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.
extruding process
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 fish-farmaqua 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. So as the ideal fodder of modern aquaculture, extruded aqua feed has quite good market prospect and wide application fields.
fish-feed-extruding-process

In addition to those benthonic animals, most aquaculture species can ingest floating extruded fish feed very well, not only for the famous-special fish species (like aquarium fish), but also for conventional cultivation (like grass crap, crucian, catfish, tilapia and so on). What’s more, in the aspect of breeding method, floating fish feed has more extensive applicability, that is to say, for pond fish farming, culturing fish in rice field, running water fish culture, cage culture, and especially for fish farm with lower breeding density, extruded floating feed has much more superiority than other fish feed.

 Extension Reading:
Aquatic Pelleted Feed Vs Extruded Feed - Which Is Best for Fish

Factors Affecting Extruded Fish Feed Quality and Yield

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