What temperature should Neocaridina be kept at?
Evidence review: August 12, 2026
There is no single published temperature that answers every care question. Adult survival, juvenile growth, egg-development time, reproduction, offspring sex ratio and transport are different outcomes. A number tested for one outcome is not automatically a safe limit or an ideal home setting.
The short version: choose and record a house operating condition instead of chasing a species-wide ideal. Measure the water itself. Use a heater only when it helps maintain that chosen condition. Do not turn an outdoor forecast, a short experiment or an egg-development result into a survival boundary.
What controlled studies found
| Tested conditions | Measured result | What it does not establish |
|---|---|---|
| 24, 28 and 32°C, about 75, 82 and 90°F | Mean egg incubation was 20.8, 14.6 and 12.4 days. About 24 juveniles hatched per female at all three temperatures. Juvenile survival and final weight did not differ statistically over the 90-day growth period. The later proportion of ovigerous females was highest at 28°C, and every growth-period female that carried eggs at 32°C lost them.1 | A chronic safe range, a lethal limit, a lifespan result or an instruction to keep every home colony at 28°C |
| 28 and 33°C, about 82 and 91°F, for 200 days | Females developed mature ovaries and spawned at 28°C. No ovigerous female was found at 33°C. Females transferred from 33 to 28°C resumed ovarian maturation and spawning.2 | That 33°C is an acute death point, or that every effect at that temperature is irreversible |
| 20, 24 and 28°C, about 68, 75 and 82°F | Survival exceeded 90% in all treatments. Female weight, female colour, total carotenoids and measured spermatophore quality did not differ statistically. At 20°C, ovarian maturation was delayed and fewer females were ovigerous at the end. Other biochemical and male-weight measures differed among treatments.3 | That every temperature from 20 to 28°C is equivalent, or that the study measured lifetime survival |
These studies used particular red lines, diets, densities, water, aeration, light schedules and constant-temperature treatments. Their results travel with those conditions.
Warmer is not simply better
The strongest repeated result is narrower than the usual slogan. Warmer treatments shortened egg development in the tested experiments.1 That does not mean warmer water improves the whole life cycle. The same study found poorer later reproductive performance at 32°C, and the 200-day study found spawning suppressed at 33°C.2
No study above measured full natural lifespan. A shorter incubation period is not proof that heat shortens lifespan, and a 90-day survival result is not a chronic safety boundary. See why an early growth difference, final size and longevity are separate outcomes.
Temperature and offspring sex need replication
One 180-day experiment used nine aquaria, three at each of 20, 23 and 26°C. The reported female proportions among sampled offspring were 82.76%, 52.15% and 20.73%. Survival was 86.15%, 89.78% and 90.13%.4 The paper states that 30 offspring were sampled from each temperature group.
That is an important result to replicate, not a proven recipe for producing females or males. The 24, 28 and 32°C experiment found no statistically significant sex-ratio difference.1 The studies used different stocks and protocols, and neither establishes the mechanism or a universal temperature-sensitive window.
A cool rearing observation is not a cold-tolerance trial
One 2025 growth series recorded 16.9 to 19.1 C while pooled offspring grew in a single rearing tank from hatching through 60 days.6 The paper reported visible growth and no visible anomaly, but it assigned no temperature treatment, had no warmer comparison and did not report a survival denominator.
Those observations show that sampled animals were present and growing during that recorded history. They do not show that development was unaffected, establish a chronic minimum, demonstrate broader temperature tolerance or make 17 C a home target. pH and nitrogen readings also changed through the same period, while every juvenile shared one tank, so temperature cannot be isolated from the rest of the culture history.
Our house temperature is a reproducible choice
Our practice We use 72-75°F as the operating recipe for our own racks. It is not presented as the species' ideal or tolerance boundary. We publish the latest measured source-tank temperature with each shipment so the receiving keeper can compare actual water.
For a home tank, make the heater decision from measurements:
- Log actual tank-water temperature at the same locations and times for at least seven days. Include the daily minimum and maximum if the instrument records them.
- Name the outcome you are managing, such as an adult display or a reproducing colony. Choose an operating condition you can document without claiming it is a species limit.
- Add a thermostatic heater only if the unheated tank does not hold that chosen condition. A warm room is not proof of water temperature, and heater ownership is not proof of control.
- Verify the heater and thermometer against a second instrument before relying on either. Keep the reading location, time and instrument identity in the log.
When the reading is unexpectedly hot or cold
- Confirm the water reading with a second thermometer.
- Check heater state, room conditions, filter flow and aeration.
- If animals show distress, measure total ammonia nitrogen and nitrite, and dissolved oxygen when that instrument is available. Temperature alone does not diagnose the event.
- Remove the failed heat source or room exposure, restore aeration and make a controlled correction. Do not put ice or a hot object against the animals or assume a fixed correction rate is proven safe.
- Record water temperature over time, actions, mortality and recovery. That trace is more useful than a single peak reading.
Use the filtration guide to separate urgent air or flow restoration from an invented oxygen threshold or safe outage time.
Shipping weather is not bag temperature
Outdoor forecasts describe weather at a place. They do not measure the water in a bag, the temperature inside an insulated box, a loading dock or a delivery vehicle. Our 35 to 90°F forecast gate and our heat-pack and cool-pack rules are conservative house operating rules pending package validation. They are not published N. davidi survival limits.
The ornamental-shrimp transport review found major species-specific evidence gaps across temperature, oxygen, nitrogenous waste and other transport variables.5 We therefore validate a packing combination with temperature loggers, measured bag water, transit time and survival records. A successful box establishes only that the recorded combination worked under those conditions.
What the evidence does not prove
- There is no validated universal ideal temperature for every colony outcome.
- There is no published home-aquarium heater threshold for the species.
- The reviewed studies do not establish an exact chronic minimum, maximum or lethal temperature.
- No reviewed experiment proves that a particular daily fluctuation is safe, or that stability matters more than the actual temperature.
- Warmer incubation does not prove better lifetime performance.
- An outdoor forecast does not reveal what shrimp experience inside a box.
Primary sources and evidence review
- Tropea, Stumpf and López Greco, 2015. Effect of Temperature on Biochemical Composition, Growth and Reproduction of the Ornamental Red Cherry Shrimp. PLOS ONE 10(3): e0119468.
- Baliña, Temperoni, López Greco and Tropea, 2018. Losing Reproduction: Effect of High Temperature on Female Biochemical Composition and Egg Quality. The Biological Bulletin 234(3): 139-151.
- Tomas, Sganga, Battista and López Greco, 2021. Body coloration, carotenoid content, spermatophore quality and biochemical parameters by effect of temperature. Acta Zoologica 102(3): 297-309.
- Serezli et al., 2017. To what extent does temperature affect sex ratio in red cherry shrimp? Fresenius Environmental Bulletin 26(12): 7575-7579.
- Holroyd et al., 2026. An ecophysiological approach to improving health outcomes of ornamental shrimp during aquarium trade and transportation. Conservation Physiology 14(1): coag046.
- Pierre, Kotani and Irabor, 2025. Experimental measurement of enzyme activity during initial crustacean growth using the ornamental shrimp, Neocaridina denticulata, as a model and changes in activity with growth. Crustacean Research 54: 19-33.