This guide takes you through ice-slurry slaughter for tilapia and pangasius — a method that improves quality, eliminates fish dying during transport, and earns you more at market. Tap Next to begin.
When fish are killed by air, struggle, or insufficient ice, you lose money in three places: at the market (lower quality), in transport (mortality), and in shelf life (faster spoilage). Cold, done right, fixes all three.
When you transport live fish, some die on the way from stress and low oxygen. With chill-kill, your fish are already on ice — every fish you load arrives.
Cooling fish to near 0 °C within minutes slows bacterial growth dramatically. Properly chilled fish keep fresh for 5–7 days on ice instead of 1–2.
Stressed fish use up muscle energy, which softens flesh and produces lactic acid. Quick chill = firmer texture and brighter colour.
Fewer broken scales, no bruising from flapping, no torn fins — fish look better and fetch a higher price.
Hotels, restaurants and export buyers increasingly require humane slaughter records. This method meets those requirements.
It is also better for animal welfare — fish lose consciousness in cold water faster than in air.
Gather these before you start. You probably already have most of them. Crushed or flaked ice works far better than block ice — see the tip below.
Enter your tank size, your fish, and the water temperature. The calculator returns the kilograms of ice to buy for one batch.
Pre-cool the slurry before you catch fish. Warm water absorbs a lot of the ice you bought to chill the fish.
Once the thermometer says the bath is cold enough, move fish from the pond straight into the slurry. The shock of cold knocks them out within a minute or two.
Once the fish are in the slurry, leave them there for at least 20 minutes. The cold first stuns and then kills the fish — but the kill needs time to be reliable.
Move the fish out of the slurry and into your cooler box, layered with ice on top and bottom. Do not pile them in a heap. Refresh the ice during long trips.
Sell or process within 24 hours for best price. With a proper cold chain, the fish keep fresh on ice for 5–7 days.
Thermometer is stuck above 4 °C even after 20 minutes.
Add more ice and stir well. If you bought the amount the calculator suggested but you're still warm, your tank may be in direct sun — move it under cover. Don't load fish until the reading is below 4 °C.
A fish moves when I pull it out at 20 minutes.
It hasn't been chilled deeply enough — usually because the bath warmed up too much during loading or holding. Put it back in fresh cold slurry for another 10–20 minutes.
My ice blocks aren't melting fast enough.
Block ice cools slowly. Break it up before use — wrap the block in a clean sack and hit with a flat tool. For regular use, consider a small ice crusher.
Fish look bruised or have torn fins after.
Either you handled them too hard during loading or the tank was overcrowded. Both reduce price. Aim for a single layer of fish with slurry around each one.
Buyers say my fish "smells off" after a day.
The cold chain broke somewhere — usually during transport. Check that fish are layered with ice in transport containers, not just put in a bucket.
Can I reuse the same slurry for a second batch?
Only if you remove all fish, top up the ice to fresh-slurry consistency, and check the thermometer reads below 1 °C again. Often easier to start with fresh water and ice for the next batch.
Done with this batch. Start over from the beginning · Open research calculator