Fry survival and growth rate depend almost entirely on food quality during the first critical weeks of life. Newborn livebearer fry have tiny mouths, fast metabolisms, and zero fat reserves — if they cannot find appropriate food within hours of birth, growth stalls and mortality increases.
The best approach combines a high-quality powdered fry food for immediate feeding with live baby brine shrimp for maximum growth once fry are a few days old. This guide covers the best options at every stage.
Quick Picks
- Best Overall: Hikari First Bites — ultra-fine powder suitable from birth, 48% protein
- Best High Protein: Xtreme Nano — 52% protein, krill-based, all-natural formula
- Best Live Food: SF Bay Brand Brine Shrimp Hatch Mix — the gold standard, 90%+ hatch rate
- Best Transition Food: Fluval Bug Bites — crush for older fry, serves as adult food too
Detailed Reviews
1. Hikari First Bites
Hikari First Bites
Best Overall- ✓ Ultra-fine particles suitable for newborn fry
- ✓ 48% protein supports rapid early growth
- ✓ Semi-floating keeps food in the water column where fry feed
- ✓ Widely available and affordable
- ✗ Can cloud water if overfed
- ✗ Small container runs out quickly with large batches
Hikari First Bites is the default recommendation for livebearer fry, and it has earned that position through consistency. The ultra-fine powder is small enough for day-one guppy and platy fry to eat — no crushing or preparation needed.
At 48% protein, the nutritional profile supports the rapid growth rate that fry need during their first weeks. The semi-floating particles distribute throughout the water column, which is important because newborn fry feed wherever they happen to be — not just at the surface.
The container is small (0.35 oz), but you use tiny amounts per feeding. A pinch between your fingers is enough for 20-30 fry. Feed 4-5 times daily in these tiny amounts rather than one large feeding — fry have small stomachs and need frequent meals.
Best for: Day-one through two-week-old livebearer fry.
2. Xtreme Aquatic Foods Nano
Xtreme Aquatic Foods Nano
Best High Protein- ✓ 52% protein with krill as first ingredient
- ✓ All-natural ingredients, made in USA
- ✓ No hormones or artificial colors
- ✓ Works for fry and small adult fish
- ✗ Pellet format not ideal for newborn fry — crush for very young
- ✗ 9 oz runs out faster than larger containers
Xtreme takes the protein content higher — 52% from a krill-based formula. The extra protein drives faster growth rates in fry, which matters if you are growing out batches for sale or selective breeding. All ingredients are natural with no hormones or artificial colors.
The 0.5mm slow-sinking pellet size works well for fry that are a week or more old. For the very first days of life, crush the pellets between your fingers for a finer powder, or use Hikari First Bites for day-one fry.
The 9 oz container provides good value for hobbyist breeders. Feed small amounts 3-4 times daily for best results.
Best for: Fry 1+ week old and small community fish that need high-protein, all-natural food.
3. San Francisco Bay Brand Brine Shrimp Hatch Mix
San Francisco Bay Brand Brine Shrimp Hatch Mix (3-Pack)
Best Live Food- ✓ Baby brine shrimp is the gold standard fry food
- ✓ High hatch rate ensures consistent supply
- ✓ Newly hatched nauplii are nutritionally complete
- ✓ Triggers strong feeding response in all fry species
- ✗ Requires hatching setup (24-48 hours advance planning)
- ✗ Saltwater hatching adds complexity
Nothing makes fry grow faster than live baby brine shrimp. Newly hatched brine shrimp nauplii are the perfect size for livebearer fry (from day 1 for molly fry, day 2-3 for guppy fry), nutritionally complete, and trigger an instinctive feeding response that no prepared food matches.
The SF Bay Brand eggs have consistently high hatch rates (90%+), which means less waste and more food per hatch cycle. Set up a simple hatchery (a 2-liter bottle, saltwater, air pump, and light), add eggs, and harvest nauplii 24-36 hours later.
The effort is the downside. You need to plan 24-48 hours ahead, maintain a hatching setup, and harvest regularly. For hobbyists producing fry occasionally, it may not be worth the hassle. For serious breeders growing out show-quality fish, the growth difference is dramatic.
Best for: Serious breeders who want maximum fry growth rates.
4. Fluval Bug Bites (Crushed)
Fluval Bug Bites Tropical Granules
Best Transition Food- ✓ Crushed granules work well for older fry (2+ weeks)
- ✓ Black soldier fly larvae protein promotes growth
- ✓ Easy to crush between fingers to desired size
- ✓ Doubles as adult food — one container serves both
- ✗ Not fine enough for newborn fry without crushing
- ✗ Requires manual crushing — not a dedicated fry food
Fluval Bug Bites is not a dedicated fry food, but it works excellently as a transition food once fry are 2-3 weeks old and ready for larger particles. Crush the granules between your fingers to the appropriate size — a quick rub produces particles ranging from powder to small crumbles.
The advantage is versatility. You buy one container that feeds adults and (when crushed) feeds growing fry. No separate fry food purchase needed once the fry are past the ultra-fine stage.
At 45% protein from black soldier fly larvae, the nutritional profile supports continued growth during the juvenile phase. Use this as fry outgrow First Bites or Nano but before they can handle full-sized adult pellets.
Best for: Fry older than 2 weeks transitioning to larger food sizes.
Comparison Table
| Hikari First Bites Best Overall | Xtreme Aquatic Foods Nano Best High Protein | San Francisco Bay Brand Brine Shrimp Hatch Mix (3-Pack) Best Live Food | Fluval Bug Bites Tropical Granules Best Transition Food | |
|---|---|---|---|---|
| Rating | 9/10 | 8.8/10 | 9.2/10 | 8.4/10 |
| Price | $4-$7 | $8-$12 | $15-$22 | $5-$8 |
| Type | Semi-floating micro powder | Slow-sinking micro pellet | Pre-salted brine shrimp hatch mix pouches | Slow-sinking granule |
| Protein | 48% | 52% | — | 45% |
| Size | 0.35 oz (10g) | 9 oz | 3-pack (pouches) | 1.6 oz (45g) |
| Particle Size | Ultra-fine — suitable from birth | 0.5mm — suitable for fry 1+ week | — | — |
| Hatch Rate | — | — | 90%+ | — |
| Use | — | — | Add water to pouch, hatch, feed nauplii to fry | Crushed for fry 2+ weeks old |
Fry Food Buying Guide
Feeding Timeline
| Age | Food Type | Frequency |
|---|---|---|
| Day 0-3 | Ultra-fine powder (First Bites), vinegar eels, infusoria | 5-6x daily |
| Day 3-14 | Powder food + baby brine shrimp | 4-5x daily |
| Week 2-4 | Crushed pellets + baby brine shrimp | 3-4x daily |
| Week 4+ | Crushed adult food, transition to full-size pellets | 3x daily |
Live Food Options for Fry
- Baby brine shrimp: Best live food for fry after day 2-3. Requires hatching setup.
- Vinegar eels: Tiny nematodes perfect for day-one fry. Self-sustaining culture.
- Microworms: Slightly larger than vinegar eels. Easy to culture on oatmeal.
- Infusoria: Microscopic organisms for the smallest fry. Culture in green water.
- Daphnia: Larger live food for juvenile fish 3+ weeks old.
Water Quality with Fry Food
Fry food — especially powdered foods — fouls water faster than adult food. Mitigation strategies:
- Feed tiny amounts frequently rather than large amounts infrequently
- Remove uneaten food after 30 minutes with a turkey baster
- Increase water changes to 2-3 times weekly in fry tanks
- Run a sponge filter for biological filtration without risking fry safety
Frequently Asked Questions
What can I feed newborn guppy fry?
Day-one guppy fry can eat Hikari First Bites powder, vinegar eels, or infusoria. By day 3-4, they can handle baby brine shrimp and larger powdered foods. Feed 5-6 times daily in tiny amounts.
How often should I feed fry?
4-6 times daily for fry under 2 weeks old. Their small stomachs cannot hold much, and their fast metabolism demands frequent nutrition. Reduce to 3-4 times daily after 2 weeks, and 2-3 times daily by 4 weeks.
Do I have to feed live food?
No. Quality powdered fry foods like Hikari First Bites and Xtreme Nano can produce healthy fry without live food. However, fry fed live baby brine shrimp typically grow 30-50% faster than those fed prepared food alone. If maximum growth is the goal, live food makes a noticeable difference.
Can fry eat regular fish food?
Not newborn fry — the particles are too large. Once fry are 2-3 weeks old, you can crush regular pellets or flakes into a fine powder. By 4-6 weeks, many fry can eat small pellets whole.
How long until fry can eat adult food?
Most livebearer fry transition to regular adult food by 4-6 weeks old. Guppy fry are typically large enough for micro pellets by week 4. Molly fry, being born larger, can sometimes handle small crushed pellets from week 2.
Conclusion
For most hobbyists raising livebearer fry, Hikari First Bites plus crushed Fluval Bug Bites covers the entire growth period from birth to adulthood. If you want to maximize growth rates, add live baby brine shrimp starting at day 3 — the growth difference is significant and visible within a week.
Serious breeders should invest in Xtreme Nano for its higher protein content and bulk packaging, and establish a brine shrimp hatching routine. The combination of powdered food for convenience and live food for growth produces the healthiest, fastest-growing fry.