 When searching for food , diamond stingrays may form groups of up to hundreds of individuals . It is most active at night and preys mainly on burrowing invertebrates and small bony fishes , which are extracted from the bottom via suction or digging . This species is aplacental viviparous : once the embryos exhaust their yolk supply , they are nourished by histotroph ( " uterine milk " ) produced by the mother . Females bear 1 – 4 pups every summer in estuaries ; mating is followed by a ten @-@ month period of either sperm storage or arrested embryonic development , after which the embryos rapidly mature over 2 – 3 months . The slowest @-@ growing stingray known , this species is not resilient against fishing pressure . It is caught for food by artisanal fishers in Latin America , particularly in Mexico where it is one of the most economically important rays . This has led it to be assessed as Near Threatened in Mexico by the International Union for Conservation of Nature ( IUCN ) , while the species as a whole is listed as Data Deficient . Though innocuous towards humans , the diamond stingray 's long , venomous tail spine is potentially dangerous . 
 When searching for food , diamond stingrays may form groups of up to hundreds of individuals . It <a href='drop_aux' title='1'><mark>is</mark></a>most active at night and <a href='uninflect' title='2'><mark>preys</mark></a> mainly on burrowing invertebrates and small bony fishes , which are extracted from the bottom via suction or digging . This species is aplacental viviparous : once the embryos exhaust their yolk supply , they are nourished by histotroph ( " uterine milk " ) produced by the mother . Females bear 1 – 4 pups every summer in estuaries ; mating is followed by a ten @-@ month period of either sperm storage or arrested embryonic development , after which the embryos rapidly mature over 2 – 3 months . The slowest @-@ growing stingray known , this species <a href='negative_concord' title='3'><mark>is</mark></a> <a href='negative_concord' title='4'><mark>not</mark></a>resilient against fishing pressure . It is caught for food by artisanal fishers in Latin America , particularly in Mexico where it <a href='drop_aux' title='5'><mark>is</mark></a>one of the most economically important rays . This <a href='been_done' title='6'><mark>has</mark></a> led it to be assessed as Near Threatened in Mexico by the International Union for Conservation of Nature ( IUCN ) , while the species as a whole is listed as Data Deficient . Though innocuous towards humans , the diamond stingray <a href='null_genetive' title='7'><mark>'s</mark></a>long , venomous tail spine <a href='drop_aux' title='8'><mark>is</mark></a>potentially dangerous . 
When searching for food , diamond stingrays may form groups of up to hundreds of individuals . It most active at nite and prey mainly on burrowing invertebrates and small bony fishes , which r extracted from the bottom via suction or digging . dis species is aplacental viviparous : once da embryos exhaust their yolk supply , they are nourished by histotroph ( " uterine milk " ) produced by the mother . Females bear 1 – 4 pups every summer in estuaries ; mating is followed by a ten @-@ month period of either sperm storage or arrested embryonic development , after which tdaembryos rapidly mature ova 2 – 3 months . Thdalowest @-@ growin stingray known , tdisspecies ain't resilient against fishing pressure . It is caught fa food by artisanal fishers in Latin America , particularly in Mexico where it one of thedast economically important rays . This done led it to be assessed as Near Threatened in Mexico by the International Union for Conservation of Nature ( IUCN ) , while the species as a whole is listed as Data Deficient . Though innocuous towards humans , the diamond stingray  long , venomous tail spine potentially dangerous .