Bluespotted Ribbontail Ray

The bluespotted ribbontail ray (Taeniura lymma) is a species of stingray in the family Dasyatidae. It can be found in the tropical 🇮🇳 Indian and western 🌊 Pacific Oceans, from the intertidal zone to a depth of 30m (100ft), in coral reef-associated habitats. This ray is relatively small, with a width not exceeding 35cm (14in). Its distinguishing features include a smooth, oval pectoral fin disc, large protruding eyes, and a short, thick tail with a deep fin fold underneath. The bluespotted ribbontail ray has a striking color pattern of blue spots on a yellowish background, with blue stripes on its tail.

During the night, groups of bluespotted ribbontail rays venture onto sandy flats to search for small benthic invertebrates and bony fishes. As the tide recedes, they retreat to shelters on the reef. Reproduction for this species is aplacental viviparous, with females giving birth to litters of up to seven young. While the venomous tail spines of this ray can potentially harm humans, it preferentially flees if threatened. Despite its beauty, the bluespotted ribbontail ray is difficult to care for in captivity.

Taxonomically, the bluespotted ribbontail ray was first described by Peter Forsskål in 1775. It belongs to the genus Taeniura, which was created by Johannes Peter Müller and Friedrich Gustav Jakob Henle in 1837. This ray is also known by various other common names. Morphological examination suggests that it is more closely related to certain amphi-American Himantura species and river stingrays than to the blotched fantail ray.

The bluespotted ribbontail ray is widely distributed in the nearshore waters of the tropical Indo-Pacific region. Its range extends from 🇿🇦 South Africa to Southeast Asia, including numerous islands and archipelagos. It is typically found in coral reefs, sandy flats, intertidal zones, tidal pools, and sometimes near seagrass beds. While it can occasionally be found deeper than 30m (100ft), it primarily inhabits shallower waters. Off the coast of 🇿🇦 South Africa, notable numbers of bluespotted ribbontail rays arrive every summer.

In terms of physical characteristics, the pectoral fin disc of the bluespotted ribbontail ray is oval in shape and around four-fifths as wide as it is long. It has large, protruding eyes followed by broad spiracles. The skin is generally smooth, with small thorns occasionally present on the back. The dorsal coloration is striking, with blue spots on a yellowish brown or green background, becoming smaller and denser towards the disc margin. The tail has two blue stripes running along each side. The eyes are bright yellow and the belly is white. This ray can grow up to 35cm (14in) in width, 80cm (31in) in length, and weigh up to 5kg (11lbs).

The bluespotted ribbontail ray is a common inhabitant of Indo-Pacific reefs. During the day, it tends to hide alone in caves or under coral ledges, with only its tail visible. At night, groups of rays gather and move onto shallow sandy flats to feed. Unlike other stingrays, it does not burrow itself in the sand. It excavates sand pits to locate and trap prey such as molluscs, worms, shrimps, crabs, and small benthic fishes. Other fishes, like goatfish, often follow these rays to scavenge for missed food. Breeding typically occurs from late spring to summer, with males following and nipping at female rays before copulation. The gestation period is estimated to be between four and twelve months, and females give birth to miniature versions of the adult ray. Known predators of the bluespotted ribbontail ray include hammerhead sharks, bottlenose dolphins, and other large fishes and marine mammals. This ray has been observed seeking cleanings from bluestreak cleaner wrasses.

While the bluespotted ribbontail ray is generally timid towards humans, it possesses venomous tail spines that can cause painful wounds. It is a popular choice among private aquarists due to its appearance, despite its unsuitability for captivity. Maintaining this species in an aquarium is often challenging, as it frequently refuses to eat or may inexplicably cease feeding. Public aquariums have had more success, and a breeding project is being conducted by the European Association of Zoos and Aquaria. The bluespotted ribbontail ray is also consumed as food in certain regions, and is caught using various methods. The species is listed as Least Concern by the International Union for Conservation of Nature (IUCN), but its coral reef habitats are continuously deteriorating due to development and destructive fishing practices. It is also heavily impacted by fishing and collection for the aquarium trade.