なわばりの密集した地域におけるアユの行動
BEHAVIOUR OF SALMON-LIKE FISH "AYU" IN AN AREA WITH CLOSELY ESTABLISHED TERRITORIES

Nobuhiko MIZUNO, Hiroya KAWANABE
1957 Nihon Seitai Gakkaishi  
Zoological lnStitu ・ tiz , CO1' ege げ Science, Kyeto Univefsity・ Kyoto ' ' Ayu " ( Plecogloss " s altivelis TEMMINCK et ScHLEGEL) has a behaviour to establish a terri . torア, not for breeding, but malnly for feeding. In 1956 , from the beginning to the end of June , anumber of territories of " Ayu " covered ・ the stone ・ bottom near Ukawa Bridge at the lower course of the River Ukawa in Kyoto Prefecture, as shown ill Figs .1 and 3、 The authors have observed in this area that the fish in
more » ... the fish in territories hardly gG out of their respective home range , that they do not extend their home ranges lmme . diately aftef the departure of their adjoiI き ing individual from his territory , and that territory ・ having individuals A and B , given i丑 Fig.2, seem to avoid contact between them , They htive also observed that territory ・ hhving fish dr三 ve Gut all 1 童 nvaders with the exception of those who are in the situations e 蓋 ther in driv三ng away their own invaders or in returning from such action . It may b。 i・ duced f・・ m th ・ ・e beha・ i ・urs th ・ t 、
doi:10.18960/seitai.7.1_26 fatcat:d4ek6ncjijhfxibyicg5upiw7m