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title: "Baby Brine Shrimp (Artemia): The Complete Hatching & Feeding Guide" description: "Master baby brine shrimp: hatching Artemia nauplii, salinity and temperature, decapsulation, harvesting, enrichment, and feeding BBS as the ultimate fry food." slug: baby-brine-shrimp commonName: Baby Brine Shrimp (BBS) scientificName: Artemia salina family: Artemiidae order: Anostraca difficulty: Beginner minTankSize: 1 temperature: "25–28°C (77–82°F)" ph: "7.5–8.5" hardness: "Marine salinity" lifespan: "Fed within 12–24h of hatch" maxSize: "0.5 mm at hatch" origin: "Hypersaline lakes worldwide" publishedAt: "2026-06-04"

Baby Brine Shrimp (Artemia): The Complete Hatching & Feeding Guide

Ask any successful breeder what single tool made the difference between losing spawns and raising them, and the answer is almost always the same: baby brine shrimp. Freshly hatched Artemia nauplii are the closest thing the hobby has to a universal fry food — nutritious, irresistibly wriggling, and hatched on demand from a jar of dry cysts that store for years. The bright orange swarm triggers a feeding response in fry that ignore everything else, and because brine shrimp are a saltwater animal, any that go uneaten simply die off in freshwater rather than establishing as pests.

This guide covers the whole process: what brine shrimp are, how to set up a hatchery, the exact conditions for a high hatch rate, how to harvest and (optionally) enrich the nauplii, and how to feed them for maximum fry growth.

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What Are Brine Shrimp?

Brine shrimp are Artemia, small crustaceans that live in hypersaline lakes and salt pans — environments so salty that almost nothing else survives, which means no predators. To cope with their harsh, unpredictable habitat, Artemia evolved a remarkable trick: when conditions deteriorate, females produce diapause cysts — embryos in suspended animation, encased in a tough shell, that can be dried and stored for years and then hatch within a day when returned to saltwater.

That biological quirk is the foundation of modern fish breeding. A tin of Artemia cysts is, in effect, a shelf-stable supply of live food waiting to be activated. Add the cysts to warm saltwater with light and aeration, and 18–36 hours later you have thousands of swimming nauplii — newly hatched brine shrimp, each still carrying an orange yolk sac that makes it both visible and nutritious.

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Why Baby Brine Shrimp Are the Gold Standard

• They trigger feeding. The jerky swimming of live nauplii provokes a hunting strike even in fry that refuse prepared foods. Their bright orange colour makes them easy for fry to see and target.
• They are highly nutritious. Freshly hatched nauplii are rich in protein and the yolk-derived fats that fuel rapid fry growth — more so than microworms or infusoria.
• They are available on demand. Hatch a batch whenever you need one; no live culture to maintain between spawns.
• They self-clean the tank. Because Artemia is a saltwater animal, uneaten nauplii die in freshwater within hours rather than fouling the tank or competing with fry — there is no pest risk.
• They suit a huge range of fish. From betta and tetra fry to adult nano fish and conditioning food for larger species, BBS is one of the most universally useful live foods there is.

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Hatchery Parameters

A high hatch rate comes down to getting a handful of conditions right. The numbers below are the difference between a 90% hatch and a disappointing trickle.

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Setting Up a Hatchery

The classic hatchery is an inverted plastic bottle or a purpose-made cone, chosen because the conical shape keeps cysts swirling rather than settling in dead corners.

1. Vessel. Cut the bottom off a 1–2 litre plastic bottle and mount it inverted (neck down) in a stand, or use a dedicated hatchery cone. The narrow base lets you drain harvested nauplii from the bottom.
2. Saltwater. Fill with dechlorinated water and add non-iodised salt to 25–35 ppt. A pinch of baking soda buffers the pH up for a better hatch.
3. Aeration. Run a rigid airline to the very bottom so the whole volume rolls vigorously — no still spots. This is the most-overlooked factor in a poor hatch.
4. Cysts. Add roughly ¼–½ teaspoon of cysts per litre. More is not better; overcrowding lowers oxygen and hatch rate.
5. Heat and light. Keep the hatchery at 25–28°C and lit. A small lamp provides both.
6. Wait 18–36 hours. You will see the water fill with a faint orange cloud as the nauplii hatch.

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Decapsulation (Optional but Worthwhile)

The cyst shell is indigestible, and empty shells must be separated from nauplii before feeding (eaten shells can cause problems in fry). Many breeders skip this hassle by decapsulating cysts — dissolving the outer shell with bleach before hatching.

The short version: hydrate the cysts in fresh water for an hour, then stir them into a cold bleach solution (unscented household bleach) for a few minutes until they turn from brown to orange, watching constantly. Rinse thoroughly under running water until all bleach smell is gone, and neutralise with a dechlorinator. Decapsulated cysts hatch with no shell to separate — and the shell-free cysts can even be fed directly to fry without hatching at all, as a nutritious food in their own right.

Decapsulation takes practice and care (it is a timed bleach reaction), so beginners often start with plain cysts and a good harvest technique, then graduate to decapsulation once comfortable.

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Harvesting Baby Brine Shrimp

Timing and separation are everything.

Turn off the air and let it settle. Once hatching is complete, switch off the aeration and let the hatchery sit for 5–10 minutes. Three layers form: empty shells float to the top, unhatched cysts sink to the bottom, and the orange nauplii — drawn to light — gather in the middle, usually toward the lit side.

Use light to concentrate them. Shine a light at the base of the hatchery; the phototactic nauplii swarm toward it, making them easy to siphon as a dense orange mass while avoiding the shell layer on top.

Siphon from the middle. Draw the concentrated nauplii through airline tubing into a fine brine-shrimp net.

Rinse before feeding. Hold the net under fresh, cool water to rinse off the salt and any stray shells before tipping the nauplii into your freshwater fry tank. This prevents adding salt to your tank and removes indigestible shell fragments.

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Feed Within Hours — Why Freshness Matters

A baby brine shrimp is at its most nutritious in the first 12 hours after hatching, while it still carries its orange yolk sac. As the nauplii swim and consume that yolk, their food value drops — by 24 hours they have used much of their energy reserve and are noticeably less nutritious. The practical rule: feed BBS as soon after hatching as you can, and harvest the whole batch within 24 hours.

This is why breeders run a rolling hatchery — starting a new batch every day or two so there is always a supply of freshly hatched, yolk-rich nauplii. Some keepers run two hatcheries on alternating days for a continuous supply.

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Enriching Baby Brine Shrimp

For fry that stay on brine shrimp for an extended grow-out, or for marine work, nauplii can be enriched — kept alive for a further 12–24 hours and fed a HUFA (highly unsaturated fatty acid) booster, green water, or a commercial enrichment so they pack those nutrients into their gut before being fed out. Enriched, slightly older brine shrimp deliver fatty acids that newly hatched nauplii lack — valuable for species with high developmental needs. For most freshwater fry, freshly hatched unenriched nauplii are perfectly sufficient.

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Feeding BBS to Fish

Baby brine shrimp suit an enormous range of fish:

• Fry of almost every species large enough to take them — bettas (after a few days on smaller foods), tetras, barbs, livebearers, corydoras, cichlids, and many more.
• Adult nano fish — chili rasboras, pygmy corydoras, small killifish — for whom BBS is a staple-sized live food.
• Conditioning food for breeders — a few days of brine shrimp brings many species into spawning condition.

Fry visibly "pink up" after feeding as their transparent bellies fill with orange nauplii — a satisfying at-a-glance confirmation that they are eating. Feed two to three small batches a day for fast, even fry growth, and remove uneaten nauplii if they accumulate (though in freshwater they die off quickly on their own).

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Troubleshooting

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Interesting Facts

• Artemia can survive in water saltier than the Dead Sea. Their tolerance of extreme salinity is what gives them predator-free habitats — and what makes uneaten nauplii harmless in your freshwater tank.
• The cysts are true cryptobiosis. A dried Artemia cyst has almost no measurable metabolism and can survive years of storage, extreme cold, and even brief vacuum — then revive within hours.
• "Sea-Monkeys" are brine shrimp. The novelty pets sold for decades are simply Artemia, hatched from cysts exactly as breeders do.
• They were a space experiment. Artemia cysts have been flown on spaceflights to study how radiation affects dormant life.

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Bringing It Together

Baby brine shrimp is the food that makes serious breeding possible. A jar of cysts on the shelf becomes thousands of nutritious, feeding-triggering nauplii within a day — no live culture to nurse between spawns, no pest risk, and no fry that refuse to eat. Get the basics right — non-iodised salt at the correct salinity, warmth, strong aeration, light, and harvesting while the nauplii are still yolk-rich — and you have the single most powerful fry-rearing tool in the hobby. Pair it with microworms for the earliest feeds and Daphnia as fry grow, and you can raise virtually any spawn from hatch to juvenile.