A simple method for several-week sperm preservation applicable for various echinoid species

Area of Science:

• Marine Biology
• Developmental Biology
• Reproductive Biology

Background:

• Echinoids are crucial marine ecosystem components, fishery resources, and model organisms for fertilization and development studies.
• Effective gamete preservation methods for echinoids are needed for research, fisheries, and conservation.
• Cryopreservation is common but complex; simpler alternatives are desirable.

Purpose of the Study:

• To evaluate a simple chilled preservation method for echinoid sperm across various species.
• To assess the long-term fertilization capability and sperm characteristics after preservation.
• To determine the developmental outcome of embryos fertilized with preserved sperm.

Main Methods:

• Applied a previously established chilled preservation method to sperm from multiple echinoid species.
• Assessed fertilization rates and embryo development using preserved sperm over several weeks.
• Analyzed sperm motility, flagellar beat frequency, and flagellar beat form post-preservation.

Main Results:

• The chilled preservation method was effective for various echinoid species.
• Fertilization capability was maintained for several weeks, with higher sperm density needed later.
• Preserved sperm supported normal embryo development without morphological abnormalities.
• Sperm exhibited stable motility post-preservation, though flagellar beat frequency decreased.

Conclusions:

• The simple chilled preservation technique is broadly applicable to echinoid species.
• This method offers a cost-effective, universal approach for preserving echinoid sperm.
• The preserved sperm remain viable for effective use in research, fisheries, and education.