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Shoal size as a key variable in fish behavioral ecotoxicology: an example using sertraline
Asma Al Shuraiqi1, Michael J Barry2
1Biology Department, Sultan Qaboos University, Muscat, Oman.
Ecotoxicology (London, England)
|November 4, 2024
Summary
Shoal size significantly impacts fish behavior more than sertraline exposure. Understanding social context is crucial for accurate ecotoxicology risk assessment.
Area of Science:
- Behavioral ecotoxicology
- Aquatic toxicology
- Fish behavior
Background:
- Reproducible results in behavioral ecotoxicology are challenging due to variable testing conditions.
- Shoal size influences fish behavior but is often overlooked in ecotoxicological studies.
Purpose of the Study:
- To investigate the effects of sertraline on swimming and antipredator behavior in Arabian killifish.
- To determine the influence of shoal size on these behavioral responses.
Main Methods:
- Arabian killifish (Aphaniops stoliczkanus) were exposed to 5 or 50 ng/L sertraline for 37 days.
- Fish were tested in groups of 1, 3, or 5 individuals.
- Swimming behavior and predator alarm responses were measured.
Main Results:
- Shoal size had a greater effect on swimming behavior than sertraline.
- Shoal size was the primary factor in antipredator responses, with solitary fish showing the strongest reactions.
- Sertraline affected acceleration, turning speed, and distance to the arena wall, with interactions observed with shoal size.
- Sertraline's effects persisted for 14 days after exposure cessation.
Conclusions:
- Shoal size is a critical factor that must be considered in behavioral ecotoxicology studies.
- Ignoring social context, like shoal size, can lead to inaccurate risk assessments for chemicals.
