Related Experiment Video
Updated: Aug 7, 2026
08:01
Induction of Hypoxia in Living Frog and Zebrafish Embryos
Published on: June 26, 2017
Reproductive endocrine dysfunction in Atlantic croaker exposed to hypoxia
Peter Thomas1, Md Saydur Rahman, James A Kummer
1The University of Texas at Austin, Marine Science Institute, Port Aransas, TX 78373, USA. thomas@utmsi.utexas.edu
Marine Environmental Research
|June 13, 2006
Summary
Low dissolved oxygen (hypoxia) significantly impairs ovarian growth and reduces viable gametes in female Atlantic croaker. These findings highlight hypoxia as a critical environmental stressor affecting fish reproduction.
Area of Science:
- Environmental toxicology
- Aquatic biology
- Endocrinology
Background:
- Environmental chemicals are known to impair fish endocrine function.
- Limited data exists on reproductive endocrine effects of environmental stressors like hypoxia.
Purpose of the Study:
- To investigate the reproductive morphometric and endocrine effects of low dissolved oxygen (DO) on female Atlantic croaker.
- To compare laboratory findings with fish from hypoxic field sites.
Main Methods:
- Controlled laboratory exposure of Atlantic croaker to low DO (2.7 ppm and 1.7 ppm) for ten weeks.
- Analysis of reproductive morphometrics and endocrine indicators.
- Comparison with fish from hypoxic Mobile Bay sites.
Main Results:
- Moderate hypoxia significantly impaired ovarian growth and oocyte production in Atlantic croaker.
- Hypoxia led to dramatic reductions in fecundity (viable gametes).
- Ovarian dysfunction correlated with decreased estrogen signaling pathway indicators and vitellogenin production.
Conclusions:
- Reproductive morphometric and endocrine biomarkers in Atlantic croaker are sensitive to moderate hypoxia.
- These biomarkers can serve as early warning indicators of reproductive failure due to hypoxia.
