Artemia Brine Shrimp: Hatch, Feed & Maximize Nutrition

Artemia — commonly called brine shrimp — are the most popular live food in the aquarium hobby. They're nutritious, easy to hatch at home, and accepted by almost every fish species.

Quick Answer: Artemia are tiny crustaceans hatched from dormant eggs (cysts) in saltwater. Use 25–28°C water, 25 ppt salinity, and strong aeration for 24–48 hours. Feed freshly hatched nauplii within 12 hours for maximum nutrition — after that, their value drops fast.

What Is Artemia and Why Aquarists Love It

Artemia is a genus of small saltwater crustaceans used worldwide as live fish food. Freshly hatched larvae (called nauplii) contain up to 60% protein by dry weight [1]. Their natural movement triggers the hunting instinct in fish — even picky eaters respond.

Artemia eggs (called cysts) stay dormant for decades when stored properly. That makes them far more convenient than culturing other live foods.

Why Artemia Works So Well

• Nauplii size at hatch: 0.2–0.5 mm — ideal for most fry
• Protein content: up to 60% dry weight
• Natural movement triggers feeding in reluctant fish
• Eggs store for months without refrigeration when sealed
• Works for almost every freshwater species from guppies to discus

Artemia vs. Other Live Foods

Recommendation: Use artemia nauplii for fry and juveniles. For larger fish, use adult brine shrimp — live or frozen. See our complete guide to live foods for freshwater fish for more options.

Choosing the Right Artemia Eggs

Not all artemia cysts are equal. Hatch rate and nauplii size vary by grade and strain.

Grade A eggs (≥90% hatch rate) are worth the extra cost when raising fry. Grade B eggs work fine for adult fish. Always check the expiry date — old eggs hatch poorly even when stored correctly.

The San Francisco Bay Brand Artemia Eggs consistently deliver 85–90% hatch rates. They're a reliable choice for home hatching.

Egg Grades at a Glance

Decapsulated eggs have the outer shell removed. You don't need to separate shells from nauplii after hatching. They cost more but save time when raising sensitive fry.

How to Hatch Artemia Eggs Step by Step

Hatching artemia is straightforward. Most beginners get it right on the first try. You need a few common supplies and the right water conditions.

A 1–2 liter plastic bottle makes an excellent hatchery. The single most important factor is strong, constant aeration that keeps every egg tumbling.

Pro Tip: Use an inverted cone-shaped bottle (a cut 2L soda bottle works). The cone keeps eggs moving continuously. Flat-bottomed containers let eggs settle and die — avoid them.

A dedicated brine shrimp hatchery kit takes the guesswork out of the process. Most kits include a cone vessel, air pump, and a tap for easy harvesting.

Step-by-Step Hatching Instructions

1. Mix dechlorinated water with non-iodized sea salt to 25 ppt (25g per liter)
2. Add artemia cysts — roughly 1 teaspoon per liter of water
3. Set water temperature to 25–28°C (77–82°F)
4. Run strong aeration — every egg must stay in motion
5. Place a small lamp nearby to attract nauplii once hatched
6. Wait 24–48 hours
7. Turn off the air pump and wait 5–10 minutes for separation
8. Harvest the orange nauplii from the bottom using a brine shrimp net

What to Watch For During Hatching

Unhatched shells float to the surface. Live nauplii are orange and swim toward light. Harvest only the nauplii — shells can block the digestive tracts of fry and cause problems [2].

Always rinse harvested nauplii through a fine mesh net (120–180 micron) under fresh dechlorinated water before adding them to your tank. This removes excess salt.

Nutritional Value: What the Science Shows

Freshly hatched artemia nauplii are most nutritious. Their value drops significantly after 12 hours.

The nauplii carry a yolk sac loaded with omega-3 fatty acids and essential amino acids. Once they start feeding on their own, they burn through that yolk sac fast. After 12–24 hours, nauplii can lose up to 40% of their omega-3 content [3]. Feed them fresh — every hour matters.

Nutritional Stages of Artemia

According to NOAA Fisheries scientific publications, omega-3 fatty acids from artemia nauplii are critical for larval fish brain and eye development. Feeding late-stage nauplii cuts these benefits significantly.

Common Myth: "Brine shrimp are a complete diet." Reality: Artemia nauplii are low in vitamins C and B12. They're excellent as a supplement, but don't rely on them as the only food source. Rotate with other foods for balanced nutrition.

Gut-Loading: Boost Nutritional Value Before Feeding

Gut-loading means feeding artemia before you feed them to your fish. It dramatically increases what your fish actually get from each nauplius.

Adult brine shrimp eat almost anything. Use spirulina powder or concentrated microalgae. Feed them for 12–24 hours, then offer them to your fish right away.

Best Gut-Loading Foods

• Spirulina powder (most common, highly effective)
• Concentrated phytoplankton
• Commercial enrichment products like Selcon or Dan's Feed

This technique is especially useful for demanding fish like discus.

Want to raise healthy fry from day one? Our freshwater fish fry care guide covers feeding schedules and survival tips for every growth stage.

Staggered Hatching: Always Have Fresh Nauplii Ready

Don't hatch one batch and wait for it to run out. Set up multiple batches 12–24 hours apart instead.

This "staggered hatching" approach means you always have freshly hatched nauplii on hand. Start a new batch every day or two. It takes about 2 minutes to set up.

Simple Staggered Schedule

Use small 500ml bottles for each batch. Label them with the start date so you don't mix up fresh and old batches.

Common Mistakes to Avoid

1. Water Temperature Too Low

Below 22°C, hatch rates drop sharply. Below 18°C, most eggs won't hatch at all. Keep the temperature stable at 25–28°C. A small aquarium heater works well for this.

2. Not Enough Aeration

This is the most common mistake. If any eggs settle to the bottom, they die. The airflow must keep every single egg tumbling continuously — no exceptions.

3. Feeding Too Late

Many hobbyists harvest nauplii and store them in the fridge. This kills them within hours. Feed nauplii within 12 hours of hatching. Don't store them — hatch only what you need.

4. Skipping the Rinse

Salt water from the hatchery raises tank salinity if added directly. Always rinse nauplii through a fine mesh net with fresh dechlorinated water first.

5. Using Iodized Salt

Iodine is toxic to artemia. Use non-iodized sea salt or aquarium salt only. Regular table salt will kill your nauplii.

Using Frozen Brine Shrimp

Frozen brine shrimp are a convenient alternative to live nauplii. They're ideal for adult fish and as a backup when a hatch fails.

The Ocean Nutrition Brine Shrimp Plus is enriched with omega-3 fatty acids and spirulina. It's one of the best frozen options available and widely trusted by aquarists.

Frozen nauplii are less stimulating than live ones, but far more nutritious than dried flake food. Use them 2–3 times per week as part of a varied diet.

Live vs. Frozen: Quick Comparison

Storing Artemia Eggs Properly

Proper storage keeps hatch rates high for years. Keep cysts in an airtight container in the refrigerator or freezer. Oxygen and humidity are the main enemies.

Once you open a can, transfer leftover eggs to a resealable bag with the air squeezed out. Don't store opened eggs at room temperature — hatch rates drop noticeably within weeks. In a sealed container in the freezer, eggs can last 5+ years with minimal quality loss.

Key Numbers to Remember

• Water salinity: 25 ppt
• Hatching temperature: 25–28°C
• Hatch time: 24–48 hours
• Feed within: 12 hours of hatching
• Rinse before feeding: always
• Salt type: non-iodized sea salt only

Ready to get started? Shop artemia eggs and hatchery kits on Amazon and hatch your first batch today.