Water quality, fish production, economics and greenhouse gas emission under different dietary protein levels in pond reared with tilapia (Oreochromis mossambicus)

Md. Akhtar Hossain; Mst. Monira Khatun; Nurzahan Khanam; Tamanna Parvin; Md. Mosaddir Alam Saruar

doi:10.26832/24566632.2026.110304

Authors

Md. Akhtar Hossain
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh
Mst. Monira Khatun
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh
Nurzahan Khanam
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh
Tamanna Parvin
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh
Md. Mosaddir Alam Saruar
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

DOI:

https://doi.org/10.26832/24566632.2026.110304

Keywords:

Economic outcome, Environmental impact, Fish growth, Greenhouse gas emission

Abstract

The present experiment was carried out to study the water quality, production, economics and greenhouse gas emissions under different dietary protein levels in tilapia (Oreochromis mosssambicus) farming pond. The experiment was carried out using three treatments with varying dietary protein levels viz. T1: 27%; T2: 30% and T3: 33%, each with two replications. Tilapia stocking density (49400 individuals/ha) was similar across the treatments. Water quality was monitored fortnightly and calculated values of temperature, transparency, DO, CO2, pH, alkalinity, ammonia-nitrogen and TDS were recorded as 29.30±0.28 to 29.65±0.49oC, 29.37±1.22 to 34.70±2.54 cm, 4.98±0.17 to 6.17± 0.03 mg/L, 4.54±0.02 to 5.64±0.24 mg/L, 5.35±0.28 to 6.55±0.07, 86.25±3.81 to 97.77±2.51 mg/L, 0.10±0.01 to 0.35±0.07 mg/L and 522.82± 10.85 to 563.43±2.92 mg/L, respectively. The average measurement of weight gain, SGR, survival rate, FCR and yield of tilapia varied from 172.34 ±2.81 to 227.55 ±2.84 g, 1.25±0.01 to 1.34 ±0.11 % bwd-1, 78.00 ± 5.35 to 87.00 ±7.07 %, and 1.68±0.04 to 1.89±0.05 and 8062.08 ±70.72 to 9517.40±63.58 Kg/ha/6months, respectively. The mean values of net profit (BDT/ha), CBR and greenhouse gas emission (CO2e Kg/ha/year) were 320892.91±2474.68 to 484099.20±565.60, 0.49±0.00 to 0.71±0.00 and 7.20±0.12 to 8.52±0.04. Fish yield varied from 16124.16±49.41 (T1) to 19034.80±116.88 (T3) kg/ha/year. Greenhouse gas emission was found significantly (p<0.05) highest in the treatment T3, while net benefit and CBR were observed significantly (p<0.05) highest in the treatment T2. Thus, dietary protein level significantly influences water quality, fish growth, net profit and greenhouse gas emission in pond raised with tilapia (O. mossambicus).

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