How to evaluate the quality of the finished product from a floating fish extruder machine?

Dec 11, 2025

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Static water resistance assessment is the most basic testing method, simulating the stable state of particles in still water. Specific procedures: Select 50 uniformly sized particles from the outlet of the small fish feed pellet making machine and weigh them (recorded as M1); place the particles in a beaker containing room temperature water (25℃), observe and record the time; remove the particles at 5 minutes, 10 minutes, 20 minutes, and 30 minutes, blot off the surface moisture with filter paper, and weigh them again (recorded as M2), while simultaneously observing whether the particles disintegrate. The water resistance qualification standard is: no significant particle disintegration within 30 minutes, and a weight loss rate ((M1-M2)/M1×100%) ≤ 8%. Different aquatic animals have different water resistance requirements: shrimp and crab feed needs to withstand water for more than 60 minutes, bass and grass carp feed needs to withstand water for 30-40 minutes, and bottom-dwelling fish feed such as loach needs to withstand water for 20-30 minutes. A shrimp feed factory tested the water resistance using this method and found that the pellets disintegrated within 20 minutes. After adjusting the pellet mill temperature parameters (increasing from 80℃ to 100℃), the water resistance time was extended to 70 minutes.

Dynamic water resistance assessment more closely reflects actual aquaculture scenarios, simulating the state of pellets under the impact of flowing water or fish feeding. Using a dedicated dynamic water resistance testing device, the pellets are fixed in a net basket and placed in a circulating water system (water flow velocity 0.2m/s, simulating pond water flow). The pellet condition is observed and weighed every 10 minutes. The passing standard is: pellet structure intact within 40 minutes, no obvious breakage, and weight loss rate ≤10%. Dynamic water resistance is more stringent than static water resistance; many pellets that meet the static standard will have problems in dynamic testing. A fish feed factory in Zhejiang Province once had a case where the static water resistance was qualified but the dynamic test was unqualified. Investigation revealed uneven internal density of the pellets. By adjusting the screw speed of the small fish feed maker machine (reducing from 200r/min to 150r/min), the pellet compaction was improved, and the dynamic water resistance met the standard.

Water resistance assessment also needs to be combined with dissolved matter testing to avoid the problem of "intact appearance but nutrient loss". In the static water resistance test, samples are taken to test the content of nutrients such as protein and vitamins. If the protein content in the water exceeds 0.5g/L, it indicates that although the pellets have not collapsed, a large amount of nutrients have dissolved, and the product is still considered substandard. This indicator is often overlooked. A grass carp feed factory once had pellets that appeared to be water-resistant, but the vitamin C content in the water exceeded the standard, leading to insufficient nutrient intake for the fish. The factory later improved the nutrient retention capacity of the pellets by adding a binder.

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MIKIM's fish feed pellet production lines and supporting machinery offer excellent value for money. Not only are they affordable, eliminating middlemen markups and allowing small and medium-sized enterprises (SMEs) and fish farmers to purchase complete sets of equipment at reasonable costs, but they also boast exceptional efficiency. The fully automated process, from raw material crushing and precise ingredient mixing to extrusion pelleting and maturation, is completed in one continuous flow. This results in high starch gelatinization rates and uniform pellet formation, significantly improving production efficiency and feed quality, truly achieving "low cost, high output." Choosing a MIKIM fish feed pellet production line means enjoying comprehensive pre-sales and after-sales service, including 24-hour online customer support, a one-year warranty on the entire machine, professional on-site installation, commissioning, and maintenance, and a stable supply of spare parts. Customers can buy with confidence and use with peace of mind, with both excellent value and service quality!

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