Cool floor and hides

Spread the specified substrate and set cork and low hides close to the ground without burying entrances in litter. Keep both moist and less-moist retreats reachable and test leaving the shallow dish. Aquatic larvae belong in the separate tank described under breeding.

Testing and access

Connect specified heat sources to compatible thermostats and guard against contact. Secure probes according to device instructions; measure air at resting sites and heated surfaces separately with independent instruments. In housing with water, also check water temperature and quality: one zone’s thermostat does not control the others.

With the complete enclosure running, record day and night readings and compare them with the sheet. Test doors, cable openings and cleaning access, keeping vents clear. Change one variable at a time and recheck after each adjustment.

Light in the animal’s daily life

This guidance concerns the terrestrial stage and is not transferred to aquatic larvae. Keep moist dark burrows and check that the lamp does not overheat the substrate.

An example layout in the enclosure

To make the layout concrete, take housing measuring 60 × 40 × 40 cm, using the first dimensional configuration in the sheet. This is a mounting example: retain the conditions and any alternatives attached to the stated minimum.

In a wooden enclosure with internal lighting, imagine the tube 35 cm above the floor and the back or head at 15 cm. The geometric distance is therefore 20 cm. The branch or platform lies below animal height, according to body size. Place lighting over one side, with a route to fully screened retreats.

In a glass enclosure with a mesh roof, retain the same animal height and imagine the tube 5 cm above the mesh: distance becomes 30 cm. Mesh attenuates UV variably; ordinary glass roofs block UVB. Increasing the percentage alone is insufficient: measure beneath the mesh and adjust height, output or layout as needed.

These distances describe the example, not a safe clearance for every lamp. Select the source and adjust mounting until approximately UVI 1–2 is measured at animal height in the exposed position. Also respect the minimum clearance specified for the model used. Recheck with furnishings, guards and mesh installed, including the highest reachable points and animal growth.

Choosing and checking lighting

First define the patch that should illuminate the whole body and the route to a screened retreat. For a broad patch, select a linear tube with reflector; consider a compact only if its useful patch covers the body and leaves an accessible gradient. Check model, output, reflector and mounting distance, then compare measured UVI with the species target. Label UVB percentage alone cannot determine distance and intensity.

The decisive check uses a UVI meter facing the source at animal height. Check the centre and edges of the exposed patch, the highest supports and retreats, which must allow withdrawal from UV. Repeat after moving equipment, changing lamps and plant growth. Without a meter, use the manufacturer’s instructions and measurements for the exact configuration, including safety clearances.

When UVB or UVA are absent

When keeping without UVB, D3 must be supplied through a complete diet or species-appropriate supplementation. Calcium alone does not replace D3. Check existing amounts in prepared diets and multivitamins before combining products; dosage also depends on diet and cannot be derived from lighting hours.

UVA has no dietary replacement. Maintain appropriate illumination and photoperiod without adding an intense source to compensate for unverified information: amphibian exposure must be evaluated by species and life stage.

Sex, maturity and readiness

Verify species and locality: many “tiger salamanders” belong to A. mavortium. Sexing is clearer in seasonal adults through the larger male cloaca. Retain lineage identity: do not treat a large larva as a ready adult.

Start a record for each breeding animal with identity, origin, documented age and previous weights. Compare the weight trend with growth and body condition; delay introductions for animals still growing rapidly, losing weight or recently acquired. Use stated ages as guidance alongside these checks. If sex cannot be identified reliably, obtain assessment by qualified personnel before pairing.

Preparation and seasonal cycle

Terrestrial populations migrate to breeding pools after rains; captive induction is poorly predictable. Provide water connected to land and follow locality-specific seasonality rather than imposing an axolotl schedule.

Before encounters, prepare and test offspring enclosures and have first foods available. Check records for regular adult feeding and good body condition, then verify access from exposed areas to retreats. If the species protocol includes seasonal changes, adjust settings gradually and record the response. Record night-time air, surface and egg temperatures separately, noting where each is measured. Keep water available throughout preparation.

Courtship and mating

Courtship occurs in the pool and includes spermatophore transfer. Provide nonabrasive bottom surfaces and supports, calm water and unobstructed exits. Record behaviour without repeatedly moving adults between warm and cold conditions to provoke it.

Spawning and egg collection

Eggs are attached to submerged structures, singly or in groups depending on population. Move supports into a separate larval system while preserving jelly. Failure to spawn does not justify improvised hormonal treatment.

Aquatic development and hatching

Hatching in 19–50 days is reported across the complex and different conditions; this does not define one thermal protocol for A. tigrinum. Record locality, temperature and stage, and do not transfer values from neotenic to terrestrial populations.

Use water treated for chlorine and chloramine at the same temperature as the original container. Guard intakes and keep movement gentle. Check eggs and water daily, remove dead material without breaking healthy eggs, siphon leftovers and faeces, test ammonia and nitrite and change water with prepared water as needed.

First meals and juvenile care

Larvae are predators: offer small cultured aquatic prey and separate different sizes or aggressive individuals. As gills regress, immediately provide emerged transition space with damp hides. Metamorphs switch to small earthworms and mouth-sized insects.

Observe each larva’s feeding, growth and developmental stage daily, avoiding unnecessary capture for weighing. Also check water quality, injuries and size differences: a feeding group does not establish that every larva eats. Separate injured individuals or those excluded from food, and adjust space and diet as they develop. For forms that become terrestrial, prepare gentle exits and shelters before the transition to land.

Female recovery

After reproduction provide water and the usual balanced diet, initially in manageable portions; monitor weight, activity and return of appetite. Keep supplements and lighting consistent with the feeding guide. Avoid further introductions until the previous condition has recovered; later clutches may occur without another mating. Persistent straining, weakness or protruding tissue require veterinary attention, without squeezing the abdomen.

Equipment and example diary

Prepare rearing tanks, covers, a mature sponge filter or containers for regular water changes, water tests, a narrow siphon, thermometer and productive first-food cultures. The number of offspring raised must match the actual capacity to feed them and maintain clean water.

A consistent diary using actual dates helps follow reproduction in Ambystoma tigrinum. Start with adult identity, weight and condition, then record observed encounters, laying or birth and development conditions. After emergence record the first meal actually accepted and each youngster’s growth while continuing to follow female recovery. Over time these records help identify your lineage’s pattern without turning approximate durations into deadlines.