SED’s oyster grading systems are a proven way to save you time and money

Automatic Oyster Grading Systems

SED oyster grading systems are a reliable, proven way to improve your business. It takes around 13 hand graders to match the SED grader.

Automatic – separate, clean, measure, sort, count and bag
Fast – 1,200 to 2,000 dozen oysters per hour
Accurate – 99% counting accuracy – more consistent than hand grading
Gentle – oysters sorted by cushions of air; studies confirm this is gentler on oysters than hand grading
Versatile – with a wide range of production enhancing ancillary equipment including feeders, inspection conveyors, washers, baggers and bulk handling

Auxillary Equipment


High Production / Minimal Labour: Depending on oyster size and condition, an average processing speed of 1,200 dozen per hour (with recorded top speeds of 2,000 dozen per hour) is attainable, with only one operator to change bags and a counting accuracy of around 99%.

Fast Payback: It takes around 13 hand graders to match the SED grader, where only one worker is required to change bags or baskets.

Grades By Your Own Program: You set the sizes and bag numbers. Quick and easy to change.

Sorts: 4, 6, or 8 grade exits available.

High Quality Materials: Manufactured from stainless steel, our graders are robust and designed for harsh and remote environments.

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Seed and Juvenile Graders

Processing oysters underwater dramatically reduces handling damage and minimises death rates, thus increasing profits.

  • Quiet
  • Low Cost
  • Gentle
  • Automatic
  • Grades Seed/Juveniles from 3 to 50mm
  • Twin Barrel is Even Faster
  • Consistent Grades

This machine is very gentle on the product. Traditional juvenile barrel and shaker graders produce lots of stress for oysters, in most cases killing a percentage and stunting the growth of others. Due to the way oysters behave underwater, grading is more consistent than the existing barrel and shaker graders.

Low Labour Costs

SED, in association with Bolduans Bay Oysters in Tasmania, has developed the underwater grading system specifically to reduce mortality rates and reduce labour costs.

If the grading line includes some of the SED in-feed options and baggers, oysters can be emptied into a bulk hopper, washed, measured, separated into grades and bagged. Operators are only required to empty the baskets or trays into the bulk hopper and feed the baggers at the end of the line.

The operator simply fills the hopper (for juvenile) or seed table, and the grader does the rest. Oysters are sorted underwater into three sizes before being delivered by 3 small conveyors to collection points. If optional baggers are added, then a set volume of shellfish can fill baskets at up to 30 per minute feed rates.

About 100,000 oysters per hour (size 25 to 35mm) can be processed on a single lane system.

Seed Processing

Juvenile Processing

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