River located about 50km apart from each other and were regarded to be endemic to those rivers. They inhabit the tidal area of the downstream occur-ring mainly in fresh water, although some are found in the waters having low seawater con-centration near the mouth of the rivers. Morphological examination revealed no meristic difference, but some statistically significant differences in the body proportions between the two populations indicating their entire isolation from each other.

著者

森川 晃 川上 弘 田北 徹

出版者

Japanese Society for Aquaculture Science

雑誌

水産増殖 (ISSN:03714217)

巻号頁・発行日

vol.50, no.3, pp.271-277, 2002-09-20 (Released:2010-03-09)

参考文献数

14

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1998年4月から2000年4月に島原半島沖の有明海で漁獲されたマゴチ603尾とヨシノゴチ263尾について, 耳石薄片標本により年齢と成長の解明を試みた。耳石輪紋形成時期は両種とも年1回, マゴチでは6~7月, ヨシノゴチでは4~5月であり, いずれも産卵期にほぼ一致し, 輪紋数は年齢を示すと考えられた。満年齢時における両種の雌雄別逆算全長をもとに, 非線形最小二乗法を用いて, von Bertalanffyの成長式をあてた結果, t歳における全長Ltは次式で表された。マゴチ雄: Lt=458.26 (1-exp (-0.417 (t+0.439) ) )雌: Lt=728.44 (1-exp (-0.192 (t+0.978) ) )ヨシノゴチ雄: Lt=469.72 (1-exp (-0.215 (t+3.008) ) )雌: Lt=657.45 (1-exp (-0.267 (t+1.076) ) )両種とも, いずれの年齢においても雌の方が雄より大きい体サイズを示した。

著者

田北 徹 Sumonta Intong

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.57, no.10, pp.1883-1889, 1991 (Released:2008-02-29)

参考文献数

17

被引用文献数

18 16

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The early life histories of two puffers Takifugu rubripes and T. xanthopterus, were ecologically studied. The larvae of either or both species, not distinguishable from each other, were found in the middle or bottom layer in Ariake Sound and neighboring Chijiwa Bay in April and May. The juveniles of both species were noted in late May after becoming about 20mm in standard length at the mouths of rivers located at the head of Ariake Sound. T. rubripes stayed there until July or August, and T. xanthopterus for one month longer, under the condition of a large range of salinity. The diet of T. rubripes appeared to consist mainly of benthic animals such as crabs, zoeae, gammarids, fish lices, mysis and snails, whereas for T. xanthopterus, pelagic organisms. Many young puffers caught with commercial fishing nets are abandoned as trash fish and some efforts to conserve them should be made.