Which Sulawesi Shrimp Is the Most Colorful?

You’ve settled on Sulawesi shrimp, and now you want the most colorful one you can get. Nobody has ranked Sulawesi shrimp by color, so pick the pattern you like best, then check it will still show in your tank. The 2009 revision that named most of these shrimp describes each species’ color pattern and then leaves it there.¹ That makes “most colorful” a judgment you make, not a figure you can look up. What you can do is read what each pattern actually is, and know which parts of it you’ll still see at home.

Has anyone actually ranked Sulawesi shrimp by color?

No. The closest thing to an authority is the 2009 taxonomic revision of the Sulawesi lake Caridina. It recognized 15 species in the Malili lakes and six in Lake Poso. It also says a number of the lake species show unusual and flamboyant color patterns, and that those patterns are species specific. During sampling, most species could be told apart on color alone, juveniles included.¹ That’s a long way from a ranking, and it’s as far as the evidence goes.

So when a care sheet tells you one species is the most colorful, that’s someone’s opinion with a price attached. We’d rather give you the descriptions and let you pick. One thing to know before you read them: they were written from wild animals in their own lakes, not from shrimp that just spent two days in a bag.

What each Sulawesi shrimp’s color pattern actually is

The 2009 taxonomic revision of the Sulawesi lake Caridina describes the color of six species the hobby actually sees. Those descriptions are below. The wording stays close to the original, because the original is the only version anyone wrote with the animal in front of them.¹

Read them side by side and the honest summary is that three different animals win three different arguments. C. spinata is the only one described with red and yellow or orange on the same body. C. woltereckae carries the banded harlequin shrimp pattern, which puts the most separate blocks of color on one shrimp. C. dennerli has the hardest contrast: a dark red body under white spots, with two bright white front claws. Weighing up cardinal shrimp vs harlequin shrimp? Check which harlequin a listing means too, because the harlequin shrimp sold in reef stores is a different animal.

Picking a Sulawesi shrimp when color is the reason you’re buying

Choose the kind of color you want first. The banded, white-gloved and red and yellow Sulawesi species don’t look alike across a room. A banded animal reads as pattern. A red animal with white gloves reads as motion, since the claws are what move while it grazes. A red and yellow animal reads as brightness.

There’s a second question behind the first, and it’s the one that costs people money: is the name on the price list a species at all? On our own list, Sulawesi Blue Ghost, Yellow Ghost, Galaxy, Oiran and White Sock are all Caridina dennerli. Ask which species a name refers to before you pay, because plenty of the types of Sulawesi shrimp on a stock list are color lines wearing a trade name.

Why your shrimp may not look like the photo you bought from

Your shrimp may not match the photo because what you see depends on more than the species. It’s a pattern the animal is born with, shown through a shell that depends on the food, against whatever the animal is sitting on. Most of the color in a crustacean shell comes from astaxanthin, which animals take up from what they eat.²

Background is the part keepers underestimate. In a trial on cherry shrimp, pigmentation rose as the background got darker.³ That points the same way every experienced keeper points: dark rock, dark sand substrate, no bright quartz. Pale gravel is lovely for a lot of things. Showing off a red shrimp isn’t one of them.

Settling in matters too. We wouldn’t judge a shrimp’s color on the day it arrives, or on the smallest animals in the bag. The usual rule is to leave a new colony alone for the first couple of weeks, apart from gentle water changes, and look at the color after that. What if a settled colony that used to be dark fades over a few days instead? That’s a different problem, and the checks for Sulawesi shrimp losing color start with the water, not the light.

Choosing on color never changes the water these shrimp need

No brightly colored Sulawesi shrimp is an easy one. Every lake species in the table sits in the same warm, alkaline, mineral poor water. Whichever pattern you picked, holding Sulawesi shrimp care parameters steady is most of the work in this tank.

If your tank can’t hold that steadily, the color question is premature, and a brighter species won’t survive the same mistake a duller one didn’t. When it can, the tank-bred Sulawesi shrimp lines we keep are all sold against those numbers, not a photograph.

What the research says about Sulawesi shrimp color

The color studies behind this guide are on crustaceans in general and on cherry shrimp, not on Sulawesi Caridina. Read them as the mechanism, not a measurement of your tank. The pigment doing most of the work in a crustacean shell is astaxanthin, bound into proteins that can read as red, purple, blue, blue black or yellow. Animals don’t build carotenoids from nothing. They take them up from what they eat.²

The background result comes from an eight week trial on red cherry shrimp, Neocaridina. Pigmentation increased significantly as the background got darker, and shrimp fed astaxanthin were significantly more pigmented than those fed without it.³ That was a controlled test on a different genus, not a Sulawesi species in your living room. Treat it as the direction things move, not a result you’re promised.

What to confirm about a colorful Sulawesi line before you order it

Color is the one thing about a shrimp you can be sold and then not receive, because it depends on the shell, the food and what the animal is standing on. Before you order, get these answers.

• Which species the trade name refers to, in words, not just the line name on the label.
• Whether the shrimp are tank bred, and what water they’re being kept in right now.
• What size and age is shipping, since we wouldn’t judge a line’s color on its smallest animals.
• Whether the photograph shows the actual animals or a representative specimen.
• Don’t buy on a photo taken over black sand if your own tank has pale gravel. You won’t get that shrimp.

Get those five answered and the color you paid for is mostly the color you’ll see. Miss them, and you’ll spend the difference finding out which of the three arguments above you actually cared about.

References

3 Sources

1. Radiation of endemic species flocks in ancient lakes: systematic revision of the freshwater shrimp Caridina from the ancient lakes of Sulawesi, Indonesia, with the description of eight new species, Raffles Bulletin of Zoology 57(2): 343-452, Lee Kong Chian Natural History Museum, 2009.
2. Astaxanthin from Crustaceans and Their Byproducts: A Bioactive Metabolite Candidate for Therapeutic Application, Marine Drugs 20(3): 206, MDPI, 2022.
3. Effect of Dietary Astaxanthin and Background Color on Pigmentation and Growth of Red Cherry Shrimp, Neocaridina heteropoda, Journal of Fisheries and Environment 38(1): 1-7, Kasetsart University, 2014.