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How to Identify and Classify Danios - Test
Contributed by: Wallis
  • 1. Which fin is NOT typically used for identifying Danio species?
A) Dorsal fin
B) Anal fin
C) Caudal fin
D) Adipose fin
  • 2. What body shape is most common among Danio species?
A) Eel-shaped
B) Disk-shaped
C) Torpedo-shaped
D) Globular
  • 3. What is the primary diet of most Danios in the wild?
A) Algae
B) Plant roots
C) Insects and invertebrates
D) Detritus
  • 4. What type of water parameters do Danios generally prefer?
A) Very acidic
B) Slightly acidic to neutral
C) Highly alkaline
D) Brackish
  • 5. Which Danio species is known for its bright horizontal stripes?
A) Zebra Danio (Danio rerio)
B) Giant Danio (Devario aequipinnulus)
C) Glowlight Danio (Danio choprai)
D) Pearl Danio (Danio albolineatus)
  • 6. The term 'Devario' refers to what?
A) A disease affecting Danios
B) A related genus of larger Danios
C) A specific fin pattern
D) A type of Danio food
  • 7. What is the typical size range for most Danio species?
A) 1 foot or more
B) 5-7 inches
C) 1-3 inches
D) 8-10 inches
  • 8. What behavior is common among Danio species?
A) Nocturnal hunting
B) Solitary bottom-dwelling
C) Active schooling
D) Aggressive territoriality
  • 9. Which feature is LEAST helpful in identifying a Danio?
A) Fin ray count
B) Scale size
C) Color pattern
D) Body shape
  • 10. What is the general region of origin for most Danio species?
A) Africa
B) Southeast Asia
C) South America
D) Australia
  • 11. Which Danio is known for its shimmering, iridescent scales?
A) Pearl Danio (Danio albolineatus)
B) Celestial Pearl Danio (Danio margaritatus)
C) Zebra Danio (Danio rerio)
D) Leopard Danio (Danio frankei)
  • 12. What does 'sexually dimorphic' mean?
A) They reproduce asexually
B) They can change their sex
C) They only reproduce in groups
D) Males and females have different appearances
  • 13. How do you typically tell male and female Danios apart?
A) Males have longer fins
B) Females have brighter colors
C) Females are usually rounder
D) Males are always larger
  • 14. Which of these is NOT a common color seen in Danios?
A) Gold
B) Purple
C) Silver
D) Blue
  • 15. The Celestial Pearl Danio (Danio margaritatus) is also known as:
A) Emerald Tetra
B) Galaxy Rasbora
C) Diamond Guppy
D) Ruby Barb
  • 16. What type of spawning behavior is typical for Danios?
A) Livebearers
B) Mouthbrooders
C) Egg scatterers
D) Nest builders
  • 17. What is a good tank size for a small school of Danios?
A) 10 gallons
B) 2 gallons
C) 50 gallons
D) 5 gallons
  • 18. What type of current do Danios prefer in their tank?
A) Moderate current
B) Stagnant water
C) Very strong current
D) No current
  • 19. Which Danio species can grow to be quite large, reaching up to 4 inches?
A) Zebra Danio (Danio rerio)
B) Giant Danio (Devario aequipinnulus)
C) Glowlight Danio (Danio choprai)
D) Spotted Danio (Danio nigrofasciatus)
  • 20. What is the scientific name for the Glowlight Danio?
A) Danio albolineatus
B) Danio margaritatus
C) Danio choprai
D) Danio rerio
  • 21. Which fin is the most important for propulsion in Danios?
A) Anal fin
B) Caudal fin
C) Dorsal fin
D) Pectoral fin
  • 22. What is a common symptom of illness in Danios?
A) Increased appetite
B) Increased activity
C) Clamped fins
D) Brighter colors
  • 23. What does the term 'shoaling' refer to?
A) Aggressively defending a territory
B) Hiding amongst plants
C) Swimming together in a loose group
D) Laying eggs
  • 24. Which of these is a common behavior exhibited by Danios?
A) Building bubble nests
B) Hunting larger fish
C) Playing in the filter current
D) Burying themselves in the substrate
  • 25. Which of these tankmates is NOT generally suitable for Danios?
A) Aggressive, fin-nipping species
B) Peaceful rasboras
C) Small tetras
D) Corydoras catfish
  • 26. What is a good indicator of water quality in a Danio tank?
A) High ammonia levels
B) Clear water and stable parameters
C) Cloudy water
D) A strong fishy odor
  • 27. How often should you perform water changes in a Danio tank?
A) Only when the water is visibly dirty
B) Weekly or bi-weekly
C) Monthly
D) Every six months
  • 28. What is the approximate lifespan of a well-cared for Danio?
A) 6-8 years
B) 10+ years
C) 3-5 years
D) 1-2 years
  • 29. What food form is best for Danios?
A) Vegetable matter only
B) Live goldfish
C) Large sinking pellets
D) Small flakes or pellets
  • 30. Which Danio species has vertical bars instead of horizontal stripes?
A) Giant Danio (Devario aequipinnulus)
B) Spotted Danio (Danio nigrofasciatus)
C) Zebra Danio (Danio rerio)
D) Pearl Danio (Danio albolineatus)
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