Oscar (Astronotus ocellatus) is a intermediate-level freshwater fish that needs at least 75 gallons and 74-81°F. An intelligent, big, messy cichlid with a lot of personality. Needs a large tank and powerful filtration, and any fish that fits in its mouth will be eaten.
Care facts at a glance
| Scientific name | Astronotus ocellatus |
|---|---|
| Family | Cichlidae |
| Origin | Amazon basin, South America |
| Adult size | 12-14 in |
| Minimum tank | 75 gallons |
| Temperature | 74-81°F |
| pH | 6.0-8.0 |
| Temperament | Aggressive and predatory |
| Social behavior | Solitary or large mated pair |
| Swim level | All levels |
| Difficulty | Intermediate |
| Diet | Carnivore: pellets, frozen foods |
| Typical lifespan | 10-15 years |
Quick tips
- Heavy bioload: oversize the filter.
- Rearranges decor; secure heavy items.
- Tank mates must be large and tough.
San Diego water
Tolerates San Diego's hard, alkaline tap water (pH roughly 7.6-8.6) with slow acclimation and a conditioner that handles chloramine. Learn the numbers in our San Diego tap water guide.
Before you buy
Make sure your tank is cycled (how to cycle a tank), check your numbers with the water testing guide, and use the compatibility guide to check tankmates. These are general ranges; individual fish and local water vary.
Find it at Pet Zone
Pet Zone Tropical Fish is a San Diego aquarium store with two locations. Stock changes daily, so call ahead if you are after a specific species or plant. Shop online at petzonesd.com.
4160 Convoy St, San Diego, CA 92111
(858) 987-0309
Open daily, 10am-6pm
Aquascaping, planted tanks
4266 University Ave, San Diego, CA 92105
(619) 283-1812
Closed Monday; Tue-Fri 10:30am-6pm, Sat 11am-6pm, Sun 11am-4pm
Monster fish, koi