Growth, External Morphology, and Resistance to Environmental Stress of Hybrid Sea Bream, Pagrus major*Sparus sarba.

• MURATA Osamu

  近畿大学水産研究所

• MIYASHITA Shigeru

  近畿大学水産研究所

• NASU Toshiro

  近畿大学水産研究所

• KUMAI Hidemi

  近畿大学水産研究所

Bibliographic Information

Other Title

• 交雑魚マダイ×ヘダイの成長，外部形態および環境ストレス耐性

Abstract

This study compared the growth, survival, external morphology, and resistance to environmental stress of the hybrid of red sea bream (_??_) and silver bream (_??_), red sea bream, and the gynogenetic diploid silver bream. The fertilization rate among buoyant eggs obtained by artificial insemination was the highest in red sea bream, followed by the hybrid. The rate in the gynogenetic diploid silver bream was remarkably lower than that in the other two (p<0.001) . The hatching rate in the hybrid and the gynogenetic diploid silver bream were similar but were lower than the rate in the red sea bream (p<0.05) . The survival rate 30 days after hatching was the highest in red sea bream, followed by the hybrid and the gynogenetic diploid silver bream. However, the survival rate 71-140 days after hatching was much higher in the hybrid and the gynogenetic diploid silver bream than in red sea bream (p<0.001) . Growth until about 10 months after hatching was faster in the hybrid, followed by red sea bream and the gynogenetic diploid silver bream. However, red sea bream gradually outperformed the hybrid from 1 year and 2 months. After 2 years and 6 months, the mean body weight of the hybrid was between that in red sea bream and that in the gynogenetic diploid silver bream (p<0.01) . The resistance of the hybrid to decreases in specific gravity of sea water was lower than that of the gynogenetic diploid silver bream but higher than that of red sea bream (p<0.01 and p<0.001, respectively) . However, the resistace to variation in water temperature or decreases in dissolved oxygen content were similar between the hybrid and red sea bream or the gynogenetic diploid silver bream. The hybrids were closer to the gynogenetic diploid silver bream in the external morphology and body color, suggesting more marked paternal inheritance.

Journal

• Aquaculture Science

  Aquaculture Science 43 (4), 475-481, 1995

  Japanese Society for Aquaculture Science

Keywords

• 交雑魚マダイ×クロダイ
• 成長
• 外部形態
• ストレス耐性

Details

• CRID: 1390282679692552192
• NII Article ID: 10004769957
• NII Book ID: AN00124667
• DOI: 10.11233/aquaculturesci1953.43.475
• ISSN: 21850194
• ISSN: 03714217
• Web Site: https://agriknowledge.affrc.go.jp/RN/2010570970
• Text Lang: ja
• Data Source:
  • JaLC
  • IRDB
  • CiNii Articles
• Abstract License Flag: Disallowed