How to adjust the wet fish feed pellet extruder machine to produce shrimp and crab feed?
January 22, 2026
Adjusting parameters for wet fish feed production equipment: Adapting to the growth needs of crustaceans
Shrimp and crab feed requires low puffing degree and high hardness to prevent excessive dispersion in water and facilitate feeding during molting. The extruder temperature is controlled at 110-130℃, 20-30℃ lower than ordinary fish feed, reducing porosity; pressure is maintained at 3-4MPa to ensure compact pellets; screw speed is increased to 350-400r/min to shorten raw material residence time and reduce puffing degree. The cutter speed is adapted to the die orifice diameter, controlling the pellet size to 0.5-2mm to accommodate different sizes of shrimp and crabs.
Formula optimization: Balancing nutrition and puffing adaptability
Shrimp and crabs have higher protein requirements than fish. The proportion of fishmeal and shrimpmeal in the formula is increased to 30%-40%, plant protein to 20%-25%, and starch to 25%-30%, avoiding excessive puffing due to high starch content. Adding 2%-3% chitosan enhances the molting ability of shrimp and crabs, while also adding appropriate amounts of calcium and phosphorus to meet their growth needs. The raw materials are ground to a fine particle size (100 mesh or finer) to ensure a smooth texture and prevent injury to the shrimp and crab intestines, while also adapting to the low-temperature operation requirements of wet fish feed making machines.
Post-processing adaptation: Improving feed water resistance
Shrimp and crab feed requires stronger water resistance; after extrusion, it needs to be coated. Wet fish food making machines can be equipped with a simple coating device to spray a waterproof coating agent after the pellets cool, extending the stability time in water to 4-6 hours. Simultaneously, the drying moisture content is controlled to 10%-11%. Through the synergy of extruder parameters and post-processing, the feed is ensured to be less prone to disintegration in the aquaculture environment, improving utilization.
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