Length: 1210mm
Width: 590mm
Height: 700mm
Weight: 290kg


Trial details:

Ice machines

Trial 1

Trial 2

Trial 3

Trial 4

Trial 5

Trial 6

Follow-up project


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Industrial ice-making machines:

  • Pelagic fishing vessels

  • White-fish vessels

  • Poultry & beef transportation

System information | Case study | Applications | Example installations | S16 Slurry Ice System

Follow through project work

Lunar Filleting Peterhead.
After the catch was discharged in Ullapool the fish were transported to the north-east in refrigerated vehicles. As is normal practice when landing the majority of fish landed in boxes are auctioned on Peterhead Fishmarket while the fish landed in bins are contract sold to a small number of buyers. As part of the trial project work was arranged between the Master of Challenge II UL33, Seafood Scotland and Lunar Filleting, Peterhead, for follow through work to be carried out on the catch at the factory in Peterhead.
During the fishing trip two batches were compiled, each batch consisting of:

  • Two bins of small haddock containing 420kg each (liquid & flake ice)
  • 10 boxes of small haddock, each containing 40kg (5 liquid & 5 flake ice)

Batch 1 was packed at 1800 hours on 26th February.
Batch 2 was packed at 0300 hours on 1st March.

Quality evaluations and temperature checks were made in the factory of Lunar Filleting.

Temperature checks

Batch 1:

Below: Quality and temperature observations at
Lunar Filleting, Peterhead

Batch 2:

Temperature observations

  • The temperature of the fish stored in liquid-ice was consistent.
  • The fish stored in liquid-ice was generally colder than the fish stored in flake ice.
  • Only one temperature, the fish stored in flake ice, in boxes, had a temperature above zero
  • The factory workers handling the fish noticed a considerable temperature difference with fish stored in liquid-ice.

Quality and fillet observations.

After temperature checks were taken the fish were then tipped into a hopper to check the quality of the fish throughout the bin.

  • There were no signs of freezing in the fish stored in liquid-ice although the temperatures recorded were -1C.
  • There were slight signs of damage to the fish caused by the flake ice
  • It was agreed, by all present, that the fish stored in liquid-ice had a fresher appearance than the comparative bin.
  • The fish stored in liquid-ice were firmer.

A sample of fish from each bin of batch 1 was filleted to ascertain whether any visual difference were evident. Approximately 6 fish were filleted from each bin.

  • Very little visual difference
  • Fish stored in liquid-ice had fewer blood spots
  • Fish stored in flake ice were slightly softer, probably due to ice damage

Below: Sample of fillets in the laboratory in Lunar Filleting

Follow through work:

Trial involving fish kept in cold storage

The final part of the project work involved fish being kept in cold storage until they were unfit for human consumption. Seafish arranged to purchase two bins of small haddock from the catch of Challenge II UL33. Both these bins were filled with 420kg of fish, from the same fishing operation, with fish from one bin stored in liquid-ice and fish from the other stored in flake ice. The fish purchased by Seafish were packed at 1300 hours on the 26th February. Upon discharge of the catch in Ullapool the fish were transported to the premises of Stephen Buchan, in Peterhead, where they were kept in cold storage.

After daily checks on the quality of the fish from both bins it was agreed with Gavin Thain, Master of Challenge II UL33, that the fish should be thoroughly inspected on 11th March 2003, when the fish was 13 days old.

At 0900 hours on 11th March the fish were thoroughly inspected to assess differences in the shelf life of the two samples. A number of temperature checks were taken from both bins and each bin was tipped into another bin so visual differences could be evaluated throughout the bins.

Temperature checks being taken from the
bottom of the bin

13 day old fish being tipped in the yard of
Stephen Buchan, Peterhead

Range of temperature checks

Temperature observations

The average temperature of fish stored in liquid-ice was -0.5C The average temperature of fish stored in flake ice was +0.3C The average temperature of fish from the middle and bottom of the liquid-ice bin was 1C colder.

Quality and fillet observations
Quality observations were taken from each bin as the bins were being tipped, by a forklift, into another bin. Details as follows:

  • Eyes the eyes of the fish from both bins were sunken, although to a lesser extent with the fish stored in liquid-ice
  • Skin The skin from the fish stored in liquid-ice were of a better quality, with severe fading from fish stored in flake ice.
  • Gills The gills from the fish held in liquid-ice were turning pink in comparison to pink/brown gills from the fish held in flake ice
  • Firmness Fish stored in liquid-ice were firmer than the comparative fish
  • Mucus The mucus was yellow on the fish stored in flake ice, in comparison to clearer mucus on fish held in liquid-ice
  • Fillets No visual differences in the fillets were evident.

Although both bins of fish were in remarkably good condition, considering the age, it was apparent that the fish stored in liquid ice were of a better quality than the fish stored in flake ice. It is estimated that the fish from the bin of liquid-ice showed a longer shelf life of approximately 2 days. The improvement in shelf life is down to the initial temperature reduction when the fish are stored in the fishroom after the onboard handling.



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