Adjustable aluminium bars
Multiple grading ranges across the lineup suit various species and sizes — set the spacing to the size class you want to separate.
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Fresh-Flo MAG Fish Graders
Fresh-Flo MAG Fish Graders
Fresh-Flo aquaculture equipment
MAG Fish Graders
Adjustable aluminium bar graders from Fresh-Flo Corporation — precise fish sorting that floats in fresh and saltwater, with manual size changes in seconds and no extra tools or racks.
Special Ordercontact us for details
4grader models
20–50grading settings
50+years Fresh-Flo experience
Special order itemAdjustable aluminium bars · Floats in fresh & saltwaterManual adjustment — no toolsLess handling stress
✓ Sturdy aluminium construction✓ Floats in fresh and saltwater✓ Quick manual size changes✓ Built for hatcheries and fish farms
Fresh-Flo Corporation has been a trusted leader in aquaculture solutions for over 50 years, specialising in innovative, high-quality equipment designed to support sustainable fish farming and aquarium operations. Known for durability and efficiency, Fresh-Flo products are crafted with precision to enhance productivity while ensuring the health and well-being of aquatic species. From water aeration systems to fish graders, their equipment is built to last and perform in the toughest environments.
The MAG difference
Sort faster. Stress fish less.
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Lightweight floating design
The graders float and operate easily in both fresh and saltwater environments, so sorting happens in the water, not on a bench.
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Less handling, less stress
Quick sizing changes without extra tools or racks reduce fish handling time while minimising stress and damage.
The lineup
Four graders. Every size class.
MAG Grader — Standard Model 1
The all-round workhorse. Bar widths adjust from 1/4 inch to 1 1/8 inches across 30 precise settings for general sorting duty.
- Grading range: 1/4" – 1 1/8" (6.35 – 28.58 mm)
- Settings: 30 divisions
- Dimensions: 15 × 17 × 11.5" (381 × 432 × 292 mm)
- Weight: 17 lb (7.7 kg)
- Material: sturdy aluminium construction
- Flotation: floats in fresh and saltwater
- Operation: manual adjustment for quick size changes
MAG Grader — Standard Model 2
Built for smaller fish. Bar adjustments run from 1/8 inch to 1 inch across the same compact floating chassis.
- Grading range: 1/8" – 1" (3.18 – 25.4 mm)
- Settings: 30 divisions
- Dimensions: 15 × 17 × 11.5" (381 × 432 × 292 mm)
- Weight: 17 lb (7.7 kg)
- Material: sturdy aluminium construction
- Flotation: floats in fresh and saltwater
- Operation: manual adjustment for quick size changes
MAG Grader — Standard Model 3
For the smallest fish. An adjustment range starting at zero for fine fry-class separations.
- Grading range: 0 – 9/16" (0 – 14.29 mm)
- Settings: 20 divisions
- Dimensions: 15 × 17 × 11.5" (381 × 432 × 292 mm)
- Weight: 17 lb (7.7 kg)
- Material: sturdy aluminium construction
- Flotation: floats in fresh and saltwater
- Operation: manual adjustment for quick size changes
Super MAG Grader
The high-capacity upgrade for large-scale operations, with the broadest range and the most settings in the lineup.
- Grading range: 5/32" – 1 3/8" (3.97 – 34.93 mm)
- Settings: 50 divisions
- Dimensions: 21 × 28 × 16" (533 × 711 × 406 mm)
- Weight: 35 lb (15.9 kg)
- Material: sturdy aluminium construction
- Flotation: floats in fresh and saltwater
- Operation: manual adjustment for quick size changes
How to use
Grade in four steps
- Set the bars. Manually adjust the aluminium bar spacing to the size class you want to separate — no tools or racks required.
- Float it. Place the grader in the tank, pond or raceway. It floats and works in both fresh and saltwater.
- Pass the fish through. Smaller fish swim through the gaps; larger fish are retained for the next pass.
- Re-adjust and repeat. Change the setting in seconds to sort the next size class, keeping total handling time low.
Specifications
Compare the lineup
| Model | Grading range | Settings | Dimensions | Weight | Material | Flotation | Operation |
|---|---|---|---|---|---|---|---|
| MAG Grader — Standard Model 1 | 1/4" – 1 1/8" (6.35 – 28.58 mm) | 30 divisions | 15 × 17 × 11.5" (381 × 432 × 292 mm) | 17 lb (7.7 kg) | Sturdy aluminium construction | Floats in fresh and saltwater | Manual adjustment for quick size changes |
| MAG Grader — Standard Model 2 | 1/8" – 1" (3.18 – 25.4 mm) | 30 divisions | 15 × 17 × 11.5" (381 × 432 × 292 mm) | 17 lb (7.7 kg) | Sturdy aluminium construction | Floats in fresh and saltwater | Manual adjustment for quick size changes |
| MAG Grader — Standard Model 3 | 0 – 9/16" (0 – 14.29 mm) | 20 divisions | 15 × 17 × 11.5" (381 × 432 × 292 mm) | 17 lb (7.7 kg) | Sturdy aluminium construction | Floats in fresh and saltwater | Manual adjustment for quick size changes |
| Super MAG Grader | 5/32" – 1 3/8" (3.97 – 34.93 mm) | 50 divisions | 21 × 28 × 16" (533 × 711 × 406 mm) | 35 lb (15.9 kg) | Sturdy aluminium construction | Floats in fresh and saltwater | Manual adjustment for quick size changes |
Special order supply
Special order — contact us for details
Made to order
Fresh-Flo graders are supplied as a special order item. Contact BTA for current pricing, availability and lead times.
Pick your model
Tell us your species, size classes and throughput and we will match you to the right MAG or Super MAG grader.
Australian supply
BTA supplies Fresh-Flo aquaculture equipment to fish farms, hatcheries and aquarium operations across Australia.
Frequently asked questions
MAG Grader FAQs
Which grader suits my fish sizes?
Standard Model 1 covers 1/4" to 1 1/8" for general duty, Model 2 runs 1/8" to 1" for smaller fish, Model 3 grades from zero to 9/16" for the smallest fish, and the Super MAG spans 5/32" to 1 3/8" with 50 settings for large-scale operations. Contact BTA with your species and size classes for a recommendation.
Do I need tools or extra racks to change sizes?
No. The manual adjustment system allows quick sizing changes without extra tools or racks.
Can it be used in saltwater?
Yes. The graders are designed to float and operate in both fresh and saltwater environments.
How do the graders reduce fish stress?
Sorting happens in the water with fast size changes, which reduces total handling time and minimises stress and damage compared with bench-based sorting.
How do I order?
Fresh-Flo MAG graders are a special order item. Contact BTA for pricing, availability and lead times on the model you need.
Not sure which grader fits?
Send BTA your species, typical size classes and throughput. We will help you pick the right MAG model rather than guessing.
Talk to BTATrade & wholesale
Fish farms, hatcheries, aquarium wholesalers and maintenance teams can contact BTA for bulk Fresh-Flo equipment requirements and trade pricing.
Request trade pricingAsk a technical questionBiotech Aquatica · Australian supplier · btaqua.com.au
