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Nigerian hover shrimp

Desmocaris trispinosa

The shrimp that hovers: unique West African species (Nigeria) with 'hovering' behavior — suspended mid-water with elegant movements, like a tiny living helicopter. Tank with CALM current mandatory. Group of at least 10 to observe natural schooling behavior. Freshwater breeding: large eggs carried for 5–6 weeks, offspring born fully formed. Leaf litter as permanent food and refuge. Lid mandatory: escape artist.

Taxonomy
Class:Malacostraca
Order:Decapoda
Family:Desmocarididae
Genus:Desmocaris
Species:Desmocaris trispinosa

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Water Temperature

22 - 28 °C

pH Value

6 - 7.5

Water type

Freshwater

Invertebrate type

Freshwater shrimp

Adult size

4 cm

Minimum group

>= 10

GH

3 - 20 dGH

KH

0 - 3 dKH

TDS

45 - 330 ppm

Ecological role

Scavenger

Copper sensitivity

High

Species description

Geographical Origin and Habitat: Endemic to a highly restricted range across West and Central Africa, primarily documented in Nigeria, Cameroon, and Equatorial Guinea. Desmocaris trispinosa (the Nigerian Floating Shrimp) is a uniquely specialized blackwater crustacean. It naturally colonizes incredibly slow-moving, deeply shaded, completely stagnant jungle pools and heavily vegetated swamps. These micro-habitats are fundamentally defined by pristine, highly acidic, tannin-stained water completely choked with massive tangles of roots, floating plants (like Water Lettuce), and decaying leaf litter.
Taxonomy: Scientifically classified within the Desmocarididae family, it is a highly distinct, evolutionary oddity in the shrimp world. Taxonomically, its specific name "trispinosa" refers to the three distinct forward-pointing spines on its rostrum. Morphologically, it possesses a delicate, laterally compressed body (reaching 3-4 cm) and uniquely positioned, large, prominent eyes. Its most defining and spectacular adaptation is its swimming behavior: rather than crawling on the substrate, it actually hovers and "floats" stationary in the mid-water column, resembling a microscopic helicopter.
Social Behavior: They are utterly peaceful, entirely defenseless, and incredibly fascinating mid-water invertebrates. Unlike traditional dwarf shrimp (like Cherry Shrimp) that spend their lives crawling on the substrate, Nigerian Floating Shrimp are completely pelagic. They spend their entire day hovering perfectly still in the open water or hiding among the trailing roots of floating plants, constantly sweeping the water column for food. They are gregarious and rely absolutely on the presence of a colony (minimum 6-8 individuals) to feel secure enough to float in the open.
Coloration and Sexual Dimorphism: Sexual dimorphism is distinct, particularly in breeding colonies. Females are noticeably larger, bulkier, and possess a visibly curved underbelly to accommodate massive clutches of eggs. Males are significantly sleeker, smaller, and more streamlined. The coloration is highly camouflaged to blend into African blackwater swamps. The body is completely transparent or a pale, glassy, translucent amber-green. The defining visual features are their exceptionally large, black, highly protruding eyes and a stark, bright green "saddle" (ovaries) visible in mature females.

Care, breeding and tankmates

Tank Setup: The aquarium architecture must perfectly replicate a completely stagnant, claustrophobic African blackwater pool to accommodate their pelagic hovering behavior. A minimum 30-liter nano-tank is required. The absolute most critical requirement is a massive, unbroken canopy of floating plants (Water Lettuce, Salvinia, or Frogbit); they spend 90% of their time hovering motionless upside-down beneath these floating leaves. Dim lighting and a thick carpet of Indian Almond leaves on the substrate are absolutely mandatory to release essential humic acids.
Diet and Feeding: In their natural stagnant swamps, they are mid-water filter feeders and micro-predators. They use their specialized, bristle-equipped front claws to continuously snatch microscopic zooplankton, floating detritus, and infusoria directly out of the water column. In captivity, they will eventually learn to scavenge the bottom, but their diet MUST consist of fine, suspended foods. They eagerly accept powdered spirulina, finely crushed high-quality shrimp flakes, and specifically, live liquid infusoria or newly hatched baby brine shrimp squirted directly into their hovering path.
Water Quality: Originating from pristine African jungle swamps, they are absolute extreme blackwater specialists. They demand warm tropical temperatures (24-28°C / 75-82°F) and strictly require incredibly soft, highly acidic water (pH 5.5 - 6.5) heavily saturated with botanical tannins to survive long-term. In hard, alkaline tap water, they will suffer massive physiological stress and die within weeks. Because they hover in the mid-water, filter flow MUST be virtually zero; strong currents will violently blow them around the tank, causing fatal exhaustion. A mature sponge filter is ideal.
Compatibility and Tankmates: Compatibility is the single greatest challenge. Because they hover motionless in the open water column, they are the absolute perfect, easy target for virtually any fish. They MUST ideally be kept in a strict, dedicated species-only setup. If housed with fish, any species larger than a neon tetra will ruthlessly hunt and swallow them whole. The only remotely acceptable tankmates are ultra-peaceful, microscopic bottom-dwellers (like Pygmy Corydoras) or other specialized nano-shrimp. Never mix them with aggressive mid-water swimmers.
Aquarium Breeding: Breeding is possible but highly challenging, requiring pristine blackwater conditions and a massive source of microscopic food. They are direct developers. The female develops a bright green "saddle" of unfertilized eggs. Following molting and a frantic mating ritual, she moves 15-30 massive, bright green eggs beneath her tail. She carries these eggs for 3-4 weeks. The eggs hatch into perfectly formed, microscopic replicas of the adults that instantly begin hovering in the mid-water. The pelagic fry require immense amounts of liquid infusoria to prevent starvation.
Risks and Diseases: The absolute greatest physical risk is physiological collapse and failed molting caused by improper water chemistry (keeping them in hard tap water or water lacking botanical tannins). The second major risk is lethal exhaustion from power filters; they are completely incapable of swimming against a current. Medically, like all invertebrates, they are instantly killed by copper-based medications; even microscopic trace amounts of copper from old pipes or fish meds will exterminate the colony.

Geographic Origin and Distribution

Endemic to a highly restricted range across West and Central Africa, primarily documented in Nigeria, Cameroon, and Equatorial Guinea. Desmocaris trispinosa (the Nigerian Floating Shrimp) is a uniquely specialized blackwater crustacean. It naturally colonizes incredibly slow-moving, deeply shaded, completely stagnant jungle pools and heavily vegetated swamps. These micro-habitats are fundamentally defined by pristine, highly acidic, tannin-stained water completely choked with massive tangles of roots, floating plants (like Water Lettuce), and decaying leaf litter.

Origin

Tropical oceans and reefsAfrica and MadagascarEast Asia

Invertebrate profile

Diet
Omnivore
The diet of Desmocaris trispinosa must be carefully managed to ensure robust health, vibrant coloration, and long-term survival in captivity. In its natural environment, it has specific foraging habits that should be replicated as closely as possible in the aquarium. Supplementing its diet with high-quality, targeted commercial foods or fresh preparations ensures it receives necessary vitamins and minerals. Care should be taken not to overfeed, as uneaten food will quickly degrade water quality and harm the animal.
Ecological role
Scavenger
Within its native ecosystem, Desmocaris trispinosa plays a vital biological role that contributes to the overall stability of the environment. Whether acting as a scavenger, filter feeder, predator, or prey, it helps to efficiently cycle nutrients through the food web. Its natural behaviors prevent the over-accumulation of organic waste or the unchecked growth of specific prey populations. Introducing this species to a home aquarium often replicates these beneficial ecological functions, promoting a cleaner and more balanced system.
Shock sensitivity
Medium
Aquarists must be aware that Desmocaris trispinosa is exceptionally sensitive to rapid fluctuations in its surrounding water parameters. Sudden shifts in temperature, specific gravity, pH, or dissolved organics can induce severe physiological shock, leading to rapid decline or death. A prolonged and careful drip acclimation process is highly recommended whenever moving this animal between systems. Maintaining pristine and unwavering water conditions is arguably the single most critical factor for its successful husbandry.
Calcium and minerals
Medium
Proper mineral balance is crucial for Desmocaris trispinosa, as it requires consistent access to dissolved calcium and related trace elements for physiological maintenance. Depending on its specific biology, calcium is utilized for building external shells, hardening exoskeletons after molting, or supporting skeletal growth. In enclosed aquarium systems, these essential minerals can be rapidly depleted and may require regular supplementation. Routine water testing is encouraged to ensure that general hardness or specific calcium levels remain within the optimal range.
Molting
Regular
For invertebrate species that undergo ecdysis, Desmocaris trispinosa requires a safe and stress-free environment to successfully shed its old exoskeleton. During and immediately following a molt, the animal's new shell is soft, leaving it extremely vulnerable to physical damage and predation. It is important to provide ample hiding spaces where it can retreat until its body fully hardens. If applicable, the discarded exoskeleton should be left in the tank, as the animal will often consume it to reclaim vital minerals.
Reproduction
Oviparous
The reproductive strategies of Desmocaris trispinosa are varied and often highly adapted to its natural environmental conditions. Breeding efforts in a captive aquarium setting can range from straightforward to exceedingly difficult, often depending on specific larval requirements. Successful rearing of young frequently involves managing microscopic planktonic stages and specialized diets away from the main display tank. Nevertheless, captive propagation remains a rewarding endeavor that helps reduce the reliance on wild-caught specimens.
Compatibility & tankmates
Peaceful
Careful consideration of tank mates is required to ensure the safety and wellbeing of Desmocaris trispinosa in a community setup. It should generally be housed with peaceful species that will not relentlessly harass it, nip at its appendages, or view it as a food source. Conversely, its own predatory or territorial instincts must be evaluated to ensure it does not harm smaller or slower-moving tank inhabitants. Observation during the initial introduction period is vital to confirm a harmonious balance within the aquarium.

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Last updated: 06/30/2026
Nigerian hover shrimp (Desmocaris trispinosa) Care Guide & Tank Setup | Atlarium