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Which fish is known for returning to its birthplace to spawn after migrating from freshwater to the ocean?
Answer
Salmon
What substance lets African lungfish survive drought by forming a protective cocoon?
Answer
Mucus
Where do European eels migrate to spawn after spending years in rivers and coastal waters?
Answer
Sargasso Sea
The goldfish is a domesticated form of which wild carp species?
Answer
Prussian carp
Koi are domesticated varieties of which common freshwater fish?
Answer
Common carp
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The goldfish is a domesticated form of which wild carp species?
Answer
Prussian carp
Koi are domesticated varieties of which common freshwater fish?
Answer
Common carp
Which freshwater fish can move over land for short distances using its pectoral fins?
Answer
Walking catfish
What organ do arapaima use as a lung to breathe air at the water's surface?
Answer
Modified swim bladder
Which freshwater fish is famous for reaching more than 3 metres in length in the Mekong River basin?
Answer
Mekong giant catfish
Which fish is widely recognized as the world's largest freshwater fish by weight?
Answer
Giant freshwater stingray
Which freshwater fish species produces the highest measured electric discharge, reaching about 860 volts?
Answer
Electrophorus voltai
Which parrot species became famous for imitating human speech in Alex’s language studies?
Answer
African grey parrot