Question

Which of the following explains correctly that salmon return to their specific home stream to spawn?

• A. Pheromones
• B. A Reflex
• C. Imprinting
• D. Classical conditioning
• E. Circadian rhythms

Answer 1

Answer: (C)

Imprinting

Imprinting is defined as a learning process in which an offspring establishes species specific behaviour patterns along with recognition and attraction towards individuals of own species and even certain specific individuals (like parents). This process is classified as phase sensitive learning independent of external behaviour or other characteristics. In case of salmons, it has been theorized by Wisby and Hasler that they imprint on the unique odour of the natal water and as adults follow the same odour cues to their birth homes for spawning. Hence the correct answer is 'Imprinting'.