How to Produce Floating and Sinking Fish Feed: A Comprehensive Guide

In aquaculture, feed accounts for more than 50% of production costs. Choosing between floating and sinking fish feed—or producing both—depends on species, feeding habits, and production goals. By controlling feed buoyancy during manufacturing, farmers can improve efficiency, reduce waste, and boost profitability.

This article explains how floating and sinking fish feed are made, the factors that control buoyancy, and includes sample fish feed recipes you can adapt to your production line.

1.Understanding the Difference: Floating vs. Sinking Feed

Floating Feed
Produced via **extrusion**, where ingredients are cooked under high heat and pressure. The process expands the pellets, making them porous and buoyant.

–Easy to monitor feeding
–Reduces waste and water pollution
–Higher digestibility

Sinking Feed
Produced via pelleting or cold extrusion, creating denser pellets that quickly sink.

Cost-effective
Suitable for bottom-feeding fish like catfish, tilapia, shrimp
Retains higher nutrient density

2.Controlling Feed Buoyancy

Degree of Puffing (Expansion) – More expansion = floating feed; less expansion = sinking feed
Extrusion Temperature – Higher = floating; Lower = sinking
Raw Material Composition – More starch promotes floating; more protein/fiber promotes sinking
Moisture Content – Lower moisture (\~13%) = floating; higher (\~20%) = sinking

3.The flow chart of the fish feed prodcution machine line
Mixer machine—screw conveyor—extruder machine—dryer machine—Fat coating machine—packing machine. How to Produce Floating and Sinking Fish Feed.

4.Fish Feed Recipe Examples  How to Produce Floating and Sinking Fish Feed.
Here are sample formulations (percentages by weight). Recipes can be adjusted depending on fish type, growth stage, and local raw material availability.

A) Floating Fish Feed Recipe (for Tilapia, Carp, Trout)
 Ingredient
 Corn / Wheat flour (starch source)        30–35%
Soybean meal (protein)       20-25%
Fish meal (animal protein)        10–15%
Rice bran or wheat bran        10–15%
Vegetable oil / Fish oil         3–5%
Vitamin & mineral premix         1–2%
Binder (cassava starch, gelatinized starch)      1–2%
Optional additives (probiotics, enzymes, color enhancers)      0.5–1%
Processed in an extruder at high temperature (120–150 °C) to ensure puffing and floatability.

B) Sinking Fish Feed Recipe (for Catfish, Shrimp, Koi)
 Ingredient

Wheat bran / Rice bran                   | 25–30%     |
Soybean meal                             | 20–25%     |
Groundnut cake or cottonseed meal        | 10–15%     |
Fish meal / Blood meal                   | 8–10%      |
Cassava flour / Maize flour (low starch) | 5–8%       |
Palm oil / Fish oil                      | 2–3%       |
Vitamin & mineral premix                 | 1–2%       |
Binder (molasses, gelatinized starch)    | 1–2%       |
Processed using a pellet extrusion at lower temperature (\~100–110 °C), producing dense, sinking pellets.

5.Choosing the Right Feed Type

* Use floating feed when you want to monitor feeding behavior, reduce wastage, and improve digestibility.
* Use sinking feed for bottom-feeders or when production costs must be minimized.
* Many farms combine both (e.g., 20% floating + 80% sinking) for balanced feeding.

6.Final Thoughts
Producing floating and sinking fish feed requires balancing:
Equipment** (extruder vs pellet mill)
Ingredients** (starch vs protein ratios)
Processing conditions** (temperature, moisture, expansion rate)
By following the right formulation and process, you can manufacture high-quality feed tailored to your aquaculture species.

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