Just like their relatives Sharks and marine Rays, male freshwater stingrays have claspers, one on either side of the base of the tail and slightly underneath.
Husbandry and Breeding: These fishes are elasmobranches ("non-bony fishes") like sharks, marine rays, mantas and show an EXTREMELY clear sexual dimorphism, in which the mature males carry two claspers (along both sides of the tail).
The Males have claspers which come from underneath the stem of the tale. These get rather large and need to be before breeding will take place. Males normally around 15' and females slightly bigger.
Feeding tentacles with claspers attached to gonophores with developing eggs in some species.
Only visual difference is the males have two claspers extending from their anal fins. These are their sexual reproduction parts.
Breeding: ...
I can tell he is a male because of the 2 claspers and has no tank mates yet. I was considering one of the following: silver scats, monos, clown loaches, needle fish, gar, bichir, dolphin fish, or clown knife fish.
The male has two large claspers that are used to hang on to females when mating. They feed off of micro-organisms, but can be fed food commercially sold for them. Baby Brine Shrimp is newly hatched brine shimp less than 24 hours old.
organ to deliver sperm into the genital opening of the female, most notably the oviparous sharks, such as the horn shark, and oviparous rays, such as skates. In these cases, the male is equipped with a pair of modified pelvic fins known as claspers.
 See also: Fish, Water, Species, Catfish, Shark
  
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