Lecture 9 Chemoreception and other senses

Question 1

What is olfaction?

Answer 1

Smell

Question 2

Role of Olfaction (4)

Answer 2

Feeding
Navigation
Reproduction
Predator Avoidance (fright reaction)

Question 3

general structure of Olfaction (3)

Answer 3

external nares irrigate olfactory rosette
rosette bears receptor cells
most fish have no connection to oral cavity=No respiratory function

Question 4

Nares (3)

Answer 4

most fish have 2 pairsof nares (anterior & posterior)
some have lost posterior nare
some have anterior & posterior nares coalesced

Question 5

what is gustration

Answer 5

taste

Question 6

taste buds (3)

Answer 6

-receptor is the taste bud

-located in epithelium of the
mouth, pharyngeal region, gill arches

-also externally in some spp. on barbels, fin rays and body surface
commonly on lips and head of bottom feeders

Question 7

role of taste (3)

Answer 7

important to initiate feeding behavior (stimulus)

external gustation important for location of food

mating for fish that use mouth during courtship