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Does overwinter temperature affect maternal body composition and egg traits in yellow perch Perca flavescens?
Z S Feiner1, D P Coulter1, S C Guffey1
1Department of Forestry and Natural Resources, Purdue University, 195 Marsteller St, West Lafayette, IN, 47907, U.S.A.
Journal of Fish Biology
|March 5, 2016
Summary
Overwinter temperatures significantly influenced yellow perch spawning rates and egg fatty acid profiles, but not egg quantity or size. Colder conditions yielded potentially higher quality eggs and altered maternal condition.
Area of Science:
- Aquatic Ecology
- Fish Biology
- Reproductive Physiology
Background:
- Overwinter conditions are critical for fish reproductive success.
- Temperature influences fish physiology and egg development.
Purpose of the Study:
- To investigate the impact of overwinter temperature regimes on yellow perch (Perca flavescens) reproductive output.
- To assess how temperature affects female spawning proportion, fecundity, egg quality, and maternal condition.
Main Methods:
- Female yellow perch were exposed to three overwinter temperatures (4°C, 8°C, 13°C) for 150 days.
- Spawning success, egg size, lipid content, fatty acid composition, and maternal somatic condition were analyzed.
Main Results:
- Overwinter temperature significantly affected the proportion of females that spawned, with warmer temperatures leading to higher spawning rates.
- Egg size, fecundity, and lipid content did not differ, but egg fatty acid composition varied, with colder temperatures yielding eggs higher in unsaturated fatty acids.
- Maternal somatic growth and protein increased, while lipid content decreased at 13°C compared to colder treatments.
Conclusions:
- Winter temperatures influence yellow perch spawning behavior and egg composition, potentially impacting future reproductive success.
- While egg size and number show limited plasticity, overwinter temperature alters key reproductive and physiological traits in female yellow perch.
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