Polystyrene microplastics effects on zebrafish embryological development: Comparison of two different sizes

Area of Science:

• Environmental Science
• Toxicology
• Marine Biology

Background:

• Microplastic pollution is a growing global concern.
• Understanding the health impacts of microplastics on aquatic organisms is crucial.

Purpose of the Study:

• To investigate the toxicity of two sizes of polystyrene microplastics (PS-MPs) in zebrafish embryos.
• To assess the effects of varying PS-MP concentrations on zebrafish development and physiology.

Main Methods:

• Zebrafish embryos were exposed to 1 µm and 3 µm PS-MPs at concentrations ranging from 0.01 to 10.0 mgL⁻¹.
• Embryos were monitored for survival, hatching, heart rate, and phenotypic changes up to 72 hours.
• Larvae were analyzed for PS-MP accumulation, apoptosis, and redox homeostasis.

Main Results:

• No significant impact on zebrafish embryo survival or hatching was observed.
• Higher concentrations of PS-MPs led to increased heart rate and phenotypic alterations.
• PS-MP accumulation in larvae at 10.0 mgL⁻¹ correlated with increased apoptosis and altered redox homeostasis.

Conclusions:

• Polystyrene microplastics exhibit size-dependent toxicity in zebrafish embryos.
• Exposure to PS-MPs can induce physiological stress and developmental abnormalities.
• Further research is needed to fully elucidate the long-term effects of microplastic exposure.