Crystal Red and Crystal Black Patterns: How to Read a Shrimp's Grade by Eye

The listing says "SS Hinomaru" and the photo shows a tiny red and white shrimp. But is that red spot really a Hinomaru, or just a trick of the light? With Crystal Red and Crystal Black shrimp, a grade looks like a label, but it is really a matter of reading the shrimp: once you know where to look, you can make a rough estimate in a few seconds. This guide is here to train that eye.

Shrimptist · November 1, 2026 · 9 min read · 🌐 Türkçe Deutsch 日本語 繁體中文

A short backstory: where did these shrimp come from?

The Crystal Red story begins in Japan. In the 1990s, Japanese breeder Hisayasu Suzuki noticed a red individual among his black and white bee shrimp; he then found a few more and bred them selectively. Sources give different years (1993 and 1996 are the most common), but the core of the story is the same: every red and white shrimp you see today traces back to this small start and years of selective breeding. In Japan, these shrimp are still called "red bee."

Crystal Black (CBS) is the black and white side of the same line. When reading grades, both are judged the same way: think of the red areas on a CRS, or the black areas on a CBS, as "the color." For simplicity we will mostly say "red" in this guide; for CBS, the same applies to black.

Training your eye: read the shrimp in three zones

Grade charts usually sum it up in one sentence: "the more white, the higher the grade." True, but not enough. To see the real difference, look at the shrimp from above, split it into three zones, and watch where the white spreads:

• Head: the shell just behind the eyes. In high grades, white starts covering the shrimp from here, and most named patterns form on the head.
• Mid-body: the colored band across the middle of the back. As the grade rises, this band first gets thinner, then breaks, then shrinks to a spot, and finally disappears.
• Tail: the last segments and the tail fan. In low grades it is colored or semi-transparent; in high grades the white reaches all the way down to the tail.

This three-zone split is a method we suggest to make reading easier; it is not an official standard. But once you look at listings this way, you will quickly see why shrimp sold under the same grade name can look so different from one another.

The table is a rough road map. Breeders draw the lines differently; a shrimp one seller calls S, another may call A. For the general logic of grading and the Neocaridina classes, see the shrimp grading guide.

White quality: "a lot" is not enough, it also has to be "good"

Two shrimp can have the same amount of white, yet one clearly looks more valuable. The difference lies in the quality of the white. What breeders look at:

• Opacity: Good white looks thick and glossy, as if painted on. If you can see internal organs, muscle or greenish tones through it, the white is "thin," and that lowers the grade.
• Tone: The white should not have a yellowish or grayish cast. Cloudy, dirty-looking white is a sign of lower grades.
• Clear windows: Small glass-clear patches in the middle of a white area break up the pattern and lower the value.
• Quality of the colored areas: The red should be deep and solid; pale, orangey or semi-transparent red pulls the same shrimp down a step. The same goes for the black on a CBS: dark and dense.

And one surprising note: according to some breeders, a completely white shrimp, while rated very highly, is not placed at the very top. What this hobby looks for is a balanced look where white and color are sharply separated. That is also why the most sought-after SSS patterns carry "a small but crisp patch of color."

Pattern glossary: how to recognize the names

Most pattern names come from Japanese and are interpreted a little differently from seller to seller. The definitions below are the meanings shared by most sources. Judge all of them by looking from above; a side view hides most patterns.

Around S: where the bands change shape

• Three white bands / four white bands: White and red bands lined up evenly along the body. With four bands, the tail also ends in white; with three, the last section stays red or semi-transparent. These also appear in A grades; neatness and density make the difference.
• Tiger Tooth: The middle red band is not a full ring; a white triangle cuts into its lower part, so the band reaches down like two teeth.
• V-band: The middle red area has turned into a triangle shaped like the letter V. It resembles Tiger Tooth, but with less red.

These patterns can lift a plain S up a step, to something like "S+." How sellers use "S+" varies, too.

Around SS: where the band becomes a spot

• Hinomaru: Japanese for "circle of the sun," and the name of the Japanese flag. There is a single round red spot on a white back. The sharper and rounder the spot's edge, the more valuable it is considered.
• No Entry: A thin white line runs through the middle of the Hinomaru spot, so it looks like a "no entry" traffic sign. In Japanese, too, it is named after that same sign.
• Double Hinomaru: In addition to the round spot on the back, there is a second small red dot toward the tail.

Around SSS: where the color retreats to the head

• Mosura: The body is almost entirely white; the color remains as a small accent on the head, and sometimes at the tip of the tail. The name is said to come from Mosura (Mothra), the giant moth of Japanese cinema, but there is no definitive source for this.
• Mosura has sub-names based on the shape of the color on the head:
  • Crown: The color on the head meets the white along a half-circle edge, like a crown. Sources describe the details a little differently; compare with photos.
  • Flower head: A white spot in the middle of the colored area on the side of the head; from the side it looks like a flower.
  • Heart: The pattern on the head looks heart-shaped from the side.
  • Smiley: The color is reduced to a dot on top of the head and a line behind it; from above it looks like a smiling face.

Note: These names are not separate species or fixed, separate lines; they are names given to appearances. Not all offspring from two Hinomaru parents will be Hinomaru; many will show a different pattern.

Five things that throw off your grade reading

1. Lighting. Blue or dim light can make pale white look brighter and red look darker than they really are. Judge under white light or daylight, and ask the seller for a video shot that way too.
2. Photo filters and angle. Phones' automatic color correction and close-up shots can make white look "painted on." A short video is more honest than a single still.
3. Age. Juveniles' colors settle as they grow; comparing a juvenile to an adult grade is misleading. In aging shrimp, color and opacity may fade a little; their genetics stay the same.
4. Stress and hunger. A shrimp that has just been shipped, is hungry, or is living in poor water can look pale. That does not mean its grade has dropped; the color can come back once conditions improve. For water parameters, see the Caridina care guide.
5. Looking from only one angle. A shrimp that looks flawless from above may have clear windows on its sides. Check the pattern from above first, then the density of the white from the side.

Grade your own shrimp with three questions

When looking at a shrimp of your own or at a listing, ask these three questions in order. This is a practical method we suggest; it gives you a good starting point for comparing against the seller's grade label.

If you are not sure about all three questions, that is fine: an eye for grades develops with practice. The best training is to compare shrimp from the same tank side by side and keep photos of them.

Common questions about grade labels

Is a Hinomaru SS or SSS?

Hinomaru is generally regarded as the symbol of SS. But some sellers may also sell a very clean, opaque Hinomaru as SSS. Look at the sharpness of the spot and the density of the white rather than the label.

Will the offspring of two SSS shrimp also be SSS?

No, not all of them. Offspring usually come out mixed: some as good as the parents, some lower. Raising the average of a line is a job of selection that takes generations; details are in the selective breeding guide.

Is a higher-grade shrimp hardier?

No. Grade only describes appearance. Activity, appetite and clean molts have to be judged separately.

So which one should you buy?

If you are just starting out, A or S grade is a good place to begin: their colors are even and opaque, they are more affordable, and you will not be learning the basics of care with an expensive colony. What matters is numbers: instead of a single SSS, several healthy shrimp from the same line give you better chances for both breeding and selection. If you want to work with high grades, ask the seller for a video of the actual shrimp, and observe newcomers for a short while before adding them to your main tank.

Sources

• Wikipedia: Caridina cantonensis (origin of Crystal Red, Hisayasu Suzuki)
• U.S. Fish & Wildlife Service: Bee shrimp ecological risk screening summary (government agency; species and origin information)
• The Shrimp Farm: Grading Crystal Red Shrimp (breeder guide; pattern definitions)
• Gensou: Crystal Red Shrimp Grading Guide (seller guide; white quality and lighting)
• PetShrimp forum: origin of Crystal Red and CRS grades (hobbyist discussions)

The values and advice in this guide reflect what is widely accepted in the shrimp hobby. They can vary with the line, your water and the breeder your shrimp came from. Make changes to your tank in small steps.

Want to meet other shrimp keepers? Take a look at the ShrimpSocial community.