PodDrop organism profile
Scientific identity, morphology, habitat, culture considerations, handling, and practical aquarium applications—organized as one detailed reference.
Identity & taxonomy
Current nomenclature, original description, type locality, and diagnostic context.
Biology & habitat
Documented morphology and habitat information, separated from broader observations about the genus Tigriopus.
Culture & handling
Conservative husbandry principles for maintaining a clean marine copepod culture.
Application context
Practical uses in reef aquariums and aquaculture without unsupported performance guarantees.
Scientific Classification & Taxonomy
Kingdom: Animalia | Phylum: Arthropoda | Subphylum: Crustacea | Superclass: Multicrustacea | Class: Copepoda | Order: Harpacticoida | Family: Harpacticidae | Genus: Tigriopus | Original species name: Tigriopus sirindhornae Chullasorn, Dahms & Klangsin, 2013
Current taxonomic note: The World Register of Marine Species currently lists Tigriopus sirindhornae as an unaccepted junior subjective synonym of Tigriopus thailandensis Chullasorn, Ivanenko, Dahms, Kangtia & Yang, 2012. PodDrop retains the name T. sirindhornae on this profile to identify the culture and to connect the page with the name used in the original 2013 description. The accepted scientific name should be disclosed wherever formal taxonomy is discussed.
Complete Tigriopus sirindhornae Species Profile for Marine Aquaculture
Tigriopus sirindhornae was formally described in 2013 from material collected in Thailand. Adult specimens were collected at low tide near the Eastern Marine Fisheries Development Centre at Ban Phe, Rayong Province. The authors also recovered developmental stages from washings of the brown alga Padina sp. The published type locality is therefore specific to Ban Phe rather than evidence of a fully mapped geographic range throughout Thailand.
The species name honors Her Royal Highness Princess Maha Chakri Sirindhorn of Thailand. This etymology explains the scientific name; it does not imply commercial endorsement, ownership, exclusivity, or authorization associated with any cultured population.
The original description was based on detailed microscopic examination of adult females and males. The female holotype measured 1.12 mm from the tip of the rostrum to the posterior margin of the caudal ramus, while the female type series had a reported mean length of approximately 0.96 mm. The male allotype measured 0.92 mm, and the male type series had a reported mean of approximately 0.90 mm. These are measurements of preserved type material, not a guaranteed size range for every cultured individual. Size can vary with developmental stage, preservation, nutrition, culture conditions, and measurement method.
The body was described as compact and cyclopiform. The formal diagnosis relies on fine anatomical characters, including patterns of body sensillae, the segmentation and armature of appendages, the structure of the mandible, maxillule, maxilla, maxilliped, and differences in the swimming legs. Sexual dimorphism was documented in the antennule, antenna, second swimming leg, fifth and sixth legs, and the segmentation of the posterior body. These features generally require specialist microscopy. Color, swimming behavior, or unaided visual inspection cannot confirm species identity.
The original taxonomic study reported that no color pattern could be discerned in the preserved material. Live cultured Tigriopus may display orange, red, brown, or variable pigmentation depending on diet, developmental stage, lighting, and physiological condition, but visible color alone should not be treated as a diagnostic feature or as a direct measurement of astaxanthin, fatty acids, or nutritional quality.
Tropical Adaptation and Environmental Tolerance
The type locality lies in tropical Thailand, so a tropical coastal origin is well documented. However, the 2013 species description did not establish species-specific optimum, acceptable, or lethal ranges for temperature, salinity, pH, dissolved oxygen, ammonia, or nitrite. Exact tolerance claims should therefore not be presented as experimentally established characteristics of T. sirindhornae unless they are supported by a study conducted on verified specimens of this taxon.
Members of the genus Tigriopus are associated with shallow coastal habitats that may experience environmental variation. Research on other Tigriopus species demonstrates that responses to temperature, salinity, and oxygen can differ among species and even among geographically separated populations of the same species. Genus-level hardiness is useful context, but a tolerance measured in T. californicus, T. brevicornis, or another congener should not automatically be assigned to this Thai culture.
For aquarium and culture use, stability remains the safer operating principle. Avoid abrupt changes in temperature or salinity, maintain adequate gas exchange, and prevent the accumulation of ammonia and decaying feed. A copepod surviving a short exposure does not mean that the same condition supports normal development, reproduction, or long-term population stability.
Any numerical culture range supplied by PodDrop should be labeled as a facility operating range or customer-handling recommendation derived from the current culture process—not as the complete biological tolerance of the species. Culture water and destination water should be matched gradually when their salinity or temperature differs.
Life Cycle and Reproduction
Like other copepods, Tigriopus develops through eggs, naupliar stages, copepodid stages, and the adult stage. Nauplii differ markedly from adults in body form and movement. Copepodids progressively acquire the segmented body and appendages associated with the adult. Mature males and females are sexually dimorphic, and reproductive females carry developing eggs externally.
The 2013 description focused on adult morphology and taxonomic diagnosis. It did not publish a controlled life-history experiment establishing clutch size, egg-development time, generation time, population-doubling time, adult lifespan, or lifetime fecundity for this species. Values reported for other Tigriopus species should not be presented as direct measurements of T. sirindhornae.
In culture, the rate of development and reproduction can be influenced by temperature, salinity, food quality, food availability, population density, water quality, and the condition of the founding animals. For this reason, a culture may contain many juveniles without showing an immediate increase in visible adults. Reproductive performance should be assessed from repeated observations rather than from a single bottle or sampling event.
Healthy culture assessment should focus on multiple indicators: active animals at more than one life stage, the presence of reproductive females, continued recruitment of nauplii and copepodids, acceptable water quality, and the absence of a rapid decline following feeding. Appearance alone is not sufficient to determine long-term culture stability.
Nutritional Composition and Value
Copepods are widely used as live prey because they provide movement, multiple prey sizes, and nutrients derived from both their own tissues and their recent diet. Their value in a feeding program is influenced by species, life stage, algal diet, culture conditions, gut content, harvest method, and storage time.
No species-specific proximate analysis or complete fatty-acid profile was reported in the original description of T. sirindhornae. Exact claims for protein, astaxanthin, EPA, DHA, total omega-3 content, digestibility, or amino-acid balance should not be attributed to this species without direct laboratory analysis of a verified culture. Measurements from other copepods can provide background information but are not substitutes for a product-specific analysis.
Feeding live microalgae can affect copepod gut fill and biochemical composition. Different algae contribute different pigments, fatty acids, sterols, amino acids, and particle sizes. A mixed algal diet may support broader culture objectives than a single feed, but the result depends on whether the copepod can ingest and utilize each alga and on the density and condition of the feed. The visible color of the copepod is not a quantitative nutrient test.
For reef aquariums, live copepods should be treated as one component of a varied feeding and husbandry program. They can provide natural prey and foraging activity, but they should not be represented as a guaranteed complete diet for every fish, coral, or larval species.
Tropical Reef Aquarium Applications
Supplemental live prey: Fish that naturally search rockwork, substrate, macroalgae, and other surfaces may consume harpacticoid copepods when the prey is accessible and appropriately sized. Individual feeding response varies with fish species, age, condition, prior diet, competition, and the availability of alternative foods.
Mandarins and other continuous grazers: Dragonets and other microcrustacean-feeding fish may consume Tigriopus, but adding a bottle does not guarantee that a display aquarium can sustain the animal’s long-term food requirement. Tank maturity, protected habitat, refugium production, predator density, and supplemental feeding remain important. A visibly active copepod population should not be used as the only evidence that an obligate grazer is receiving adequate nutrition.
Reef-system biodiversity: Harpacticoids commonly associate with surfaces, algae, detritus, and biofilms. When conditions permit, they may occupy rockwork, substrate, macroalgae, sump chambers, and refugia. Establishment is not guaranteed because predation, filtration, nutrient availability, maintenance practices, and competing microfauna can limit the population.
Breeding and aquaculture: Copepods can be useful live-feed organisms in some ornamental and marine aquaculture programs. Suitability depends on the target animal’s mouth size, feeding behavior, prey density requirement, and developmental stage. Before using this culture for sensitive larvae, validate prey size, water compatibility, feeding density, and nutritional protocol at the scale of the intended program.
Coral feeding: Some corals and other suspension-feeding invertebrates may capture copepod life stages when those stages enter the water column. Capture and nutritional contribution vary substantially among taxa and systems. The presence of copepods should be described as potential supplemental prey rather than a guaranteed coral-feeding result.
Culture Requirements and Methods
Culture water and acclimation:
- Use clean, conditioned marine water free of chlorine, copper, and medication residues.
- Begin with salinity and temperature close to the source culture whenever possible.
- Make necessary environmental changes gradually; avoid transferring animals directly between strongly different conditions.
- Maintain stable water quality rather than relying on presumed tolerance to poor conditions.
Container and aeration:
- Use a clean, non-toxic vessel reserved for live-culture work.
- Provide gentle aeration or reliable surface movement sufficient for gas exchange without creating violent turbulence.
- Leave access for observation, feeding, and harvesting while protecting the culture from aerosols, pests, household chemicals, and cross-contamination.
- Keep an independent backup culture when continuity is important.
Feeding:
- Live microalgae may be used as a primary feed when the algal strain and particle size are suitable for the culture.
- Add small quantities and observe consumption before feeding again.
- Avoid allowing uneaten feed to accumulate, darken, or decompose.
- When using concentrated or non-living feeds, begin conservatively because bacterial growth and oxygen demand can rise quickly.
- Record feed type, amount, frequency, water appearance, odor, and population response so the process can be adjusted from evidence rather than assumption.
Maintenance:
- Inspect the culture regularly for active adults, juveniles, reproductive females, fouling, contamination, and changes in water quality.
- Use partial water replacement as needed to control accumulated waste while avoiding sudden environmental change.
- Remove decomposing material carefully without stripping the culture of all attached biofilm or juveniles.
- Use separate tools for different species or culture lines and sanitize equipment between systems.
Harvesting:
- Harvest conservatively and leave enough animals of multiple life stages to continue recruitment.
- Select an appropriate mesh or collection method based on the life stages required.
- Avoid prolonged exposure to air, excessive mechanical agitation, or strong temperature change during collection.
- Replace removed water with prepared water that closely matches the culture.
Adding to an aquarium:
- Follow the current product label and product-page directions for the supplied format.
- Introduce the culture into an established marine system with suitable salinity and temperature.
- Reducing mechanical removal briefly during introduction may improve initial distribution, provided oxygenation and animal safety are maintained.
- Rockwork, macroalgae, and refugia can provide protected habitat, but no dosing amount can guarantee permanent establishment in every aquarium.
Advantages Over Other Copepod Species
Tropical provenance: The published type locality is in tropical Thailand. This makes the taxon relevant to discussions of tropical coastal Tigriopus, but provenance alone does not establish universal temperature optima or superiority in reef aquariums.
Harpacticoid behavior: Harpacticoids are generally associated with surfaces and benthic microhabitats. This can complement more planktonic copepods that spend a greater proportion of time in the water column. Neither strategy is universally better; the appropriate organism depends on the intended consumer and system.
Multiple life stages: A reproducing culture can contain nauplii, copepodids, and adults, creating a range of prey sizes. The actual stage distribution at delivery or after introduction varies and should not be assumed without observation or counting.
Observable culture activity: Adult Tigriopus can be relatively easy to see compared with smaller copepod taxa. Visibility can help with routine observation, but it does not measure concentration, purity, species identity, or nutritional composition.
Complementary use: This culture may be used alongside smaller harpacticoids, planktonic copepods, and appropriately selected phytoplankton. Mixed-species or sequential feeding strategies should be based on the target animal, system design, and husbandry goal rather than on claims that one copepod is best for every application.
Considerations and Limitations
Taxonomic status: Tigriopus sirindhornae was described as a distinct species in 2013, but WoRMS currently accepts it as a junior subjective synonym of Tigriopus thailandensis. Scientific nomenclature can change as specialists reevaluate morphology, type material, and other evidence.
Identification: Formal identification within Tigriopus depends on detailed anatomical characters and may also benefit from molecular comparison. Color, geographic story, bottle labeling, or commercial source alone cannot independently verify species identity. If a cultured line has been independently examined, the method, examiner, date, and reference material should be documented separately.
Limited applied data: The primary publication documents taxonomy, morphology, and type locality. It does not establish the extensive species-specific nutritional, reproductive, aquarium-performance, or environmental-tolerance figures sometimes repeated in commercial descriptions. Those subjects should be described cautiously until direct evidence is available.
Culture variability: Population growth and nutritional composition depend on feed, water quality, temperature, salinity, density, microbial community, harvest timing, and handling. Results observed in one facility should be labeled as operational experience and may not reproduce identically in another system.
Aquarium outcomes: Establishment and feeding outcomes cannot be guaranteed. Predation, filtration, tank maturity, protected habitat, husbandry practices, and the condition of the receiving system all influence what happens after introduction.
Scientific sources:
Chullasorn, S., Dahms, H.-U. & Klangsin, P. (2013). A new species of Tigriopus (Copepoda: Harpacticoida: Harpacticidae) from Thailand with a key to the species of the genus. Journal of Natural History, 47, 427–447. https://doi.org/10.1080/00222933.2012.757660
World Register of Marine Species. Tigriopus sirindhornae Chullasorn, Dahms & Klangsin, 2013. WoRMS taxon record.
Raisuddin, S. et al. (2007). The copepod Tigriopus: a promising marine model organism for ecotoxicology and environmental genomics. Aquatic Toxicology, 83, 161–173. PubMed record.
Samat, N. A. et al. (2020). Enhancement of live food nutritional status with essential nutrients for improving aquatic animal health. Animals, 10, 2457. Full-text record.
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