Processing and Application of Floating and Sinking Fish Feed
With the further development of fish farming industry, extruded fish feeds have obtained more and more wide applications in virtue of unique advantages including high nutrient, good palatability, strong digestibility and so on. As a new technology to produce feed, extrusion processing means that in the environment of high temperature(110-200°C), high pressure(25-100kg/cm2) and high water content(10%-20%, even 30%), fish feed stuffs mixture, through heating tempering, deep mixing and particles formation, would puff and afterwards shape into extruded feed when out of fish feed extruder machine.
On the basis of density variation and puffing degree, extruded fish feed can be segmented into floating fish feed and sinking fish feed. Currently, the floating feed is the most widely used extruded feed in fish farming, and it has relatively mature technology. That is, floating extruded feed pellets are both produced through modulator for heating and modulation, via continuous mixing process to fish feed raw materials after entering extruder machine, heating up, pressurizing, ripening, extruding and then puffing and granulating. Compared with floating fish feed, sinking pellets has different requirement on fish feed manufacturing technique because of the diverse request for specific gravity, even if when they use the same fish feed machine. Briefly, fish feed extrusion process requires a hammer mill to grind raw materials, mixer to blend raw materials including vitamin-mineral premix, the wet type fish feed extruder with steam preconditioner (yes, steam is equired for quality pellets) and cutter head to shape the pellets, and finally a dryer-cooler to ensure pellet shelf-life and stability.Compared with traditional powdery compound feed and pelleted feed, extruded fish feed can well overcome some conventional disadvantages, such as bad water stability, feed disappearing and waste, water quality pollution and so forth. In especial, floating extruded feed makes feeding management convenient because 
aqua feed can float on water for a long time and there is no need to set feeding station, just at fixed point to feed. Moreover, fish farmers can observe the food intake situation of their fish, adjust feeding quantity timely and master fish growth and health status in time. In a word, extruded fish feed can contribute to scientific feeding and management, saving much time and boost labor productivity.
aqua feed can float on water for a long time and there is no need to set feeding station, just at fixed point to feed. Moreover, fish farmers can observe the food intake situation of their fish, adjust feeding quantity timely and master fish growth and health status in time. In a word, extruded fish feed can contribute to scientific feeding and management, saving much time and boost labor productivity.
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