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Related Experiment Video

Updated: Jan 8, 2026

Author Spotlight: Advancing Coral Research by Exploring Climate Change Resistance, Ex Situ Aquaculture, and Reproduction Strategies

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Published on: June 23, 2023

Potential bleaching effects on coral reproduction.

Mary Hagedorn^1,2,3, Virginia L Carter^1,2, Claire Lager²

¹Department of Reproductive Sciences, Smithsonian Conservation Biology Institute - National Zoological Park, Front Royal, VA 22630, USA.

Reproduction, Fertility, and Development

|December 12, 2025

Summary

Coral bleaching severely impairs reproduction, reducing sperm motility and cryopreservation viability. Urgent ex situ coral banking during non-bleaching periods is crucial for conservation.

Keywords:

Fungia scutaria Montipora capitata Symbiodinium cryopreservation sperm

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Physiological Characterization of the Coral Holobiont Using a New Micro-Respirometry Tool

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Published on: April 28, 2023

Area of Science:

Marine Biology
Reproductive Biology
Conservation Science

Background:

Coral bleaching events significantly impact coral reproductive success for extended periods.
Limited data exists on post-bleaching reproductive characteristics, particularly concerning cryopreservation.

Purpose of the Study:

To assess the reproductive parameters of Fungia scutaria and Montipora capitata following the 2014-2015 bleaching event in Hawaii.
To evaluate the viability of fresh and cryopreserved sperm and its impact on fertilization and larval development.

Main Methods:

Measured spawning periods, egg morphometry, sperm concentration, and motility (fresh and cryopreserved with DMSO).
Assessed time to first cleavage, larval survival, infection, and settlement success using both fresh and cryopreserved gametes.
Analyzed reproductive data from coral species Fungia scutaria and Montipora capitata.

Main Results:

Reproductive parameters, notably sperm motility, were significantly reduced in 2015 post-bleaching.
Cryopreservation of 2015 post-bleach sperm led to a sharp decline in post-thaw viability.
Reduced sperm quality and cryopreservation success hinder conservation efforts.

Conclusions:

Coral bleaching compromises sperm quality and cryopreservation efficacy, threatening future reproductive success.
The increasing frequency of bleaching events jeopardizes ex situ coral banking strategies.
Immediate, intensive coral banking during non-bleaching periods is essential to preserve genetic diversity.