We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Biological Stress Responses of Organisms to Microplastic Pollution in the Bulgarian Part of the Black Sea
Summary
Scientists found tiny plastic particles (mostly under 50 micrometers—smaller than a grain of sand) inside fish and shellfish from the Bulgarian Black Sea coast, and these particles were linked to higher levels of cellular stress in the animals. Since we eat many of these same seafood species, this research is a reminder that the microplastics building up in ocean life could eventually make their way onto our plates, even though this study didn't directly test effects on humans.
Plastic pollution has emerged as one of the most pervasive environmental challenges, with microplastics (MPs) widely distributed across marine ecosystems worldwide. This study aimed to assess the uptake of MPs by key fish and invertebrate species from different locations in the coastal zone of the Bulgarian Black Sea. Fish were collected during routine monitoring surveys in September–November 2024, while invertebrates were obtained via scuba diving. The presence of MPs in fish stomachs and invertebrate soft tissues, and their polymer composition, shape and size were analyzed using an Agilent 8700 LDIR Chemical Imaging System. Potential biological effects of ingested MPs were evaluated by an integrated Specific Oxidative Stress (SOS) index. The results revealed MP uptake levels comparable to those reported globally. Small-sized particles (<50 µm) with rounded shapes were most abundant across studied taxa. Polymer composition varied considerably depending on species and sampling region, indicating differences in exposure sources and environmental conditions. Oxidative stress levels in both fish and invertebrates showed substantial interspecific variation, and clear differences between the northern and southern region of the Bulgarian Black Sea. Overall, elevated uptake of MPs appears to contribute to oxidative stress in marine organisms, potentially affecting their health status, resilience, and adaptive capacity, as reflected by increased SOS index values.