Potamotrygon sp. "itaituba" · P14

Overview

Potamotrygon sp. 'Itaituba', commonly labeled P14, usually has small pale spots concentrated near the disc edge and extending beneath it. Its status as a geographic form of Potamotrygon leopoldi or a separate species remains unresolved. Retain the provisional name, number, and provenance rather than identifying it from spots alone.

Distribution & habitat

It is collected in Brazil's Tapajós. Itaituba refers to a city used in transport, not necessarily one precise collection site. Like relatives, it uses sandbars, river shallows, and slow sandy or muddy tributaries, with seasonal access to flooded forest and receding-water pools.

Aquarium setup

Allow at least about 210 × 90 × 60 cm for an adult or pair, preserving extensive open floor space. Use decoration sparingly; wood and smooth stones must be heavy or secured. Subdued light is suitable. Rooted plants may be eaten and attached plants may not persist.

River sand suits juveniles and permits burial when alarmed; a bare floor is easier to clean. Provide strong mature sump or external filtration for the waste load. Around four tank volumes per hour is a circulation reference, with surface movement for high oxygen levels.

Change about 50% weekly and prevent nitrogenous-waste accumulation. Isolate heaters to prevent resting-contact burns. Secure the lid against fish emerging at feeding time.

Diet & feeding

Related rays mainly eat fish and aquatic invertebrates. Offer varied animal foods at least twice daily. Juveniles take bloodworms, Tubifex, brine shrimp, and krill; larger fish need fish flesh, shellfish, whole shrimp, squid, and earthworms.

New arrivals may be thin and reluctant to accept frozen fare. Live bloodworms or suitably sized earthworms can restore feeding before conversion after improvement. Avoid beef heart, chicken, and other mammalian or bird meat. Routine feeder fish are unnecessary and risk introducing parasites or pathogens.

Behaviour & compatibility

Most small fish may become prey, while aggressive or territorial larger companions can also stress rays. Prefer large peaceful upper-water fish. Other large bottom dwellers require additional floor space.

Smaller fish such as discus have been taken at night, and large suckermouth catfish may damage the disc by attaching to it. Related rays can hybridize. Maintain separate breeding sources rather than presenting mixed offspring as unchanged wild forms.

Sexual dimorphism

Males have paired claspers projecting backward from the inner pelvic-fin margins. Smaller structures are visible in juveniles.

Breeding

Captive-born P14 pups have been observed. As in relatives, embryos initially use yolk and later receive uterine secretions before live birth. Pairing requires mutual acceptance, with a female larger than the male better able to withstand courtship.

Males chase, bite the disc, and move beneath the female. Prolonged unsuccessful pursuit can cause injury, so provide separation facilities. Fertilization is internal. General captive gestation in the genus is often nine to twelve weeks, with increased feeding needs during pregnancy.

Separate newborns for safety. If birth clouds the water, make a substantial change after moving pups. Yolk may support them for about a week, followed by several daily meals of quality live or frozen food. Mixed live foods can aid conversion. P14 pups are mottled brown and undergo pronounced pattern changes during their first twelve to eighteen months. Rest females away from males after two or three litters.

Notes

Typical spotting differs from Potamotrygon leopoldi, but underside or marginal spots do not by themselves establish hybrid ancestry. Manage P14 as a provisional group with documented origin.

Defensive spines remain hazardous when shed. Avoid petting or nets; use a solid container or large fish bag, and seek care after a sting. Persistent food refusal, hollows between the eyes, prominent tail-base structures, and curled margins are abnormal signs.