著者

林 徳之 中村 聡一 吉川 弘正 安部 恒之 小林 博

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.41, no.1, pp.7-13, 1994-05-20 (Released:2010-06-28)

参考文献数

27

被引用文献数

1

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We examined the role of olfaction involved in schooling of Japanese sea catfish Plotosus lineatus, and attempted to elucidate the relationship between the sensitivity to an aggregating pheromone and bodylength in reference to a reduction of the school size with growth in Japanese sea catfish. Behavioral test of preferenCe for sea water which had held their own school were carried out on 97 fish (42 to 235mm in total length), using filtrated sea water or sea water which had held another school as a control. The catfish discriminated and selected the sea water holding their own school. However, anosmic fish no longer discriminated their holding sea water, suggesting that this preference leading to a school was established by olfaction but not other sense organs including taste. No distinct change in the preference with fish growth was recognized. However, larger fish especially maturing females tended to show a lowered preference. This suggests that reduction in the constituent members of the school with growth in Japanese sea catfish was dependent upon breakaway from menace of predators or upon dispersal of maturing females from their school to avoid incest breeding.

著者

中村 聡一 小林 博

出版者

近畿大学

雑誌

近畿大学農学部紀要 (ISSN:04538889)

巻号頁・発行日

vol.23, pp.7-12, 1990-03-20

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1.グッピー,ティラピア,メダカ,コイ,コイナ,ワキン,コメットについて鰓蓋運動数の温度変化を測定し,その値から温度係数Q_<10>とArrheniusの式のμを常温から下の温度範囲で求めた. 2.Q_<10>は,いずれの魚種においても中等度の温度範囲では2〜3の値を示したが,低温まひによる鰓蓋運動の停止直前の温度では変動が大きく3〜8の高い値を示した. 3.Log f と1/Tの関係においてグッピー,ティラピア,メダカ,コイ,コイナでは,変曲点(臨界温度)が1つ求められ,その温度はグッピーとティラピアでは14.7〜15.9℃,他の魚種では9.2〜10.0℃であった. 4.μの値は臨界温度より高温では各魚種の間にほとんど差はなく1.0×10^4〜1.3×10^4であったが,臨界温度より低温ではμは高温側の値より大きく,魚種により変動が大きかった. 5.鰓蓋運動の停止温度の平均値はグッピー,ティラピアで9.6〜10.3℃,その他の魚種では3.7〜5.6℃の範囲内にあった.