Overview
The Common Goldfish (Carassius auratus) is a beginner freshwater species known for its orange-gold (also red, white) coloration. Long-lived. Mid to Bottom.
Origin & Appearance
Origin: China.
Colors: Orange-Gold (also Red, White).
Body Shape: Deep Fusiform (oval/robust). Typical adult dimensions: 30.0 x 6.0 x 12.0.
Sexual Dimorphism: Subtle; males develop breeding tubercles in spring.
Tank & Water Requirements
| Min Tank Size | 40 gallons |
| Temperature | 50–75°F |
| pH Range | 7–8 |
| Water Hardness (GH) | 8-20 |
| Bioload | high |
| Oxygen Demand | medium |
| Plant Safe | mostly |
| Aquarium Position | Mid to Bottom |
Behavior & Activity
Active mid-level swimmer; steady smooth cruising with gentle tail beats; forages through substrate; long endurance swimmer
Speed: 45/100Aggression: 2/10diurnalSchooling (2+)
Breeding
Moderate; egg scatterer; needs cold period
Common Diseases
💊 Ich
Expert Notes
Long-lived; needs large tank or pond