When importing frozen tilapia (or any frozen seafood), one detail that significantly impacts what you actually get is the glazing percentage. Glaze is the thin ice layer applied to frozen fish to protect it. Choosing the appropriate glaze level – typically anywhere from 0% up to 20% – is an important decision for importers because it affects product quality, net weight, and cost. Here’s a guide on glazing and how to pick the right percentage for your needs.

What Is Glaze and Why Use It?

Glaze is simply ice. Processors dip or spray the frozen fish with water, which then freezes around the product. This ice coating prevents oxidation (freezer burn) and dehydration during storage. Think of it as a protective shell keeping the fillet fresh. Adequate glazing of around 6–10% of the fillet weight can protect against dehydration and quality loss. Without glaze, a frozen fillet over time would dry out, get tough edges, and lose flavor. So glaze is good – but only to a point. Excessive glaze is generally seen as cheating the customer, as it means you’re paying for a lot of ice instead of fish.

Understanding Net Weight vs Gross Weight

Frozen seafood is sold by gross weight (including glaze), but the actual fish content (net weight) is less once glaze is removed. For example, a 1 kg pack of tilapia with 10% glaze contains 0.9 kg of fish and 0.1 kg of ice. Importers need to be aware of this because ultimately you want to know how much fish you’re getting for your money. Reputable suppliers will specify the glaze percentage and often ensure net weight meets the contract spec after deglazing. In some jurisdictions (like the EU and U.S.), regulations require that packaging indicate if glaze is included and in the U.S., commercial practice is net weight excluding glaze for invoicing. But unscrupulous suppliers might over-glaze to effectively charge for water. That’s why choosing and controlling glaze percentage is crucial. See our best practice supplier vetting tips for how to enforce this.

Common Glazing Percentages

  • 0% Glaze (Dry Pack): No protective ice layer. It’s uncommon except for products frozen in airtight vacuum packs. Without glaze, quality can suffer unless packaging is excellent. If you go this route, ensure the product is vacuum-sealed or ice glazed inside the pack by the supplier to avoid dehydration.

  • 5% Glaze: A very light glaze. This provides minimal protection but maximizes fish content. It’s often used for IQF fillets that will be used relatively quickly. If storage is short-term or shipping is quick, 5% might be sufficient.

  • 10% Glaze: A moderate glaze. This is a common compromise – enough ice to guard quality for many months, but not so much that it’s clearly excess. Many importers opt for this percentage.

  • 20% (or higher) Glaze: Heavy glaze. Occasionally used for those needing long storage or to reduce the price of the good. However, at 20%, one-fifth of what you pay is water. Most buyers try to avoid this unless they have specific reasons. In some cases, a supplier might standardize on 20% glaze to ensure absolutely no dehydration even in longer supply chains. If you do accept 20%, you might negotiate a lower price knowing fish yield is less.

Quality vs Cost Trade‑off

The more glaze, the better preserved the fish – up to a point. Adequate glaze prevents freezer burn and oxidation. For instance, if you plan to keep tilapia in storage for a year, a 2% glaze could evaporate over time leaving the fish unprotected; 10% would likely hold up. But beyond ~12%, additional glaze yields diminishing returns on protection and simply adds weight. Excess glaze means the end-customer is essentially paying for water (and may notice they got fewer fillets than expected in a given weight). In fact, glaze above 12% significantly affects customer satisfaction and economic value.

Choosing the Right Percentage

  • Consider Storage Duration: If your product will be sold and consumed quickly, you can opt for lower glaze (5-8%) to maximize fish per box. If it might sit in cold storage for many months, lean towards ~10% to ensure protection throughout.

  • Consider Transit and Handling: Long ocean transits in warm climates (or multiple load/unload cycles) can sublimate some of the ice. A slightly higher glaze (perhaps 10-12%) can buffer against that. If shipping is short or highly controlled, 5% might suffice.

  • Know Your Market: Some markets are accustomed to a certain glaze level. For instance, EU importers often insist on declaring net weight, effectively limiting glaze to what’s needed for protection (~ glaze is not counted in declared weight). In the U.S., as long as the label is accurate, glaze can vary, but sophisticated buyers will push for low glaze/high net weight. If you’re supplying government contracts or certain large clients, they may have a standard (e.g., “must be 95% net weight of declared”). In South America, glaze can go up to 60%.

  • Negotiate Price Accordingly: If a supplier offers an extremely low price but with 20% glaze, do the math: adjust it to net weight to compare with other offers. Sometimes a higher gross price with lower glaze actually yields more fish for the money. As an example, 1000 kg of product at $2.00/kg with 20% glaze = 800 kg fish, effectively $2.50 per kg of fish. Meanwhile, 1000 kg at $2.20/kg with 5% glaze = 950 kg fish, which is ~$2.32 per kg of fish – actually cheaper in real terms and better quality. So always calculate cost per net weight.

  • Inspect and Communicate: Make it clear to suppliers that you will be checking net weight. You can even reference standards (for instance, the FAO Codex Stan for frozen fillets requires truthful net content). This deters any temptation to over-glaze. Reputable suppliers will typically glaze tilapia fillets around 5-10% unless asked otherwise. Whole fish often carry slightly higher glaze (to get into cavities), but still usually under 10%.

If you’re ready to source high-quality frozen tilapia or want a custom quote, visit our Tilapia product page to get started today. You can also check out our full guide on tilapia sourcing and market dynamics.

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