飼育下におけるノトイスズミの日間採餌量の見積と採餌日周性の検討

Estimation of daily feeding rate and diel feeding rhythm of　herbivorous fish Kyphosus bigibbus in captivity

Creators Noda Mikio

Creators Kawano Masahiro

Creators Okamoto Kuniaki

Creators Murase Noboru

Daily feeding rate in relation to temperature and diel feeding rhythm of the grey sea chub Kyphosus bigibbus were examined for Eisenia bicyclis and Sargassum patens forming seaweed beds under tank-rearing condition. Daily feeding rate of K. bigibbus ranged from 0.7 to 1.3% for E. bicyclis and from 3.4 to 4.6% for S. patens (in the temperature range from 20 to 30 ℃) and the fish showed almost no feeding at 12 ℃. K. bigibbus constantly fed on algae at night as well as in the daytime and in particular showed the most intensive feeding activity before sunset and after sunrise.

[ISSN]0370-9361