Toxicity of Dietary Non-biodegadable Microplastics on Growth Performance, Carcass Composition, Nutrient Digestibility and Hematology of Labeo rohita | [Pakistan Journal of Zoology • 2025]

Author(s):

1. Eram Rashid: Fish Nutrition Lab, Department of Zoology, Government College University,Faisalabad,Pakistan

2. Syed Makhdoom Hussain: Fish Nutrition Lab, Department of Zoology, Government College University,Faisalabad,Pakistan

3. Salma Sultana: Fish Nutrition Lab, Department of Zoology, Government College University,Faisalabad,Pakistan

4. Muhammad Asrar: Fish Nutrition Lab, Department of Zoology, Government College University,Faisalabad,Pakistan

5. Majid Hussain: Department of Fisheries and Aquaculture, University of Okara,Okara,Pakistan

Abstract:

Microplastics (MPs) pollution is one of the major environmental problems facing the world today. Concerns over the harmful effects of MPs on aquatic life has grown. The current study was carried out to assess the toxic effects of non-biodegradable MPs on growth, carcass composition, nutrient digestibility and hematology of Labeo rohita fingerlings. Six sunflower meal (SFM) based test diets having different MPs levels such as test diet I (control, without MPs), test diet II (0.5% MPs), test diet III (1% MPs), test diet IV (1.5% MPs), test diet V (2% MPs) and test diet VI (2.5% MPs) were prepared and fed to triplicate groups of 15 fingerlings at 5% of their live wet body weight for 90 days. The results showed that dietary exposure of MPs significantly reduced growth rate and feed utilization in L. rohita fingerlings. Lowest weight gain (5.29g) was recorded in fingerlings fed test diet VI (2.5% MPs) with highest feed conversion ratio (3.86) when compared to control diet (without MPs). Apparent digestibility of all dietary nutrients of SFM based diet also decreased directly with increase in MPs level in SFM based diet. By being exposed to non-biodegradable MPs, carcass composition altered significantly, with an increase in body fat and moisture content and a decrease in body protein and ash content. The hematological parameters (RBCs, Hb, PLT and PCV) showed a significant decline after exposure to MPs, while WBCs, MCHC, MCH and MCV increase significantly by MPs ingestion. Conclusively, non-biodegradable MPs are toxic agents showing adverse impacts on health of fish.

Page(s): 895-903

DOI: 10.17582/journal.pjz/20230511160518

Published: Journal: Pakistan Journal of Zoology, Volume: 57, Issue: 2, Year: 2025

Keywords:

Growth performance , L , rohita , Nonbiodegradable microplastics , Nutrients utilization , Carcass position

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