• classic olfaction work
• bag of rocks vs bag of bait
• sharks with plugged nose didnt know the difference
• unplugged had success

largest part of shark brain

• can detect 1 part blood in 25 million parts

chemotaxis

(kilnotaxis)

behavior in response to attractive odor

ex: prey, conspecifics, mates

• lined with sensitive membranes
• folded series of ridges lined with cilia for olfaction

smell carrying substance

• dissolves in mucus and stimulates cilia
• olfaction nerves send signal to brain

1. arousal
2. direct approach
3. attack
4. if not found, search continues

mates will find and follow females

• directly beneath vent
• sometimes for hours