Caviar Grades Explained: Kaluga, Osetra, and What the Numbers Mean

The caviar category has expanded dramatically since the CITES-driven collapse of wild Caspian fisheries in the 1990s and early 2000s. What was once a market defined by three species from one region now encompasses a global aquaculture industry producing wildly different products under the same broad label. Understanding species, grades, and quality indicators is prerequisite knowledge for anyone sourcing caviar for a serious program.

The Major Species

Not all caviar is equal — and species is the first variable that matters.

• Kaluga Hybrid (Huso dauricus × Acipenser schrenckii) — The workhorse of premium modern aquaculture. The Kaluga hybrid grows quickly relative to other sturgeons, producing large, firm beads with a clean, buttery flavor. It is frequently compared to Beluga in texture and bead size. This is TBGC's primary caviar offering and the product we recommend for most restaurant programs.
• Osetra (Acipenser gueldenstaedtii) — One of the three classic Caspian species, now farmed globally. Osetra produces medium-to-large beads with a notably complex, nutty flavor profile that distinguishes it from other species. Color ranges from olive-gold to dark grey-brown. Highly prized in fine dining for its expressive flavor.
• Sevruga (Acipenser stellatus) — The smallest of the classic three, producing small, dark beads with an intensely briny, assertive flavor. Less common in the US market today but prized by traditionalists for its boldness.
• Beluga (Huso huso) — The most legendary and legally restricted caviar in the world. Wild Beluga import into the United States is banned under CITES. Farmed Beluga is available in limited quantities from certified producers but commands extraordinary prices. The genuine article produces the largest beads of any sturgeon, with a famously delicate, almost creamy flavor.

What the Grade Numbers Mean

Within each species, caviar is graded by bead size, with the grading convention running from 0 (smallest) to 000 (largest). A tin labeled 000 represents the largest, most visually impressive beads from that harvest — which is why 000 commands the highest price within a species. That said, smaller grades (0 or 00) are not inferior in flavor; many connoisseurs prefer the flavor concentration of a slightly smaller bead, and savvy operators find excellent value at the 0 and 00 levels.

Color: Neither Gold Nor Dark Is Inherently Better

Caviar color varies by species, diet, and individual fish and ranges from pale golden-champagne to deep charcoal black. Color preference is largely a matter of aesthetics and has no reliable correlation with flavor quality. The storied "golden" or "imperial" osetra can produce extraordinarily pale, golden-hued roe — which is rare and commands a premium — but a deep olive Osetra from a prime specimen is equally excellent. When evaluating caviar, focus on aroma (clean oceanic scent, never fishy or ammonia-like), bead integrity (firm, not mushy), and flavor rather than color alone.

Salinity: Understanding Malossol

The most important salinity designation in fine caviar is malossol — Russian for "little salt." Malossol caviar is salted at approximately 3–5% by weight, the minimum necessary for preservation while allowing the natural flavor of the roe to remain primary. This is the standard for all serious fine dining caviar. Products salted above this range are shelf-stable for longer but lack the clean, fresh flavor that defines premium caviar. Always verify malossol designation when sourcing.

Storage and Service

Caviar should be stored at 34–38°F — below the standard refrigerator temperature for most other foods. An unopened tin in proper cold storage has a shelf life of four to six weeks from packing date. Once opened, caviar should be consumed within 24–48 hours. Never freeze caviar; freezing ruptures the bead membrane and destroys the texture entirely.

For service, use non-reactive spoons — mother of pearl is traditional and optimal, but bone, horn, or high-quality plastic are acceptable. Metal spoons (silver, stainless) impart a metallic note that compromises the flavor of delicate caviar. Serve directly from the tin, nestled in crushed ice.

TBGC's Caviar Program

TBGC offers Kaluga 000 and Osetra as primary SKUs, with allocations of additional species available seasonally. All tins are sourced from certified aquaculture producers with full CITES documentation, cold-chain shipped to arrive fresh, and dated on receipt. Minimum order quantities and pricing are available through your account manager. We recommend establishing a standing weekly allocation for restaurant programs to ensure consistent supply.