Chemoreception: Migration

Question 1

What can decrease olfactory sensitivity?

Answer 1

• pollutants (pesticides)

Question 2

Give an example of a pesticide and its effects

Answer 2

• IPBC
• potential failure to detect natal stream for spawning = no reproduction

Question 3

What are the 6 reasons fish migrate?

Answer 3

• separation of life stages
• increased larval survival + finding proper habitat
• maximization of feeding/growth
• reduced intraspecific competition for resources
• better feeding grounds

Question 4

Why do fish migrate for separation of life stages?

Answer 4

• avoid cannibalism

Question 5

What are the 3 ways fish migrate?

Answer 5

• gradient cues
• celestial clues
• orientation to geomagnetic/geoelectric fields

Question 6

What are gradient cues?

Answer 6

• temp, salinity and chemicals

Question 7

What are celestial clues?

Answer 7

• orientation by position of sun

Question 8

What is important for geomagnetic and geoelectric fields?

Answer 8

• oceanic currents