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IMPACTS OF POLYETHYLENE TEREPHTHALATE MICROPLASTICS ON GROWTH PERFORMANCE AND BIOCHEMICAL BIOMARKERS IN ROHU, Labeo rohita
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Scientists exposed rohu fish—a popular food fish in South Asia—to microplastics commonly found in plastic bottles (PET) and discovered that higher doses caused stunted growth, blood abnormalities, liver stress, and increased oxidative damage in the fish's organs. Since these fish are widely eaten by humans, this research suggests that microplastic pollution in waterways could be compromising both the health of fish populations and the safety of seafood that ends up on our plates.
Plastic wastes are usually dumped into water that ultimately break down into microplastics (MP), which are harmful to fish populations. Thus, studies on microplastic pollution in water bodies are essential to comprehend its effects and develop practical approaches to protect aquatic life and ecosystems. The current study investigated the effects of water-borne microplastics polyethylene terephthalate (PET-MPs) on growth, hematological indices, serum biomarkers (ALP, AST, ALT, and cortisol), and oxidative status of targeted organs (liver, gills, and intestine) of commercially important fish, Labeo rohita (L. rohita). Healthy individuals of L. rohita (weight, 30 ± 2g; length, 10 ± 1 cm) were exposed to different concentrations (T1-0, T2-10, T3-20, and T4-40 mgL-1) of PET-MPs with an average size of 546.91μm, respectively, for a period of 28 days. The results indicated the dose-dependent toxic effects of PET-MPs on growth and biochemical parameters of L. rohita. Growth performance was considerably (p≤0.05) decreased in PET-MPs exposure groups. Hematological results indicate that red blood cells, hemoglobin and hematocrit (HCT) values were significantly decreased as the concentration of PET-MPs increased. In the case of serum biomarkers, the levels of aspartate aminotransferase (AST), alanine transaminase (ALT), alkaline phosphatase (ALP), and cortisol were significantly increased. Likewise, antioxidant enzymes superoxide dismutase (SOD), catalase (CAT) activities and melano dialdehyde (MDA) level were also significantly increased in an organ- and dose-dependent manner. PET microplastics caused apparent dose-related physiological stress and organ toxicity in L. rohita, which showed their adverse effects on fish health and their potential threat to aquatic ecosystems and food safety. This study could help regulatory bodies to take appropriate steps to maintain healthy conditions of water bodies.
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Toxicological Effects of Polystyrene Microplastics on Growth, Enzymatic Activity, Hematology, and Tissue Integrity in Labeo rohita
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Scientists exposed farmed fish (Rohu, a popular food fish) to microplastic pollution levels found in some contaminated waters and found it damaged their gills and intestines, slowed their growth, caused anemia-like symptoms, and made it harder for them to absorb nutrients from food. While this study was done in fish rather than humans, it matters because it shows microplastics can cause real physical harm to the animals we eat and to aquatic ecosystems overall—raising concerns about both food supply sustainability and the broader impact of plastic pollution making its way up the food chain.
Polystyrene microplastics exposure in freshwater fish, Labeo rohita: evaluation of physiology and histopathology
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Researchers fed freshwater fish varying levels of polystyrene microplastics for 90 days and found dose-dependent damage to blood health, growth, and organ tissues. Higher microplastic concentrations caused more severe harm to the liver, kidneys, gills, and intestines. The study highlights that microplastics in freshwater systems can accumulate in fish and cause significant health problems, raising concerns about food safety for communities that rely on freshwater fish.
Effect of plastic microbeads on the development of roho (Labeo rohita)
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Researchers fed roho fish (Labeo rohita) varying doses of plastic microbeads over 120 days and found that ingesting microplastics directly stunted their growth, with higher concentrations causing greater harm — providing evidence that microplastic pollution can impair the health of freshwater fish species.
Assessment of dietary polyvinylchloride, polypropylene and polyethylene terephthalate exposure in Nile tilapia, Oreochromis niloticus: Bioaccumulation, and effects on behaviour, growth, hematology and histology
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Nile tilapia fish fed three common types of microplastics (PVC, polypropylene, and PET) showed reduced growth, abnormal behavior, blood cell damage, and tissue damage in their gills, liver, and intestines. The harmful effects increased with higher doses of microplastics and varied by plastic type. Since tilapia is one of the most widely consumed fish globally, these findings raise concerns about the health of fish that may carry microplastic contamination to human diets.
Microplastic Bioaccumulation and its Systemic Effects in Labeo rohita: From Cellular Damage to Behavioural Disruption
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Rohu carp (Labeo rohita) exposed to polyethylene microplastics at up to 5 mg/L for 60 days accumulated particles in gills, liver, and intestines with dose-dependent cellular damage, behavioral disruption, and partial recovery after 30 days in clean water.
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