Stingrays eat worms, mollusks, and other invertebrates, sometimes badly damaging valuable shellfish beds. This habit makes them easy to accidentally step on, and the sting they deliver in defense has made stingrays famous. Reportedly there has been an increase in the aquarium trade of fishes in the subfamily Potamotrygoninae as well.
Although some rays can produce an electric shock to defend themselves or stun prey, members of the family Dasyatidae cannot. This advanced system of nourishing young inside the uterus can produce offspring that are relatively large at birth (see Development). The serrated, barbed spine not only delivers venom, but also creates a deep wound often worsened by the thrashing of the ray.
From the side the ray is relatively flat, and the head is even with the body. Like other rays, stingrays have a spiral valve in their intestine that increases food absorption, and lack a swim bladder. Stingrays Don’t Use Their Eyes When Hunting A stingray’s eyes are located on its dorsal side. A la carte for stingrays are small fish and squid.
Aquatic Biomes: pelagic ; benthic ; reef ; lakes and ponds; rivers and streams; coastal ; brackish water, Other Habitat Features: estuarine ; intertidal or littoral. Stingrays use their poisonous barbs for protection, and this poison has also been used by humans. Freshwater stingrays have a powerful jaw due to its being cartilaginous. The whiptail stingrays are a family, the Dasyatidae, of rays in the order Myliobatiformes. Most species with at least 1 long venomous spine on tail, which can cause excruciating pain to humans. Chondroiten, used as skin replacement for burn victims, is derived from the fishes’ cartilage. Diet of the Stingray Most stingrays feed on small bottom-dwelling fish, clams, mussels, worms, crabs, lobsters, and other benthic organisms. After such extended nurturing inside their mothers’ bodies, young rays come into the sea quite able to feed and fend for themselves (see Development and Reproduction). The placement of Megatrygon within the family is provisional pending further research, as evidence suggests it may be more closely related to the families Potamotrygonidae and Urotrygonidae than to other dasyatids. Gestation may take up to 12 months. Stingrays are large cartilaginous fish found in warm coastal waters. The tail is usually longer than the disc and bears one or more long, serrated spines behind the pelvic fins.
In some groups the epithelium, or wall, of the uterus has evolved to form trophonemata, elongated villi that extend into the uterine cavity to provide greater surface area for respiratory exchange and histotroph excretion. Stingrays have small to medium-sized teeth that do not form flat crushing plates. Other extracts from cartilage help suppress tumors and may assist cancer treatment. Like other rays, they have enlarged pectoral fins that form a disc. Deepwater stingrays eat mostly boney fish and crustaceans, and they have an oval-shaped pectoral disc … At birth the ray is fully developed and looks like a small adult.
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