High-Performance Fish Feed Machine for Aquafeed Pellet Production

The main difference lies in the forming method.

Fish feed pellet mill relies on mechanical pressure to compress powder into hard pellets. The process operates at a relatively low temperature, features a simple structure, and has lower operating costs. It is typically used to produce sinking feed.

Fish feed extruder uses high temperature, high pressure, and screw extrusion to fully cook the raw materials before forming. The resulting pellets have a uniform internal pore structure. This allows the extruder to produce floating feed, and by adjusting the process, it can also produce slow-sinking or sinking products.

In terms of product adaptability, pellet mills are better suited for standardized, large-batch production of conventional fish feed. Extruders, however, meet the needs for more fish species, more complex formulas, and higher-quality feed.

For traditional species like Grass Carp and Common Carp, sinking feed still holds a large market share. Therefore, some projects still use pellet mills to reduce equipment investment and production costs.

However, with the development of intensive farming, aquaculture companies are increasingly focusing on feed utilization, management efficiency, and water quality control. The demand for floating and slow-sinking feed is rising, making the extrusion process a key choice for new fish feed projects.

If you want to cover more fish species and adapt to different farming modes, the extruder usually offers greater flexibility for product development.

The key lies in the special high-temperature and high-pressure processing.

Inside the extruder, raw materials undergo high temperature, high pressure, and strong shearing, causing the starch to fully gelatinize. When the material exits the die, the pressure drops instantly, causing internal moisture to vaporize and expand. This creates numerous uniform micro-pores inside the pellet.

These micro-pores lower the overall density of the pellet, allowing the feed to float on the water.

By adjusting the formula, temperature, pressure, and process parameters, extruders can also produce slow-sinking and sinking products, offering great flexibility in modern aquatic feed production.

There is some overlap in production, but they generally cannot completely replace each other.

For ordinary sinking fish feed, both machines can complete the task. However, for floating feed, highly cooked feed, or special functional products, the pelleting process often cannot achieve the same results as extrusion.

Conversely, while extruders can produce sinking products, their equipment investment and operating costs are typically higher than traditional pellet mills.

Therefore, they are not simple substitutes but rather different production solutions suitable for different product positioning and market demands.

Before choosing, ask yourself three questions:

• What products do you plan to produce?
Is it ordinary sinking fish feed, floating fish feed, or shrimp and special aquatic feed? Different products require different processing technologies, which determines the direction of your production line.

• Will you expand your product line in the future?
Many projects start with one type of feed but add new categories as the market changes. If your equipment lacks expandability, you may face the need for re-investment later.

• How long do you plan to operate the project?
If the goal is just to meet current needs, configure the equipment for the present. If you aim for long-term operation with room for upgrades, consider future product upgrades and market changes from the very beginning.

Generally, the most suitable equipment is not the cheapest, but the one that meets current production needs while supporting future development.

The difference mainly lies in the forming process.

If you produce sinking fish feed, you usually use the pelleting process. The pellets have high density and sink naturally in water.

If you need to produce floating fish feed, you typically use the extrusion process. Through high temperature and pressure, an internal micro-pore structure is formed, allowing the pellets to float on the water surface.

For farmers, floating feed makes it easier to observe feeding and reduces waste, while sinking feed is more suitable for bottom-feeding fish.

Therefore, when planning a production line, determining whether your product is floating or sinking feed is more important than the specific equipment model.

Most fish feed machines can handle common aquatic feed formula ingredients.

Examples include corn, soybean meal, fish meal, wheat, rice bran, and wheat bran. Some projects also add meat and bone meal, shrimp meal, rapeseed meal, or other protein sources based on formula requirements.

More important than whether it can be processed is whether the raw material ratio, moisture content, and grinding fineness meet the process requirements. The same machine will produce different pellet quality with different raw material formulas.

If you have determined your main raw material sources, providing formula information during equipment selection will help you get a more suitable production solution.

Many customers think pellet quality depends only on the machine, but the machine is just one part of the equation.

To obtain stable fish feed pellets, you must first ensure consistent raw material ratios. Second, you need to control key processes like grinding, mixing, and pelleting or extrusion. Finally, the equipment must maintain long-term stable operation.

For highly automated production lines, most process parameters can be automatically controlled, reducing fluctuations caused by human operation.

Simply put, stable formula, stable process, and stable equipment are all indispensable. Only when the entire system works in synergy can you consistently produce fish feed of uniform quality.