Effects Of Microplastics On Fish Physiology

Micro plastics are defined as a heterogeneous mixture of materials that can take on a range of morphologies, including fibers, granules, pellets, splinters, or beads, and have dimensions ranging from 0.1 μm to 5000 μm. Because they are so common in the environment, micro plastics (MPs) pose a serious threat to aquatic ecosystems and species. The purpose of this review is to examine the effects of micro plastic exposure on fish physiology, with a focus on accumulation, organ function and potential implications for reproductive health. When exposed to MPs, either by themselves or in conjunction with other contaminants, fish may experience a variety of health issues. Micro plastics build up in the gastrointestinal tract (GI) of fish after ingestion, obstructing their stomach and intestines and decreasing their capacity to feed. Micro plastics cause growth and nutritional problems in fish by sticking to their skin, moving to organs including the liver, muscles, and gills, and getting into the lymphatic or circulatory systems. MPs can induce oxidative stress, harm fish tissue, and affect the fish's antioxidant levels. Micro plastics can also result in apoptosis, inflammatory reactions, and organ damage. All vertebrates, including fish, have reproductive systems that are regulated by hormones. These systems include the hypothalamus-pituitary-renal (HPR) and hypothalamus-pituitary-gonadal (HPG) axes. MPs can adsorb organic contaminants from the environment or contain additives. These substances have the potential to disturb fish endocrine systems, which could impact hormone levels and reproductive processes. MPs' harmful effects can be passed down to the next generation via germ cells, resulting in intergenerational, multigenerational, or transgenerational reproductive impacts on progeny. Our findings demonstrate the critical need for multidisciplinary studies to fully understand MP toxicity and the effects it has on aquatic environments. In conclusion, we pinpoint areas of unmet knowledge that require more study, such as examining the potential consequences of MP exposure on future generations and measuring the positive and negative interactions between MPs and other ecological contaminants. This increased understanding of the possible consequences of MPs on aquatic wildlife is expected to help policymakers design mitigation policies to preserve aquatic species. More long-term studies are needed to assess chronic effects on fish populations and ecosystems.