Reptile · Semi-aquatic turtle
Black-knobbed map turtle care guide
Graptemys nigrinoda
The black-knobbed map turtle is a intermediate-level semi-aquatic turtle from Alabama and Mississippi river systems, USA. Adults reach Females 13–20 cm, males 8–10 cm and live 20–30 years in captivity. A smaller map turtle that still needs a large water section with strong filtration.
- Enclosure 150 × 60 × 60 cm
- Temp Water 24–26°C, basking 30–35°C
- Humidity Not critical (aquatic)
How much does a black-knobbed map turtle cost in Canada?
Black-knobbed map turtle quick facts
- Skill level
- Intermediate
- Adult size
- Females 13–20 cm, males 8–10 cm
- Lifespan
- 20–30 years
- Activity
- Diurnal
- Native range
- Alabama and Mississippi river systems, USA
- Minimum enclosure
- 150 × 60 × 60 cm (59 × 24 × 24 in, ≈ 143 US gal)
- Housing
- Best kept alone.
- Temperature
- Water 24–26°C, basking 30–35°C
- Humidity
- Not critical (aquatic)
- UVB
- Required
- Diet
- Omnivore – pellets, insects, snails, aquatic plants
- Bioactive style
- Semi-aquatic (paludarium)
Black-knobbed map turtle enclosure & bioactive setup
Give one adult at least 150 × 60 × 60 cm (59 × 24 × 24 inches). Best kept alone. This species suits a semi-aquatic (paludarium) bioactive build.
- Leaf litter2 cm
- Jurassic ABG Terrarium Mix8 cm
- Drainage – clay bio balls4 cm
Quantities assume about half the floor is land. The water half needs a filter and regular partial water changes.
Temperature: Water 24–26°C, basking 30–35°C. Humidity: Not critical (aquatic). UVB: Required.
What does a black-knobbed map turtle eat?
Omnivore – pellets, insects, snails, aquatic plants. Feed adults every 1–2 days.
Handling, temperament & health
Shy; avoid handling.
Health watch: Shell rot and skin infections from poor water quality.
Cleaning & maintenance schedule
Daily
- Check water and air temperature; feed according to species.
Weekly
- Change 20–30% of the water with dechlorinated water.
- Rinse filter sponge in old tank water (never tap water) as needed.
Monthly
- Top up leaf litter on land; prune plants at the waterline.
Yearly
- Service the pump/filter fully.
Recommended for a black-knobbed map turtle bioactive
Quantities are for one minimum-size enclosure (150 × 60 × 60 cm).
Clay Bio Balls
Drainage layer, 4 cm
Jurassic ABG Terrarium Mix
Bioactive soil layer, 8 cm
Almond Leaves Dried 15/Pack
Leaf litter – food and cover for the clean-up crew
Fresh Sphagnum Moss Container
Moss for humidity pockets and planting
Malaysian Drift Wood
Bridges water and land; easy exit from the water
Cork Bark Flats
Shelter on the land section
Black-knobbed map turtle FAQ
Is the black-knobbed map turtle good for beginners?
The black-knobbed map turtle is best for keepers with some experience (intermediate). Shy; avoid handling.
What size enclosure does a black-knobbed map turtle need?
At least 150 × 60 × 60 cm (about 59 × 24 × 24 inches, roughly 143 US gallons) for one adult. Best kept alone.
How much does a black-knobbed map turtle cost in Canada?
Typically $100–250 CAD to buy, about $970–1770 CAD for a complete bioactive enclosure, and $300–550 CAD a year to keep.
What temperature and humidity does a black-knobbed map turtle need?
Temperature: Water 24–26°C, basking 30–35°C. Humidity: Not critical (aquatic).
What does a black-knobbed map turtle eat?
Omnivore – pellets, insects, snails, aquatic plants. Feed adults every 1–2 days.
Similar species
This care sheet is general guidance from One Bioactive, not veterinary advice. Needs vary with age, locality and individual animals – confirm with your breeder and an exotics vet. Prices are typical Canadian ranges in CAD and change over time.