コンテンツメニュー

Takeshita Naohiko


Inhibitory control of maturation for 0-year-old fourspine sculpin, Rheopresbe kazika in high-density rearing conditions

Journal of National Fisheries University Volume 69 Issue 1 Page 17-23
published_at 2020-11
69-1-17-23.pdf
[fulltext] 819 KB
Title
高密度で飼育したカマキリ当歳魚の成熟抑制
Inhibitory control of maturation for 0-year-old fourspine sculpin, Rheopresbe kazika in high-density rearing conditions
Creators Takeshita Naohiko
Creators Hatooka Fumitaka
Creators Uehara Takashi
Creators Ogi Tama
Creators Hamada Toshinori
Creators Ikeda Itaru
Source Identifiers [PISSN] 0370-9361
Creator Keywords
Inhibitory control of maturation Cottus kazika Rheopresbe kazika Heating condition Long-day condition
Inhibitory control of maturation in 0-year-old Rheopresbe kazika in high-density rearing conditions was examined using 3 replicate trials. In each trial, 4 groups of 52 fish at 90 days after hatching were reared in four 150 liter tanks. Juveniles at 180 days after hatching were reared in the following 4 different conditions:1) duration of lighting and water temperature were not treated (control), 2) duration of lighting was not treated but water temperature kept at 22℃ (heating treatment), 3) duration of lighting was extended but water temperature not treated (long-day treatment), 4) both extended duration of lighting and water temperature kept at 22℃ (long-day and heating treatment). These experiments were continued until 300 days after hatching. Gonad indices in the control condition were higher than the other rearing conditions, and those in the long-day and heating treatment condition were lower than the other rearing conditions. Therefore, it seems that the rearing method of maintaining the duration of lighting at long-day and water temperature kept at 22℃ is an available method for inhibitory controlling 0-year-old of R. kazika in an immature condition in high-density rearing.
Languages jpn
Resource Type departmental bulletin paper
Publishers National Fisheries University
Date Issued 2020-11
File Version Version of Record
Access Rights open access
Relations
[ISSN]0370-9361