Live Copepods

What Are Live Copepods?

 

Copepods are small marine crustaceans ranging from roughly 50 micrometers to several millimeters across multiple life stages — nauplius, copepodite, and adult — creating a continuous natural food source suitable for many sizes of marine fish and invertebrate. With over 24,000 described species globally, copepods as a group are among the most abundant multicellular organisms in the ocean and a primary natural prey source for countless marine species. Across the group, copepods occupy every microhabitat — crawling on surfaces, swimming in open water, and drifting near the surface — which is why a well-established copepod population can help create a more complete food web within an aquarium.

 

Our production strain is Tigriopus thailandensis (Chullasorn, Ivanenko, Dahms, Kangtia & Yang, 2012), a native Thai harpacticoid copepod originating from coastal Gulf of Thailand waters. This species was also separately described and published under the name Tigriopus sirindhornae (Chullasorn, Dahms & Klangsin, 2013); WoRMS currently treats sirindhornae as a junior subjective synonym of thailandensis, meaning both names refer to the same accepted taxon. In continuous cultivation since 2013 at the Pathiu Marine Biomass Facility in Chumphon, this strain offers exceptional hardiness, reproductive performance, and nutritional value specifically suited to tropical reef systems.

 

Why Choose Lion Pods™ Live Copepods?

 

Natural Nutritional Composition

 

Copepods as a group are recognized in aquaculture nutrition literature for their high protein content, meaningful lipid fraction, and a broad natural fatty-acid profile — including EPA, carotenoid pigments such as astaxanthin, marine phospholipids, and free amino acids. These are genus- and family-level characteristics documented across harpacticoid copepods broadly; a full species-specific fatty-acid and biochemical assay unique to Tigriopus thailandensis, produced under our specific cultivation conditions, is part of our ongoing evidence program and will be published here once available.

 

Unlike Artemia and rotifers, which are typically enriched artificially before use — a process whose nutritional benefit is understood to degrade relatively quickly after hatching — copepods are widely documented in aquaculture literature as carrying a naturally complete nutritional profile without requiring an enrichment step. This complete nutritional spectrum supports growth, survival, coloration, and immune function in ways that a single-ingredient alternative cannot fully replicate.

 

Verified Survival & Growth Performance — Study-Specific Evidence

 

Peer-reviewed research on Coral Grouper (Plectropomus leopardus) larviculture reported meaningfully higher survival in systems supplemented with copepods compared to standard diet controls, and separate controlled trials reported copepod-fed larvae achieving greater length and width at 21 days compared to larvae raised on rotifers alone (Tangsitthiwat, Hemwech & Koolkalya, 2025; Burgess et al., 2019). These are documented results from specific trials conducted with a specific fish species under specific culture conditions — they demonstrate that copepod supplementation can produce a substantial measurable improvement in larviculture outcomes under study conditions, but should not be read as a guaranteed percentage improvement applicable to every fish species or hatchery system.

 

The Mouth-Gape Solution

 

First-feeding marine fish larvae and small-mouthed ornamental species have extremely small mouth openings — in some documented cases under 100 micrometers — which can be too small for standard rotifers or newly hatched Artemia to be consumed effectively, since both are physically larger than this feeding window in many cases. Copepod nauplii are among the few live feeds naturally sized to fit this narrow window, which is a significant part of why they are increasingly used for raising mandarinfish, seahorses, pipefish, and other small-mouthed ornamental species that are difficult to rear on standard live feeds alone.

 

Natural Movement & Feeding Response

 

The natural movement of copepods — crawling, darting, or jerky swimming — is widely reported to trigger the instinctive hunting behavior of selective feeders in a way that prepared, frozen, or non-moving foods do not replicate. This is considered an important factor for species like mandarinfish and seahorses, which in the wild feed largely on small moving prey. Copepods also naturally synthesize carotenoid pigments, including astaxanthin, which can accumulate in fish tissue and contribute to more vibrant natural coloration over time — a biological process distinct from, and generally more gradual than, artificial color-enhancing feed additives.

 

Dual Benefit: Food and Biological Maintenance

 

Beyond nutrition, benthic copepods are documented to consume uneaten food, film algae, detritus, and certain nuisance microfauna such as ciliates. Over time, an established copepod population can contribute to processing organic waste before it fully decomposes, which is one factor among several that influence nitrate and phosphate levels in a reef system — though copepods should be understood as one part of an aquarium's biological filtration, not a replacement for standard water-quality management.

 

Species Zonation — Complete Tank Coverage

 

Different copepod species occupy different zones of an aquarium — benthic species crawl across live rock, sand, and crevices, feeding bottom-dwelling fish and invertebrates; pelagic species swim through the water column, supporting mid-water fish including anthias and wrasses; surface-dwelling species move near the water surface, accessible to fish that feed in upper tank regions. A mixed-species approach helps create more continuous food coverage across a tank, mirroring natural reef structure, so that no single zone is left without a natural food source.

 

Best For

 

Selective feeders including mandarinfish, dragonets, seahorses, pipefish, anthias, gobies, scooter blennies, wrasses, dwarf angelfish, clownfish larvae, and cardinalfish. Also well suited for reef inhabitants including LPS corals, SPS corals, non-photosynthetic corals, anemones, and filter-feeding invertebrates generally. Appropriate for display aquariums, refugiums, seahorse systems, and larval rearing tanks.

 

Production Standards — GAP Certified & Biosecure

 

Lion Pods™ copepods are produced exclusively by Similan Farm Clownfish, under the operation of Siam Seahorse Standard Co., Ltd., in Pathiu District, Chumphon, Thailand — a GAP-certified aquaculture facility audited by Thailand's Department of Fisheries. Every batch is cultured in a fully closed biosecure system with zero wild collection, which eliminates the pathway for introducing white spot disease, external parasites, or Oodinium that can accompany wild-collected or open-system live feed. Full batch traceability allows every culture lot to be tracked from inoculation through to dispatch. Copepods are harvested daily and shipped via cold-chain nationwide; every order includes our live arrival guarantee — if copepods arrive non-viable, we replace or refund.

 

Complete Usage Protocol

 

When to Add Copepods

 

Introduce copepods during initial tank setup to establish a base population before adding fish. It is generally advisable to add copepods at least one week before introducing selective feeders such as mandarinfish or seahorses, to allow the population time to settle and begin reproducing. Copepods are also commonly used to rebuild microfauna populations after medication, major water changes, or other environmental disturbances. As part of regular maintenance, small weekly or monthly additions can help sustain continuous biodiversity and food availability throughout the system.

 

How to Release for Maximum Survival

 

Turn off return pumps, UV sterilizers, and protein skimmers for 10 to 20 minutes before release, to prevent copepods from being damaged or immediately removed by filtration. Release in the evening or after lights-out, when fish are less active, to give copepods time to disperse, find shelter, and begin reproducing before daytime feeding pressure begins. Place them directly into a refugium, near macroalgae such as Chaetomorpha, or in low-flow areas around live rock. Avoid releasing near overflow boxes or high-flow return lines.

 

Sustaining a Self-Sustaining Population

 

Feeding a quality microalgae blend one to three times weekly provides a continuous food source that supports copepod reproduction. Establishing permanent habitat — including macroalgae, porous live rock, and deep sand beds — gives copepods more shelter, which generally supports a larger and more stable population over time. A mixed-species approach that includes both benthic and pelagic types tends to offer the best long-term result and most closely replicates natural reef function.

 

Storage After Arrival

 

Refrigerate at 2 to 8 degrees Celsius with the lid slightly open for gas exchange. Use within 24 to 48 hours of receipt for maximum viability. Avoid direct sunlight and extreme temperature fluctuations.

 

Frequently Asked Questions

 

What are live copepods?

Live copepods are microscopic marine crustaceans that serve as a primary natural food source for many marine fish and invertebrates, providing nutrition across multiple life stages from nauplius through adult.

 

Why choose GAP-certified copepods?

GAP certification means every batch is produced under government-audited, standardized protocols in a closed biosecure system, which significantly reduces the risk of introducing disease or parasites compared to wild-collected or uncertified sources.

 

What makes copepods different from Artemia or rotifers?

Copepods are documented in aquaculture literature to offer a naturally broad nutritional profile without requiring the artificial enrichment step typically used for Artemia and rotifers. Artemia enrichment is understood to degrade relatively quickly after hatching, and rotifers are generally too large for the mouth gape of the smallest first-feeding larvae, which is the core problem copepod nauplii are used to solve.

 

Do copepods help keep the aquarium clean?

Benthic copepods consume detritus, uneaten food, film algae, and nuisance microfauna such as ciliates. Over time they contribute to processing organic waste before decomposition, supporting water quality alongside — not replacing — standard aquarium maintenance.

 

Should I use one species or mix several?

A mixed-species combination is generally recommended. Different species occupy benthic, mid-water, and surface zones, together providing more continuous food coverage throughout the aquarium.

 

Is Tigriopus sirindhornae the same as Tigriopus thailandensis?

Yes. T. thailandensis (2012) is the accepted name under WoRMS; T. sirindhornae (2013) is a published synonym now treated as referring to the same taxon. Both names refer to the identical strain in continuous cultivation since 2013; our product listings may reference either name during this naming transition.

 

Why are my copepods mostly hiding?

Copepods naturally seek shelter in live rock, crevices, and macroalgae — this is normal behavior and is where they reproduce most successfully. A healthy, reproducing population is commonly present even when it is not clearly visible to the eye.

 

How long before they establish a self-sustaining population?

Under generally favorable conditions — adequate food, shelter, and stable temperature — copepods commonly begin reproducing within one to two weeks, with a more visibly established population typically developing within four to six weeks. These are general operational observations rather than a guaranteed or scientifically measured timeline, and actual results will vary by tank conditions.

 

Can copepods survive with the protein skimmer running?

Yes, generally. Once a population is established in a refugium, live rock, and sand bed, it can typically sustain itself under normal filtration. It is advisable to turn the skimmer off temporarily only during the initial release period, then resume normal operation.

 

What is your live arrival guarantee?

Every order is shipped via cold-chain direct from our farm in Chumphon. If copepods arrive non-viable, we replace or refund — guaranteed.

 

Scientific References

 

Tangsitthiwat, S., Hemwech, K. & Koolkalya, S. (2025). Nursing Coral Grouper Larvae with Different Feed Strategies. Trat Coastal Aquaculture Research & Development Center, Rambhai Barni Rajabhat University. — Source of reported survival-rate figures for Coral Grouper (Plectropomus leopardus) larviculture under copepod-supplemented feeding.

 

Callan, C.K. et al. Leopard Coral Grouper Hatchery Manual. Center for Tropical and Subtropical Aquaculture Publication #165, USDA National Institute of Food and Agriculture. — Institutional hatchery reference; note that copepod species discussed in this manual may include Calanoida such as Parvocalanus crassirostris in addition to harpacticoid copepods, and is cited here for general larviculture context rather than as species-specific evidence for Tigriopus thailandensis.

 

Burgess et al. (2019). Improved survival in larval Plectropomus leopardus using copepod nauplii as first feed. Aquaculture. — Source of reported growth-measurement figures (length and width at 21 days) for copepod-fed versus rotifer-fed larvae.

 

WoRMS Editorial Board. World Register of Marine Species — Tigriopus thailandensis (accepted name); Tigriopus sirindhornae (synonym). Continuous cultivation of this strain since 2013 at Pathiu, Chumphon, Thailand.

 

Evidence Boundary

 

Nutritional characteristics described in general terms (protein content, fatty-acid diversity, pigments) reflect documented properties of harpacticoid copepods as a group in aquaculture literature, and are not presented as a species-specific biochemical assay of Tigriopus thailandensis unless explicitly stated. Performance figures (survival rate, growth measurements) are drawn from specific published trials involving a specific fish species and are presented as study-specific findings, not universal guarantees. Population-establishment timeframes in the FAQ reflect general operational experience, not a cited scientific measurement. Production standards are audited under GAP protocols. Species identity is verified under WoRMS, with the accepted name (Tigriopus thailandensis) used as primary and the synonym (Tigriopus sirindhornae) noted for continuity with prior product labeling. All claims are bounded by the verifiable scientific and operational evidence cited above.

 

Content Review & Governance

 

This page is maintained under the evidence-governed framework of the Marine Plankton Knowledge Platform™, operated by Siam Seahorse Standard Co., Ltd. (brands: Similan Farm · Lion Pods™). Species identity and evidence-boundary accuracy are reviewed against this platform's Canonical Species Reference for Tigriopus thailandensis / Tigriopus sirindhornae. This page will be updated if the accepted taxonomic name changes, if new species-specific nutritional data becomes available for this cultivation strain, or if the cited performance studies are revised or retracted. Updates are logged against the Version number above.