by
Nils Lastein, Global Application Manager, Andritz, Denmark
For shrimp feed to have the desired effect—that is to provide optimal energy for maximum growth—it must meet the following characteristics: Shrimp feed pellets must achieve 100 percent sinkability and have a water stability greater than two hours.
However, the starch is used to hold pellets together has no real nutritional value for shrimp. Therefore, a process that allows for starches to be replaced by protein can further support the goal of an optimised feed conversion ratio.
However, there are quite a few additional factors to consider when determining
the best process solution for your shrimp feed manufacturing facility. Shrimp
feed can be produced either by pelleting or extrusion, and each of these
processing techniques has its pros and cons. Here we make a side-by-side
comparison to help processors determine the best course of action for their
individual facility and circumstances:
Pelleting
When pelleting, grind quality is very important. When oversized or inconsistent particles are encountered in the feed ingredients, pellet durability is adversely affected. While both processes will benefit from the addition of grinders or pulverisers, when choosing the pelleting process for your shrimp feed production, consider the addition of classifiers for the processing of recycling oversized particles.
The pelleting process is highly sensitive to excessive moisture content; high moisture causes rollers to slip and consequently creates machine blockages. Therefore, post-conditioning is a necessary step in the pelleting line, in order to achieve a suitable level of starch cooking, and to meet the requirement for water stability.
Pelleted feed is a densification process by nature and, therefore, coating feed with liquid palatants or wet nutritional ingredients (fats and oils) post-pelleting can be a challenge. Another factor that affects pellet quality is control of pellet size and length, which poses additional process challenges.
While there are challenges with producing a high-quality shrimp feed pellet on a pellet mill, the process is a long-standing industry technique making hiring and training accessible.
Read more HERE.
For shrimp feed to have the desired effect—that is to provide optimal energy for maximum growth—it must meet the following characteristics: Shrimp feed pellets must achieve 100 percent sinkability and have a water stability greater than two hours.
However, the starch is used to hold pellets together has no real nutritional value for shrimp. Therefore, a process that allows for starches to be replaced by protein can further support the goal of an optimised feed conversion ratio.
Pelleting
When pelleting, grind quality is very important. When oversized or inconsistent particles are encountered in the feed ingredients, pellet durability is adversely affected. While both processes will benefit from the addition of grinders or pulverisers, when choosing the pelleting process for your shrimp feed production, consider the addition of classifiers for the processing of recycling oversized particles.
The pelleting process is highly sensitive to excessive moisture content; high moisture causes rollers to slip and consequently creates machine blockages. Therefore, post-conditioning is a necessary step in the pelleting line, in order to achieve a suitable level of starch cooking, and to meet the requirement for water stability.
Pelleted feed is a densification process by nature and, therefore, coating feed with liquid palatants or wet nutritional ingredients (fats and oils) post-pelleting can be a challenge. Another factor that affects pellet quality is control of pellet size and length, which poses additional process challenges.
While there are challenges with producing a high-quality shrimp feed pellet on a pellet mill, the process is a long-standing industry technique making hiring and training accessible.
Read more HERE.
The Aquaculturists
This blog is maintained by The Aquaculturists staff and is supported by the
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