ThatQuiz Test Library Take this test now
How to Identify and Classify Discus Fishes
Contributed by: Wallis
  • 1. What is the scientific name for Discus fish?
A) Symphysodon
B) Pterophyllum
C) Betta
D) Poecilia
  • 2. What is the defining characteristic of a Discus's body shape?
A) Laterally compressed and round
B) Dorsally flattened
C) Square and box-like
D) Elongated and cylindrical
  • 3. How many vertical bars do wild-type Discus typically display?
A) Nine
B) Five
C) Seven
D) Eleven
  • 4. Which species is considered the 'Heckel' Discus?
A) Symphysodon heckel
B) Symphysodon aequifasciatus
C) Symphysodon discus
D) Symphysodon tarzoo
  • 5. Which species is often referred to as the 'Blue' or 'Brown' Discus?
A) Symphysodon discus
B) Symphysodon tarzoo
C) Symphysodon aequifasciatus
D) Symphysodon heckel
  • 6. What is the 'Pigeon Blood' Discus known for?
A) Bright green fins
B) Pepper-like speckling
C) Solid blue color
D) Intense red stripes
  • 7. Which color variation is associated with the 'Red Melon' Discus?
A) Solid red or orange body
B) Blue and black stripes
C) White with black spots
D) Yellow and green markings
  • 8. What is a key indicator of a healthy Discus?
A) Cloudy eyes and lethargy
B) Bright eyes and alert behavior
C) Rapid breathing at the surface
D) Fin clamping and hiding
  • 9. What fin is the most important to examine to confirm a Discus species and morph?
A) Dorsal fin
B) Caudal Fin
C) Anal Fin
D) Pectoral Fin
  • 10. What does 'F1' mean when describing Discus?
A) Fish with one fin
B) Fully grown, type 1
C) First generation offspring of wild-caught parents
D) Fish food grade 1
  • 11. What is generally the best pH range for keeping Discus?
A) 6.0-7.0
B) 7.5-8.5
C) 5.0-6.0
D) 8.5-9.5
  • 12. What temperature range is ideal for Discus?
A) 72-78°F (22-26°C)
B) 68-72°F (20-22°C)
C) 90-94°F (32-34°C)
D) 82-88°F (28-31°C)
  • 13. What is a common sign of stress in Discus fish?
A) Increased appetite
B) Aggressive behavior
C) Darkening of color
D) Vibrant color enhancement
  • 14. Which food type is essential for Discus health and color?
A) Low-protein foods
B) High-protein foods
C) Algae wafers
D) Plant-based flakes
  • 15. What type of water change is generally recommended for Discus?
A) Daily, complete water changes
B) No water changes required
C) Frequent, small water changes
D) Infrequent, large water changes
  • 16. What does 'Turquoise' often refer to in Discus?
A) Red patches
B) Green fins
C) Blue striations
D) Yellow bodies
  • 17. What anatomical difference helps distinguish *S. heckel* from other *Symphysodon*?
A) Prominent middle bar
B) Lack of bars
C) Smaller eyes
D) Larger fins
  • 18. What is the typical social behavior of Discus?
A) They are schooling fish
B) They are highly territorial
C) They are solitary fish
D) They are nocturnal
  • 19. What is the function of the slime coat on a Discus?
A) Helps with buoyancy
B) Attracts mates
C) Aids in digestion
D) Protects against parasites and infections
  • 20. What is a 'Checkerboard' Discus?
A) Discus with a pattern resembling a checkerboard
B) A Discus with only red fins
C) A Discus that only eats flake food
D) A Discus with damaged scales
  • 21. Which of these is NOT a common Discus disease?
A) Hexamita (Hole in the Head)
B) Swim Bladder Disorder
C) Ichthyophthirius multifiliis (Ich)
D) Gill Flukes
  • 22. What is the primary way Discus parents feed their fry?
A) Regurgitate food
B) Secrete slime from their bodies
C) Lay eggs for the fry to eat
D) Hunt for small invertebrates
  • 23. What do the eyes of an unhappy or unwell discus look like?
A) Cloudy and recessed
B) Bright and Active
C) Black and shrunken
D) Red and swollen
  • 24. Why is driftwood or peat often used in Discus tanks?
A) To oxygenate the water
B) To raise the pH and add minerals
C) To lower the pH and add tannins
D) To provide hiding places
  • 25. What is a potential danger of keeping Discus with other fish?
A) Increased oxygen levels
B) Improved water quality
C) Transmission of diseases
D) Reduced aggression
  • 26. What is 'peppering' referring to on Discus?
A) Fungal infections
B) Small black dots/speckles
C) Parasites on the scales
D) Large red spots
  • 27. The 'Leopard' Discus typically displays which pattern?
A) Scaleless body
B) Solid dark color
C) Vertical stripes only
D) Spots and patterns resembling a leopard
  • 28. How do you differentiate male and female Discus fish externally?
A) Males are larger
B) Females have brighter colors
C) Males have longer fins
D) Difficult to distinguish externally
  • 29. What is the importance of water hardness (GH) for Discus?
A) Soft water is preferred
B) Water hardness is not important
C) Hard water is preferred
D) Extremely hard water is needed
  • 30. What type of filtration is most important for a Discus tank?
A) Biological filtration
B) Mechanical filtration
C) Chemical filtration
D) No filtration is needed
Created with That Quiz — where a math practice test is always one click away.