Changes in serum hormones of rainbow trout(Oncorhynchus mykiss) during progressive seawater adaptationα

• 영문명: Changes in serum hormones of rainbow trout(Oncorhynchus mykiss) during progressive seawater adaptationα
• 발행기관: 군산대학교 수산과학연구소
• 저자명: Jong-Man Yoon Kyung-Ho Lee
• 간행물 정보: 『군산대학교 수산과학연구소 연구논문집』제5집, 26~31쪽, 전체 6쪽
• 주제분류: 농수해양 > 수산학
• 파일형태: PDF
• 발행일자: 2004.07.03

영문 초록

A variety of hormones, including estradiol-17β, thyroxine(T₄), triiodothyronine (T₃) and prolactin have been found to modulate various aspects of osmoregulation, growth, development and metabolism of vertebrates. This study was taken to examine external, behavioral, and endocrine changes of female rainbow trout (Oncorhynchus mykiss) living in 0‰, 5‰, 10‰, and 15‰ salt concentrations, respectively. All fishes survived at 5 ‰, and 10‰, whereas some fishes died at 15‰ up to 8 weeks during the seawater challenge test. When fish were adapted from 0‰ to 10‰, feed intake of fish started from the fifth day. When fish were progressively adapted from 0‰ to 5‰, 10‰ and IS%', external body color of fish changed from rainbow to light-grey color. At the same time, thyroxine and triiodothyronine concentrations significantly (P<0.05) increased, and then were at the highest level in 15‰ salinity. The levels of triiodothyronine significantly changed in all salinities and its level was at the highest peak in 15‰, salinity. Changes in serum prolactin levels correlated with changes in triiodothyronine in 10‰ (+0.923). The levels of serum hormones such as estradiol-17β, triiodothyronine and prolactin were significantly higher in seawater-adapted group than those in freshwater group. These results showed the levels of progressively increased hormones in rainbow trout adapted in seawater. Especially triiodothyronine and prolactin seemed to be attributed to the seawater adaptation of rainbow trout. The serum estradiol-17β did not closely correlate with the sexual maturation of rainbow trout adapted in seawater.

목차

Abstract

Introduction

Material and Methods

Results

Discussion

Acknowledgements

References