Fish Feed Machine

1. What is fish feed?

Fish feed is a complete manufactured diet — protein, fat, starch, vitamins and minerals — processed into stable pellets that fish can actually eat and digest. It comes in four main types, chosen by water layer, fish species and growth stage:

1. Micro-diet / crumble (0.1–1.5 mm) — powder and fine crumbs for larvae and fry.
2. Shrimp sinking pellet (0.8–2.5 mm) — dense, smooth, water-stable for shrimp and crabs.
3. Sinking hard pellet (2–8 mm) — ring-die pressed, sinks fast, economical for bottom-feeders.
4. Floating extruded pellet (0.8–12 mm) — puffed by twin-screw extrusion, floats for hours, standard for tilapia, catfish and carp.

One SunPring twin-screw line runs all four — change the die and the process, not the machine.

2. How to make floating fish feed?

Floating fish feed is produced by twin-screw extrusion: starch is cooked under heat and pressure, then puffed into porous, low-density pellets that stay afloat for up to 12–24 hours.

Key process:

1. Grinding – Raw materials (corn, wheat, fish meal) are ground into fine powder.
2. Mixing – Starches, proteins, oils and additives are blended into a uniform formula.
3. Conditioning – Steam and water pre-cook the mash to gelatinize the starch.
4. Extrusion – Twin-screw extruder cooks at 110–150°C under high pressure; the sudden pressure drop at the die puffs the dough into buoyant pellets.
5. Drying & Coating – Pellets are dried to safe moisture, then coated with oil and attractants.
6. Cooling & Packing – Finished feed is cooled, screened and bagged.

Key parameter:

• Buoyancy: pellets float 2–24 hours（Adjust according to the target fish species.）
• Starch content ≥15–20%( It is the key to extrusion and buoyancy.)
• Pellet size 0.3–12 mm（Change molds according to fish species.）

Building your own floating fish feed line? SunPring twin-screw extruders produce 200–8000 kg/h — contact us for a free line design and quote.

3. How to make Sinking fish feed?

Sinking feed is the opposite of floating feed: instead of puffing the pellet up, the line packs it dense — above the density of water — so it drops straight to the bottom where shrimp, crab, catfish and grouper feed.

1. Grinding — Corn, wheat and fish meal are milled into a fine powder.
2. Mixing — A low-starch (10–18%), high-protein formula — starch acts as a binder, not an expander.
3. Conditioning — Steam pre-cooks the mash for 60–180 seconds so the pellet holds together in water.
4. Forming — Ring-die pressing at 80–95°C, or low-shear “zero-expansion” extrusion — pellet density rises above 1.0 g/cm³.
5. Drying — Pellets are dried to a safe moisture level.
6. Cooling & Packing — Cooled, screened and bagged.

Key parameters — density >1.0 g/cm³ (typical 1.1–1.4) · starch 10–18% · forming 80–95°C (press) or 90–130°C (extruder) · water-stable 2–4+ h · species: shrimp, crab, catfish, grouper, carp.

SunPring’s twin-screw extruder makes both floating and sinking feed — get a free line design and factory-direct quote.

4. Why Feed Plants Choose SunPring?

Sinking feed is the opposite of floating feed: instead of puffing the pellet up, the line packs it dense — above the density of water — so it drops straight to the bottom where shrimp, crab, catfish and grouper feed.

A factory-direct twin-screw line that runs both floating and sinking feed — built in Jinan, China since 2010.

1. Factory-direct, not a trader — no middleman markup. OEM and private-label orders welcome.
2. One line, two products — the same twin-screw extruder makes floating and sinking pellets; just change screw configuration and formula.
3. Scales with you — SP200S to EC5500S, from 200 to 8000 kg/h. Start small, expand later.
4. Built to last — stainless steel contact parts, self-cleaning alloy screws, Siemens / ABB motors, full PLC automation.
5. Certified & supported — CE, SGS, ISO9001. 1-year warranty, overseas engineer service, video inspection before shipment.
6. Your market, your spec — local voltage, custom pellet shapes (ball / star / bone / flower), custom packaging.

Tell us your target capacity — get a free line design and factory-direct quote within 24 hours.

SunPring Feed Extruder SP Series

SunPring Feed Extruder ENCREA@EC Series

SunPring Feed Extruder ENCREA@ECTS Series

5. Fish Feed Extrusion Production Line Specfication

Send Inquiry for Floating Fish Feed Machine Now! We still have more types for your choose! Good price, best quality, local service! SunPring helps you from learner to expert!