Discus vs Plecostomus
Symphysodon discus compared with Hypostomus plecostomus
Taxonomy & Classification
| Attribute | Discus | Plecostomus |
|---|---|---|
| Scientific Name | Symphysodon discus | Hypostomus plecostomus |
| Order | Cichliformes | Siluriformes |
| Family | Cichlidae | Loricariidae |
| Conservation Status | Least Concern | Least Concern |
Physical Traits
| Attribute | Discus | Plecostomus |
|---|---|---|
| Max Length | 20.0 cm | 50.0 cm |
| Max Weight | 0.25 kg | 1.0 kg |
| Color | Deep-bodied disc shape with vibrant turquoise-blue wavy horizontal lines over a reddish-brown to orange-brown base; fins edged in vivid blue with red striping; wild forms show 9 dark vertical bars. | Dark brown to grayish-black body densely covered with pale yellowish or cream spots and flecks creating a mottled leopard-like pattern; armor-plated scutes visible; belly is pale tan to cream. |
Habitat & Environment
| Attribute | Discus | Plecostomus |
|---|---|---|
| Water Type | Freshwater | Brackish |
| Depth Range | — | — |
| Geographic Range | Restricted to the central Amazon River basin in Brazil, particularly around the confluence of the Rio Negro and Rio Solimões. Prefers warm, soft, highly acidic … | Native to rivers and coastal streams of northeastern South America, from Guyana and Suriname through northern Brazil. Found in rocky river bottoms and estuarine margins; … |
| Habitat | Warm, blackwater rivers of the Amazon basin, particularly the Rio Negro and tributaries. Prefers soft, acidic water (pH 4.5-6.5, 26-31°C) with driftwood and minimal current. … | Rivers of the Amazon basin, especially the Rio Tapajós and Rio Orinoco. Inhabits clear-water rivers over gravel and rocks; also near submerged wood. Grazes algae … |
Aquarium Suitability
| Attribute | Discus | Plecostomus |
|---|---|---|
| Min Tank Size | 250 L | 280 L |
| Temperature | 26-30 | 22-28 |
| pH Range | 5.0-7.0 | 6.5-8.0 |
| Care Level | Difficult | Easy |
| Temperament | Peaceful | Peaceful |
Cuisine & Edibility
Discus
Not consumed — a prized ornamental aquarium fish known as the 'king of the aquarium' for its disc-shaped body and brilliant colors.
Plecostomus
Not consumed — ornamental algae-eating catfish kept as a natural tank cleaner; widely popular in freshwater aquariums for its armored body and bottom-dwelling habits.
Species Overview
Discus
The discus is often called the 'King of the Aquarium' for its disc-shaped body and stunning color patterns. Native to the Amazon floodplains, it requires warm, soft, acidic water and feeds its fry with a mucus secretion from its skin.
Plecostomus
The common pleco is a large armored catfish native to South America. Often purchased as an algae eater, it can outgrow most home aquariums. Its sucker-like mouth allows it to rasp algae from surfaces and anchor itself in fast-flowing currents.