Sustainable Aquatics arguably revolutionized the designer clownfish breeding world in 2013 with the announcement of the Frostbite Ocellaris Clownfish, as I first discussed on Reef Builders. This fish represents the first multi-gene, pure species designer clownfish created, combining the Snowflake gene and the Davinci gene in a single fish to create the new Frostbite phenotype.
Since that introduction, Sustainable Aquatics started with two separate grades, which have now grown to four unique grades of this genotype. “Flurry” Frostbite Ocellaris Clowns are mostly white, “Chilled” Frostbites may show a spot or two on the flanks, “Frozen” Frostbite Clownfish carry a fair amount of black spots on white flanks, while the Sub-Zero or Subzero Frostbite Ocellaris Clownfish is heavily spotted. From where I sit, it appears that for a Frostbite to be considered a “Sub Zero”, it should have holes / spots above the lateral line as well as below, and likely has more than 10 spots per flank. The size and distribution of those spots can vary dramatically.
There is still quite a bit of variation in the grading of these clownfish, and the dividing line is rather subjective, some people’s “Sub Zero” might be other poeple’s “Frozen”."