The Black Oranda Goldfish, scientifically known as Carassius auratus, belongs to the Cyprinidae family. Its genome is characteristic of goldfish, with specific traits like the prominent head growth or "wen." Evolutionarily, the goldfish lineage traces back thousands of years to ancient China, where they were selectively bred from crucian carp.

Summary on Aquatic Life:
The Black Oranda Goldfish is a captivating freshwater species, recognized for its distinctive black coloration and the unique hood-like growth on its head. These goldfish are social creatures that thrive in well-maintained aquariums with proper filtration and aeration. Their omnivorous diet includes a combination of high-quality flakes, pellets, and occasional treats like live or frozen food. Regular monitoring of water parameters, temperature, and maintaining appropriate tank size contribute to their overall well-being.

Requirements for a Happy and Healthy Living Environment:
- Adequate tank size (minimum 20 gallons per goldfish)
- Efficient filtration system
- Regular water testing and maintenance
- Appropriate water temperature (around 65-75°F or 18-24°C)
- Balanced diet with quality fish food
- Proper aeration for oxygenation
- Stimulating environment with hiding spots and decorations
- Avoid overcrowding and monitor social interactions
- Routine health checks for signs of illness
- Consistent monitoring of water quality parameters

Examples of Compatible Aquatic Life:
- Fish:
1. Comet Goldfish – Similar environmental requirements make them suitable tankmates.
2. White Cloud Mountain Minnows – Peaceful schooling fish that coexist well.
3. Corydoras Catfish – Bottom-dwelling species that complement goldfish.
4. Rosy Barb – Active and vibrant, adding diversity to the aquarium.
5. Weather Loach – Hardy and adaptable, thriving in similar conditions.

- Crustaceans:
1. Cherry Shrimp – Colorful and non-aggressive, ideal for clean-up.
2. Amano Shrimp – Effective algae eaters that cohabit peacefully.
3. Bamboo Shrimp – Filter feeders contributing to water quality.
4. Vampire Shrimp – Unique appearance and compatible with goldfish.
5. Malaysian Trumpet Snails – Assist in substrate maintenance.

- Bugs:
1. Water Beetle – Adds a natural dynamic to the tank.
2. Dragonfly Nymph – Interesting insect larva that thrives in aquatic environments.
3. Water Strider – Surface-dwelling insect that complements goldfish.
4. Mayfly Larva – Delicate insect stage suitable for larger aquariums.
5. Caddisfly Larva – Hardy and fascinating invertebrate.

- Plants:
1. Java Fern – Hardy and low-maintenance plant for aquascaping.
2. Anubias – Withstand goldfish nibbling, providing shelter.
3. Hornwort – Oxygenating plant contributing to water health.
4. Vallisneria – Tall grass-like plant offering hiding spots.
5. Amazon Sword – Robust and visually appealing addition.

- Amphibians:
1. African Dwarf Frog – Coexists peacefully with goldfish.
2. Fire-bellied Toad – Colorful amphibian suitable for larger tanks.
3. Oriental Fire-bellied Newt – Aquatic newt species compatible with goldfish.
4. Axolotl – Unique and fascinating amphibian companion.
5. Clawed Frog – Thrives in similar aquatic conditions.