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Updated: May 9, 2026
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Fish Sperm Assessment Using Software and Cooling Devices
Published on: July 28, 2018
Different computer-assisted sperm analysis (CASA) systems highly influence sperm motility parameters
S Boryshpolets1, R K Kowalski, G J Dietrich
1University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Vodňany, Czech Republic.
Theriogenology
|August 13, 2013
Summary
Different computer-assisted sperm analysis (CASA) systems impact sperm motility results. Frame rate and species significantly alter measurements, highlighting the need for careful CASA selection and standardized protocols in fish sperm analysis.
Area of Science:
- Aquatic biology
- Reproductive biology
- Spermatozoa analysis
Background:
- Computer-assisted sperm analysis (CASA) is crucial for objective sperm motility assessment.
- Variability in CASA systems and recording parameters can influence results.
- Understanding these variations is key for accurate fish sperm evaluation.
Purpose of the Study:
- To compare sperm motility parameters across three distinct CASA systems (CRISMAS, Hobson Sperm Tracker, Image J CASA).
- To evaluate the impact of different frame rates (25 Hz vs. 50 Hz) on motility measurements.
- To assess species-specific differences in sperm behavior and CASA system performance.
Main Methods:
- Analysis of identical video recordings from three fish species (sterlet, common carp, rainbow trout).
- Utilized 12-second recordings at 25 Hz and 50 Hz frame rates.
- Compared motility parameters including velocity and beat cross frequency (BCF) across CASA systems and species.
Main Results:
- Higher velocity and BCF values were consistently observed at 50 Hz compared to 25 Hz across all CASA systems.
- Significant differences in motility parameters were found between CASA systems and fish species.
- Sterlet sperm motility remained stable over 12 seconds, unlike common carp and rainbow trout, which showed decreased speed.
Conclusions:
- The choice of CASA system significantly affects sperm motility results, even with identical recordings.
- Frame rate and species-specific sperm behavior are critical factors influencing CASA measurements.
- Sterlet spermatozoa serve as a reliable model for extended motility studies due to their stability.
