Breeding the Silver Dollar (Metynnis Argenteus) is a bit difficult and requires planning. If you want the breeding to be, successful it is recommended that you purchase all of your pairs of silver dollars when they are juveniles so that they can get use to each other and basically grow up together this allows the fish to create a bond with one another.
You will also need to have a separate aquarium for breeding and a large aquarium 20 plus gallons for the fries to live in until they are sold or old enough to be placed in a community tanks(s) with older silver dollars. Silver dollars are calm and peaceful fish and do will in an aquarium with other calm fish besides their own species. Silver dollars are a schooling fish and thrive best in schools of six or more. They are mid dwellers and need tall plants and floating plants to provide food and a safe haven if they feel threatened.
The silver dollar is a large fish adults can grow up to a half a foot wide. While a juvenile, silver dollar is only the size of a dime. The silver dollar is easily recognizable by the small dots that cover their bodies and the wide rounded bodies. The males are easy to tell apart from the females, the males have a long anal fin that has a tint of red on it.
When the silver dollars are ready to breed, move them to the breeding aquarium. The aquarium should be dimly lit, the water hardness needs to be soft at about 8 dGH or lower and water temperature should range between 80 and 82 degrees F. Fine leafed plants should also be placed in the tank to serve as food and a soft landing spot for the eggs. Many species of fish build a nest of bubbles to act as a safety net the silver dollar does not so the plants will help protect them until they hatch.
The breeding process is one that the silver dollars allow nature to takes its course. The female will lay up to 2000 eggs the male will fertilize them. They are herbivores and will not eat the eggs so it is the breeder’s decision whether or not to return them to the community aquarium or leave them with the eggs. Most breeders return them to the community aquarium just too safe.
The eggs will hatch in two to three days they will attach themselves to a surface of the aquarium and eat the plankton for the first few days.