Looking to buy Opae Ula shrimp online? This listing includes 5 live Opae Ula shrimp (Halocaridina rubra), the remarkable Hawaiian red shrimp native to Hawaiʻi's unique anchialine pool ecosystems.
These tiny brackish-water shrimp are known for their brilliant red coloration, exceptional hardiness, peaceful behavior, and extraordinarily long lifespan. Opae Ula are ideal for established shrimp colonies, nano brackish-water aquariums, classroom ecosystems, and DIY self-sustaining shrimp ecospheres.
Whether you're starting an Opae Ula colony or adding shrimp to an established habitat, this 5-pack is an easy and affordable way to bring these fascinating Hawaiian shrimp into your home.
🦐 What You'll Receive
- 5 live Opae Ula shrimp
- Scientific name: Halocaridina rubra
- Common names: Opae Ula, ʻŌpae ʻUla, Hawaiian Red Shrimp, Hawaiian Volcano Shrimp
- Adult size: approximately ½ inch
- Water type: Brackish water
- Peaceful colony species
- Extremely low-maintenance
- Natural algae and biofilm grazers
- Suitable for established Opae Ula tanks and DIY ecospheres
Please note: This listing is for live shrimp only. Aquarium, container, substrate, algae, rocks, decorations, and other accessories are not included unless specifically stated.
🌺 What Are Opae Ula Shrimp?
Opae Ula (Halocaridina rubra) are tiny brackish-water shrimp native to the Hawaiian Islands.
The Hawaiian name Opae Ula is commonly translated as “red shrimp”, referring to the beautiful red coloration frequently displayed by healthy adults.
Unlike traditional freshwater aquarium shrimp, Opae Ula naturally inhabit anchialine pools—rare coastal pools formed within Hawaiʻi's porous volcanic landscape. Fresh groundwater mixes underground with seawater, creating the unusual brackish-water conditions these shrimp have adapted to over generations.
Their ability to survive in these specialized environments helps make Opae Ula remarkably resilient aquarium inhabitants.
Want to learn more about their unusual biology?
Learn about the science behind Opae Ula and self-sustaining ecosystems
.
🌋 Hawaiian Shrimp Shaped by a Volcanic Environment
Opae Ula aren't simply another ornamental aquarium shrimp. Their story is closely connected to the volcanic geology of the Hawaiian Islands.
Rainwater travels through porous volcanic rock while seawater enters underground from the ocean. Where these waters interact, they create anchialine habitats with naturally changing salinity and environmental conditions.
Opae Ula evolved to tolerate these unusual environments. Their slow metabolism, tiny adult size, and ability to continuously graze on naturally occurring microorganisms make them particularly well suited to stable, low-maintenance ecosystems.
⭐ Why Keep Opae Ula?
Extremely Low-Maintenance Shrimp
Once an Opae Ula aquarium is properly established, these shrimp require surprisingly little maintenance compared with many other aquarium animals.
Rather than depending on frequent feeding, they spend much of their day grazing on naturally occurring algae, microorganisms, and biofilm.
New to keeping Opae Ula?
Read our complete Opae Ula Care Guide
before setting up your shrimp habitat.
Extraordinary Lifespan
For such a tiny animal, Opae Ula can be exceptionally long-lived. Under appropriate conditions, lifespans of 10 to 20+ years have been reported.
This makes keeping Opae Ula very different from keeping many other small aquarium shrimp. The five tiny shrimp you purchase today could potentially remain part of your ecosystem for many years.
Perfect for Small Aquariums
Adult Opae Ula grow to only around ½ inch in length, making them excellent inhabitants for appropriately established nano brackish-water aquariums, desktop ecosystems, and small shrimp displays.
Peaceful Colony Animals
Opae Ula can live peacefully together in colonies. You'll often see them:
- Grazing across lava rock
- Picking algae from aquarium glass
- Exploring substrate
- Swimming through the water column
- Hiding among rocks and decorations
- Interacting peacefully with other Opae Ula
🍃 What Do Opae Ula Eat?
Opae Ula are natural grazers. Rather than waiting for large meals, they spend much of their time picking microscopic food from submerged surfaces.
Their natural diet can include:
- Microalgae
- Biofilm
- Diatoms
- Bacteria
- Microscopic organic material
In a mature aquarium with sufficient natural algae and biofilm, Opae Ula require very little supplemental feeding.
Overfeeding can be more harmful than underfeeding. Excess food can break down, reduce water quality, and interfere with the biological balance of a small ecosystem.
For more detailed feeding and maintenance information, visit our
Opae Ula shrimp care instructions
.
💧 Opae Ula Water & Care Requirements
Opae Ula are hardy, but it is important to remember that they are brackish-water shrimp, not traditional freshwater shrimp.
-
Specific Gravity: Approximately 1.010–1.014
-
Temperature: Approximately 68–80°F
-
Lighting: Bright indirect light or gentle artificial lighting
-
Water: Properly prepared brackish water
-
Diet: Primarily naturally occurring algae and biofilm
Avoid placing an Opae Ula aquarium in direct sunlight. Small containers can heat rapidly, and excessive light may also create unwanted algae growth.
When water evaporates, the salt remains behind. Top off evaporation with distilled or RO water rather than adding additional saltwater.
Before your shrimp arrive, we recommend reading our
complete Opae Ula Care Guide
.
🥚 Can Opae Ula Reproduce in Captivity?
Yes. One of the most exciting parts of maintaining an established Opae Ula colony is eventually seeing the shrimp reproduce.
Mature females may become “berried”, meaning they carry developing eggs beneath their abdomen.
Opae Ula also have an interesting reproductive cycle because their offspring do not immediately hatch as miniature versions of adult shrimp.
After hatching, the offspring begin as free-swimming larvae. These tiny larvae can often be seen suspended or gently swimming through the water before eventually developing into juvenile shrimp.
With patience and a healthy environment, a small starter colony can potentially develop into a larger Opae Ula population over time.
🎨 Why Is My Opae Ula Not Bright Red?
Don't worry if every shrimp isn't bright red when it arrives.
Despite the name Hawaiian Red Shrimp, individual Opae Ula may appear:
- Deep crimson
- Bright red
- Orange-red
- Pink
- Pale
- Nearly transparent
Coloration can change depending on lighting, surroundings, activity, stress, environmental conditions, and recent molting. A shrimp temporarily becoming pale does not necessarily mean something is wrong.
🔬 A Living Miniature Ecosystem
Opae Ula are fascinating animals for children, classrooms, teachers, science enthusiasts, aquarium hobbyists, and anyone interested in ecology.
A properly balanced shrimp ecosystem provides an opportunity to observe biological processes such as:
Light → Algae Growth → Shrimp Grazing → Waste → Bacteria → Nutrients → New Algae Growth
This natural recycling process is one reason Opae Ula can thrive in extremely low-maintenance environments.
Explore this process in more detail on our
Science of Self-Sustaining Shrimp Ecosystems
page.
Over time, you may observe:
- Grazing behavior
- Molting
- Color changes
- Algae growth
- Biofilm development
- Berried females
- Free-swimming larvae
- Juvenile shrimp
- Colony growth
🫙 Want to Build Your Own Opae Ula Ecosphere?
These 5 live Opae Ula shrimp can be an excellent starting point for a properly prepared DIY shrimp ecosystem.
Before adding your shrimp, the habitat should contain correctly prepared brackish water and have enough time to develop beneficial bacteria, algae, and biofilm.
Learn how to build and maintain your own Opae Ula ecosystem
.
If you would rather purchase a complete ecosystem instead of building your own, check out our
complete Opae Ula Shrimp Ecosphere
.
🏠 Great for Many Types of Opae Ula Keepers
These 5 live Opae Ula shrimp for sale are a great choice for:
- Starting an Opae Ula colony
- Adding shrimp to an existing Opae Ula colony
- Brackish-water nano aquariums
- DIY Opae Ula ecospheres
- Desktop shrimp aquariums
- Classroom ecosystems
- Science projects
- Hawaiian-themed aquariums
- Low-maintenance aquatic pets
- Beginner Opae Ula keepers
- Experienced shrimp hobbyists
📦 Live Opae Ula Shipped to Your Door
Ordering live shrimp online can feel intimidating, which is why we carefully prepare our Opae Ula for transportation.
Your shrimp are backed by our Live Arrival Guarantee. If there is a problem with your Opae Ula upon arrival, contact us promptly according to our live-arrival policy so we can help.
🌊 Want a Complete Self-Sustaining Opae Ula Ecosystem?
If you're interested in Opae Ula but don't want to build an aquarium yourself, consider one of our complete Shrimp Ecosystems.
Our
Classic Opae Ula Shrimp Ecosphere
combines live Hawaiian shrimp, algae, substrate, and natural aquascaping into a miniature living ecosystem.
Want a larger illuminated display? See our
20 Opae Ula Self-Sustaining Ecosystem with LED Light
.
You can also
browse all Shrimp Ecosphere products
to find an ecosystem for your home, office, classroom, or gift.
🦐 Buy 5 Live Opae Ula Shrimp Online
Opae Ula offer something completely different from ordinary aquarium shrimp.
They're tiny, peaceful, extraordinarily hardy, and uniquely connected to Hawaiʻi's rare anchialine ecosystems. Their fascinating biology, long lifespan, low-maintenance lifestyle, and ability to establish breeding colonies make them one of the most interesting shrimp species available to aquarium enthusiasts.
Order 5 live Opae Ula shrimp (Halocaridina rubra) from Shrimp Ecosphere today and start—or expand—your Hawaiian red shrimp colony.
Frequently Asked Questions About Opae Ula
Where can I buy Opae Ula shrimp online?
You can buy live Opae Ula shrimp online from Shrimp Ecosphere. This listing includes five live Halocaridina rubra for customers looking to start or expand an established Opae Ula colony.
Are Opae Ula freshwater shrimp?
No. Opae Ula are brackish-water shrimp and should be kept in properly prepared brackish water rather than a traditional freshwater shrimp aquarium.
Are Opae Ula easy to care for?
Yes. Once their habitat is properly established, Opae Ula are exceptionally low-maintenance. They primarily graze on naturally occurring algae, microorganisms, and biofilm.
See our
complete Opae Ula Care Guide
for setup and maintenance instructions.
How big do Opae Ula get?
Adult Opae Ula typically reach approximately ½ inch in length.
How long do Opae Ula shrimp live?
Opae Ula are exceptionally long-lived shrimp. Under suitable conditions, lifespans of 10 to 20+ years have been reported.
Do Opae Ula need a filter?
Opae Ula can thrive in properly established ecosystems without the powerful filtration typically associated with traditional aquariums. Biological stability, appropriate brackish water, and established algae and biofilm are particularly important.
Do Opae Ula need a heater?
Usually not if they are maintained at an appropriate and stable room temperature.
What do Opae Ula eat?
Opae Ula naturally graze on algae, biofilm, diatoms, bacteria, and microscopic organic material growing throughout their habitat.
Can Opae Ula reproduce in captivity?
Yes. Opae Ula can reproduce in an established brackish-water aquarium. Females carry eggs beneath their abdomen, and the offspring pass through a free-swimming larval stage before developing into juvenile shrimp.
Can I add these five Opae Ula to my existing colony?
Yes, provided your existing aquarium is established and has appropriate brackish-water conditions for Halocaridina rubra.
Can I make my own Opae Ula ecosphere?
Yes. You'll need to properly prepare and establish the habitat before introducing the shrimp.
Read our
DIY Opae Ula Ecosphere Guide
to learn more.
