Aquaculture has emerged as a significant contributor of Bangladesh’s economy, providing employment opportunities and the country’s food security. Bangladesh’s aquaculture industry growth relies on quality feed, improving fish health, increasing production, and profitability for farmers. The development of quality feed is crucial for the sustainable growth of the aquaculture industry in Bangladesh. Thus, the experiment was conducted to develop protein-rich poultry offal meals in the native catfish, Gulsha (Mystus cavasius) as fish diet. Four diets were formulated with a protein content of 35% containing various proportions of POM and fish meal. The fish meal in the basal diet of Mystus cavasius was replaced by 0%, 33.33%, 66.66%, and 100% POM inclusions, respectively. A total of 240 fish fingerlings (2.35 g to 2.70 g) were randomly distributed into four groups (Triplicate per group). After 60 days of feeding, the growth performance parameters of the fish were determined by required formulas and statistical tools. According to results, up to 66.66% replacement of FM with POM can be included in diets without compromising growth performance, feed utilization, and the health status of the fish. A higher substitution level of POM (100%) resulted in undesirable effects on growth performance compared with the control group. However, further research may be needed to continue into areas of utilization of POM as an alternative, least cost, and locally available protein source for replacement of FM and support sustainable aquaculture.
