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Updated: Dec 26, 2025

Incremental Temperature Changes for Maximal Breeding and Spawning in Astyanax mexicanus

Incremental Temperature Changes for Maximal Breeding and Spawning in Astyanax mexicanus

Published on: February 14, 2021

Effects of preventing a temperature decrease during winter on reproduction of male small-egged Kajika, Cottus pollux

Yasunori Koya¹, Ryoji Fujii², Daisuke Tahara³

¹Department of Biology, Faculty of Education, Gifu University, Yanagido, Gifu, 501-1193, Japan. koya@gifu-u.ac.jp.

Fish Physiology and Biochemistry

|March 14, 2020

Summary

Preventing temperature decrease in winter suppresses reproductive activity in male Cottus pollux SE. Higher water temperatures impacted testicular development and nesting behaviors, despite not fully inhibiting spermatogenesis.

Keywords:

Androgen Behavior Global warming Nesting Sculpin Spermatogenesis

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Area of Science:

Ichthyology
Reproductive Biology
Environmental Physiology

Background:

Male cold-water teleosts, like Cottus pollux SE, exhibit seasonal reproductive cycles influenced by temperature.
Understanding the impact of altered temperature regimes on fish reproduction is crucial for conservation and aquaculture.

Purpose of the Study:

To investigate how preventing natural temperature decreases in winter affects the reproductive activity of male Cottus pollux SE.
To assess the influence of different temperature regimes on testicular development, serum 11-ketotestosterone (11-KT) levels, and nesting behaviors.

Main Methods:

Male Cottus pollux SE were exposed to three cooling regimes: control (16 to 6°C), H1 (16 to 11°C), and H2 (16 to 14°C) from November to January.
Measurements included testicular development, serum 11-KT levels, urine accumulation, and frequencies of nesting-associated behaviors (body undulation, face displays).

Main Results:

Higher water temperature regimes led to increased testicular development and serum 11-KT levels from November to mid-December.
While spermatogenesis was not completely suppressed, physiological nesting responses (elevated 11-KT, suppressed urine accumulation) were negatively affected.
Nesting behaviors, including body undulation and face displays, were suppressed at higher temperatures (~14°C) compared to normal winter temperatures (~7°C).

Conclusions:

Preventing a decrease in water temperature during winter significantly suppresses reproductive activity in male Cottus pollux SE.
Altered temperature regimes disrupt key physiological and behavioral aspects of reproduction, impacting nesting success.