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Improvement of Dried Fish Production System Suitable for Small Entrepreneurs and Marginal Producers

Dr. Ehsanul Karim
Senior Scientific Officer
MFTS, Bangladesh Fisheries Research Institute

Abstract/ Executive Summary:

This study presents a practical low cost, easy-to-fabricate and easy-to-operate dryer that can be suitably employed at small & medium scale factories as well as at large scale drying yards. Such low-cost fish drying technologies can be readily introduced in all fish processing areas to reduce spoilage, improve quality and overall processing hygiene. Considering the high demands the dried fish, the producers want a device by which they can produce dry fish at night and also in bad weather, an improved version of fish dryer named BFRI Mechanical Fish Dryer, sized 16.5' x 5.5' x 6.5’ was constructed by using SS Bar (Box type), black painted steel plated floor, transparent celluloid (1.2mm) polythene for better insulation and efficient utilization of heat energy. In this dryer, a motorized fan is used to force air circulation on the whole system between the entry and the exit of the drying chamber and also used an exhaust fan to reduce moisture contained excess air flow. Actually drying process largely depends on drying air temperature regardless of its moisture content. In all cases, the geometry of most drying chambers is not properly designed in order to ease the removal of humid air. Hence, BFRI Mechanical Fish Dryer was found the attractive compared to the traditional systems after assessing the drying performances i.e. organoleptic (sensory) characteristics, dehydrating rate and nutritional quality of the products.

Keywords: Dried Fish, Marine Fish, Fish Dryer

Location:

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Marine fish

Objectives:

To refine and extension of hygienic fish drying production technology for small to large scale producers.
To assess and standardize better quality shelf-life of dried fish in storage condition of large scale producers
To develop preventive measure to reduce infestation and weight loss in storage condition by using recommended/approved insecticides.

Methodology:

For this study, three interested entrepreneurs were selected from different places of Cox’s Bazar under collaboration with the scientists of MFTS, BFRI. Most common dried fishes like Bombay duck (Harpodon nehereus), Silver pomfret (Stromateus argenteus), Ribbon fish (Lepturacanthus savala) and miscellaneous small fish were trialed for this drying experiment. In addition, large sized fishes like Maittya, Surma were tried in such drying system. Dry fish processing unit was made of bamboo and total dry fish processing unit was covered with fine mesh nets to protect infestation. Inside the net covered area, bamboo racks was used to dry fish.

Source of Information: Annual Report 2017-19. 232 p.

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) : NaN

Achievement/Findings:

To produce hygienic dry fish in large scale, a model of improved traditional fish drying was developed by Marine Fisheries & Technology Station, BFRI, Cox’s Bazar. Dryer structure were box type with a length of 100 feet and 30 feet width (available drying space 15,000 sq. feet). The drying structure was built 4 feet above ground (+ 6 feet fish drying facilities). Fish dryer construction materials was bamboo pole, bamboo stick, nylon net (mesh size- 0.8 cm), fine mesh net, rope and ladder. Bamboo poles were fixed at 3 feet interval. Dryer roof and peripheral fence covered with nylon net (mesh size- 0.8 cm) and dryer bottom covered with fine meshed net. Bottom surface area was used for drying of pomfret and small fishes. Bamboo rows were used for Bombey duck and ribbon fishes. Fish drying capacity was estimated as 3,000 kg dried fish per lot. Fish drying period was 3 days for one lot and one day breaking for cleaning. Fish drying capacity per month was (3,000 kg × 6 lot) = 18,000 kg dried fish per month. Fish drying activities are operating in Cox’sBazar is about 8 months per year. Fish drying capacity per year of a large scale improved fish dryer = (18,000 kg × 8 month) = 144,000 kg = 168 metric ton hygienic dry fish.

Knowledge Management: Report/Proceedings