Spotted metynnis
Metynnis maculatus
Also known as Spotted silver dollar, Spotted dollar, Maculatus silver dollar
Care at a glance
- Temperature
- 73–82°F (23–28°C)
- pH
- 5.5–7.5
- Adult size
- 7.1 in (18 cm)
- Minimum tank
- 92 gal (350 L)
- Temperament
- Peaceful
- Social behavior
- Schooling
- Swim level
- Middle
- Difficulty
- Easy
- Breeding
- Hard
- Rarity
- Common
- Origin
- Native to the Amazon and Paraguay river basins in South America.
- Family
- Serrasalmidae
Overview
This larger silver dollar needs a shoal of at least 5 and a big, tall tank with open swimming space. It is peaceful with medium and large tankmates but will eat live plants down to the stumps, so use hardy or artificial plants. Give it a secure lid and clean, warm water.
In the wild
Lives in slow rivers, backwaters, and flooded areas, often among submerged branches and plants. It forages through vegetation for leaves, fruit, and soft plant matter. It moves in shoals through the middle water.
Good to know
Metynnis maculatus is a disc shaped, silver relative of the piranhas that reaches around 18 cm, larger than most silver dollars. Its body is scattered with irregular dark spots and blotches. Despite the family, it is a dedicated plant eater.
Did you know
It is one of the bigger silver dollars, and a settled group of these round, coin bright fish moving together makes a striking display in a large tank.
Where to buy
Some links may not be the exact species or variety.
…or ask your local fish store.
Appears in
Freshwater fish · Beginner fish · Schooling fish · Community fish
Keeping Spotted metynnis?
Track water tests, reminders and stocking fit.
Related species

Spotted silver dollar
Metynnis lippincottianus5.5 in (14 cm)53 gal (200 L)73–81°F (23–27°C)
Redhook
Myloplus rubripinnis9.8 in (25 cm)70 gal (265 L)73–81°F (23–27°C)
Wimple piranha
Catoprion mento5.9 in (15 cm)53 gal (200 L)75–82°F (24–28°C)
Disk tetra
Myleus schomburgkii15.7 in (40 cm)170 gal (645 L)73–81°F (23–27°C)
Tiger pacu
Acnodon normani5.1 in (13 cm)46 gal (175 L)72–82°F (22–28°C)
Red-bellied Piranha
Pygocentrus nattereri12.6 in (32 cm)160 gal (605 L)75–82°F (24–28°C)