Flatfish grader

Custom grading solutions

Flatfish like such as sole, place, and turbot, etc are gutted at sea. The next step is grading, which can be done on the vessel or on shore. Flatfish require a sophisticated grader approach as sizes they can vary in size, from small to very large. MARELEC designs multiple infeed, grading, and batching systems according to available space and requested capacity. MATRIX allows you to generate production reports.

Key benefits

  • High accuracy
  • Optimum product handling
  • Ergonomic, robust, and hygienic design
  • Use of standard components
  • Multiple packing solutions
  • Marine execution available
  • Simple to operate
  • Easy connection with MATRIX software
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Flat fish is graded at the further processing plants prior to filleting. Fish auctions grade higher-value fish in order to sell them at the best possible price. To minimize the time between catch and delivery, fine grading is done on MARELEC Marine graders on board the vessels. MATRIX software helps captains to keep track of the catch.


  • Belt width: 254 up to 450 mm / 10 up to 18 inches
  • Max. weight: up to 5 kg/ 10 lb
  • Max. length: up to 500 mm / 1.64 ft
  • Max. capacity: up to 120 ppm
  • Lanes: 1/2/3/4
  • Multiple infeed and sorting solutions
  • Various label printing and software options
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Product handling

Optimum product handling is the way to keep quality and capacity high. Processing sites with high-speed graders grade up to 1,000 fish per minute.

Ergonomic design

A team of engineers translates your sorting and packing requirements into a custom grading solution. Full consideration is always given to the ergonomics for the operators. This flexible approach guarantees the perfect solution for the application while maintaining the maximum throughput as a priority with the smallest possible footprint.

Robust and hygienic design

All graders have a completely open structure, without any hidden corners, for full ease of cleaning and disinfection. The design of the graders avoids horizontal surfaces. Batching stations can easily be opened for optimum hygiene.  All electrics and electronics are in completely sealed cabinet with a unique hygienic labyrinth double sealing. All materials used are FDA approved. To avoid housings and reductors, all motors are silent stainless steel drum motors with IP 66 or higher protection.

Multiple packing and sorting solutions

Flat fish is packed in trays, boxes, or tubs. Alternatively, the fish is sent for secondary processing. In most cases, it is packed in fixed-weight batches where minimal giveaway is a crucial factor for achieving profits. The marine grader installations are made from high-grade steel and have active motion compensation.

Easy connection with MATRIX software

The interface is quick, user-friendly and intuitive to program. Over 100 programs can be stored. Production data can be viewed on the HMI grader. The user-friendly MATRIX program stores processing data on an office PC for traceability. In addition to full traceability, MATRIX CG will provide you with valuable KPIs to monitor and further control your process.

Subject to modifications for technical progress
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