Patchwork stingaree

Where they come from

Patchwork stingarees are Australian rays found on the continental shelf and slope off Western Australia. They sport that wild jigsaw pattern for a reason: they spend a lot of time half-buried on patchy sand and rubble in dim, cooler water.

Setting up their tank

Think floor space first. Rays don't care how tall the tank is. Aim for a footprint that lets it cruise without bumping rock or glass. A dedicated system is best.

• Substrate: fine, rounded sand (sugar-grain size). No crushed coral. Give them a few inches to bury.
• Aquascape: keep rock to the edges, lift it on supports so it can't topple. Leave a big open runway.
• Filtration: heavy-duty skimmer, big sump, and lots of biological media. Rays are messy eaters.
• Flow and gas exchange: moderate, broad flow with strong surface agitation. They like high oxygen but not sand-blasting currents.
• Lighting: dim to moderate. They are crepuscular and appreciate low glare.
• Lid: tight-fitting tops with blocked cord holes. Rays can surge up walls when startled.

Water quality has to be rock solid. Ammonia and nitrite at zero, nitrate kept low with regular water changes, pH in the normal marine range, and salinity stable. Rays react badly to swings.

What to feed them

They are ambush feeders that vacuum up benthic invertebrates. Getting a new stingaree to eat often means target feeding. I use long tweezers or a small feeding dish sunk into the sand so food doesn't drift.

• Primary: chopped raw shrimp/prawn, squid strips, scallop, clam, and mussel.
• Occasional: pieces of marine fish without bones or skin. Avoid oily fish.
• Training foods: fresh squid strip waved gently by the snout usually gets the first strike.

Juveniles: offer small portions daily. Adults: every other day is fine. Remove leftovers within a few minutes so they do not foul the sand.

How they behave and who they get along with

Patchwork stingarees are calm, methodical, and spend a lot of time buried with just eyes and spiracles showing. They are not social. Mine ignored midwater fish but was quick to defend its space if pestered.

• Usually OK: larger, peaceful midwater fish that do not dive-bomb the sand (e.g., anthias in cooler systems, some tangs if temperature-compatible).
• Risky: triggerfish, puffers, large wrasses, hogfish, and anything that nips or flips inverts. They harass rays and may damage the disk.
• Bottom competitors to avoid: goatfish, tilefish, other rays, or large burrowing eels. Too much stress and food competition.
• Inverts: most crabs and shrimp will be eaten. Urchins and stinging anemones can injure the disk.

Breeding tips

These rays are livebearers. Males have claspers; females do not. In home aquaria, breeding is extremely rare due to space, temperature, and availability. If you ever attempt a pair, you will need a very large footprint, stable chilled water, low stress, and a way to separate them if the male gets rough. Newborns are miniature copies and would need very small, frequent meals like finely cut mollusk and shrimp. Realistically, plan on keeping a single animal.

Common problems to watch for

• Refusing food: new arrivals often need quiet, low light, and motion-cued offerings. Try squid first, then rotate items. Check temperature.
• Skin abrasions: sharp substrate or rock does this. Keep sand ultra-fine and edges rounded. Treat secondaries with immaculate water, not harsh meds.
• Gill flukes: fast breathing, flashing, or lingering at the surface. Praziquantel baths are the safer route for rays.
• Metabolic issues: floppy disk edges or poor muscle tone from vitamin-poor diets. Use varied seafood and vitamin enrichment.
• Death curl: curling of the disk tips upward is a late stress sign. Check oxygen, temperature, nitrogen waste, and stop any aggressive tankmates immediately.
• Nitrate sensitivity: elevated nitrate can burn the disk over time. Keep it low with big, regular water changes and a hefty refugium or denitration plan.