Development of ready-to-cook battered and breaded fish products from freshwater species

Introduction

For centuries, freshwater fish in South Asia was consumed either fresh from the pond or sundried for lean-season storage -two extremes with little middle ground [1] . The rise of urban supermarkets and quick-service restaurants over the past two decades has created a large, unmet demand for convenience fish products that can be stored frozen and fried at home in under five minutes [2] . Ready-to-cook battered and breaded items already dominate the marine-fish value-addition segment in export-oriented units along Bangladesh's coastal belt, but their freshwater counterparts remain almost non-existent in domestic retail [3] . The bottleneck is not supply. Bangladesh's inland aquaculture output crossed 4.6 million tonnes in 2022, with rohu, catla, and mrigal -the three South Asian major carpsaccounting for more than 80% of production [4] . Tilapia farming has expanded rapidly in Mymensingh and Jessore divisions, adding another high-volume species to the raw-material pool [5] . What is missing is standardised processing technology adapted to the softer texture, lower fat content, and milder flavour of freshwater species compared with marine fish such as surimi-grade Alaska pollock [6] . Battering and breading serve two purposes: the coating acts as a moisture barrier during frying, retaining juiciness, and it provides the crisp surface texture that consumers associate with convenience fish products [7] . Chickpea flour (besan) is widely available, inexpensive, and contributes a higher protein content than wheat-based batters [8] . This research aimed to develop a standardised RTC process for three commercially important freshwater species and to track product quality over five weeks of frozen storage.

Product Preparation Protocol

Fresh fish were procured from the Mymensingh wholesale fish market within 6 h of harvest, transported on ice (1:1 fish-to-ice ratio), and processed the same day. Fish were gutted, filleted, skinned, and cut into rectangular portions of approximately 50±3 g. Batter was prepared by mixing chickpea flour (100 g), rice flour (20 g), salt (3 g), turmeric powder (1 g), and chilled water (120 mL) to achieve a batter viscosity of 1,800 cP measured with a International Journal of Agriculture and Food Science https://www.agriculturaljournals.com Brookfield viscometer at 25 °C [9] . Each fillet portion was dipped in batter for 10 s, rolled in commercial bread crumbs (average particle size 2.5 mm), pre-fried in refined sunflower oil at 180 °C for 30 s, drained on absorbent paper, blast-frozen at -35 °C for 90 min, and sealed in polyethylene pouches (thickness 80 µm) under partial vacuum.

Quality Control

Proximate analyses were performed in triplicate following AOAC standard methods. TBA values were determined by the distillation method of Tarladgis et al. [10] . TVB-N was estimated by the Conway micro-diffusion technique. Aerobic plate count (APC) was enumerated on plate count agar incubated at 37 °C for 48 h. Sensory evaluation used a 9-point hedonic scale with a trained panel of 12 members.

Frying oil was replaced after every 5 kg of product to prevent carry-over off-flavours.

Material and Methods Material

The research was conducted in the Fish Processing [11] .

Results

Initial moisture content ranged from 73.8% (tilapia) to 75.1% (catla), while crude protein fell between 16.4% and 17.8% on a wet-weight basis. Fat content was lowest in tilapia (2.1%) and highest in catla (3.7%). All products showed progressive increases in TBA and TVB-N values during storage, with tilapia deteriorating fastest. thinner fillet sections allowed faster moisture migration through the batter coat, accelerating lipid oxidation. The chickpea-flour batter contributed meaningfully to product protein (accounting for roughly 2.3% of total protein) and provided a crisp texture that panellists rated higher than wheat-based reference samples from an earlier pilot trial.

Discussion

The shelf life of 28 days for rohu and catla RTC products aligns with the 25-30 day range reported for battered marine fish products stored at -18 °C in export-oriented units along Bangladesh's Chittagong coast [12] . Tilapia's shorter shelf life mirrors observations by Tokur et al., who attributed faster oxidation in tilapia fillets to their higher ratio of polyunsaturated to saturated fatty acids, which increases susceptibility to free-radical attack [13] . Agreement also exists with Ninan et al., who found that chickpea-flour batter outperformed rice-flour-only batter in moisture retention during frying -a finding consistent with the low frying losses (< 8%) recorded here [14] . One point of departure is the APC trajectory: our day-28 counts (4.4-5.1 log CFU g⁻¹) exceeded those reported by Reddy et al. for vacuum-packed marine fish fingers (3.8 log CFU g⁻¹ at 30 days), possibly because partial rather than full vacuum was used in the present packaging [15] . From a market standpoint, a 28-day frozen shelf life is adequate for domestic retail distribution, where products typically reach the consumer within 10-15 days of dispatch. The chickpea-flour batter positions the product as a healthier, protein-enriched alternative to imported wheatbattered marine fish sticks, a narrative that domestic marketers can exploit [16] .

Conclusion

This research set out to develop a standardised RTC battered and breaded product from three freshwater fish species. The chickpea-flour-based batter and bread-crumb coating delivered products with acceptable proximate composition, sensory quality, and microbiological safety for at least 28 days of frozen storage (rohu and catla) and 21 days (tilapia). Catla emerged as the best raw material for this product category owing to its firm flesh, moderate fat content, and superior sensory acceptance. For processors, the protocol requires only basic equipment -a fryer, blast freezer, and vacuum sealer -making it scalable to small and medium enterprises. Future directions include testing modified-atmosphere packaging to extend tilapia shelf life, incorporating natural antioxidants (e.g., rosemary extract) into the batter, and conducting consumer acceptability trials across multiple Bangladeshi cities.

Acknowledgement

AcknowledgementsInstitutional Support: The Fish Processing Laboratory of Bangladesh Agricultural University provided access to blast-freezing, frying, and analytical equipment throughout the research. Contributions:The authors thank the sensory panel members for their consistent participation across all sampling intervals.Funding Sources: This work was supported by the departmental research budget of the Department of Agricultural Processing.

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