Why ichthyology
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11:45-12:35 ZOO: 4926 August 25, 2011. Why Ichthyology?. Jimmy Liao ([email protected]). Outline. Diversity 32,000 species in FishBase Morphology, physiology, habitat “Simplicity” Accessibility. fishes. tetrapods.

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Why ichthyology

11:45-12:35

ZOO: 4926

August 25, 2011

Why Ichthyology?

Jimmy Liao ([email protected])


Outline

Outline

  • Diversity

    • 32,000 species in FishBase

    • Morphology, physiology, habitat

  • “Simplicity”

  • Accessibility


Why ichthyology

fishes

tetrapods


Deepest fish abyssobrotula galatheae 8 370 meters puerto rico trench

Deepest fish: Abyssobrotula galatheae 8,370 meters (Puerto Rico Trench)


Why ichthyology

Highest fish: Orestiascuvieri4,570 meters (Lake Titicaca, Andes)


Why ichthyology

Largest fish: saltwater =Rhincodontypus(95,000 lbs, 12.6 m, 40 feet)

freshwater = Husohuso(3m, 10 feet, 3250 lbs)

Smallest fish: Trimmatomnanus(10 mm)


Why ichthyology

Longest fish: Regalecusglesne(11m)

Coldest fish: Cryodracoantarticus(-2° C)


Why ichthyology

“Last”fish: Panderichthys

Synapomorphy= shared, derived trait

1) fin rays on lobed fin

2) operculum, suboperculum


Why ichthyology

“First” amphibian: Acanthostega

Synapomorphy= shared, derived trait

1) digits

2) lost operculum


Why ichthyology

fishes

tetrapods


Why ichthyology

escape, swimming

struggling


Why ichthyology

1 mm


Why ichthyology

1 mm


Why ichthyology

Hale et. al. 2001


Why ichthyology

  • What are the functions of different spinal neurons?

patch recording

electrical stimulus

motor root recordings

GFP-labeled glycinergic spinal interneurons

2. Is activity correlated with cell morphology?


Why ichthyology

motor behavior

n = 75

n = 23

e + sw (4)

sw (8)

neuronal activity

repertoire (%)

st (100)

(88)

sw + st

  • Design of neural circuits

CoBL

CoLA

struggling

swimming + struggling


Why ichthyology

n = 75

n = 23

n = 34

e + sw (4)

sw (8)

n (12)

repertoire (%)

st (100)

(88)

e (88)

sw + st

  • Design of neural circuits

CoBL

CoLA

CoLO

struggling

escape

swimming + struggling


Why ichthyology

Shared

Dedicated

  • Design of neural circuits

CoBL

CoLA

CoLO

struggling

escape

swimming + struggling


Why ichthyology

Whitfield et al. 1996

Hair cells in hearing

P2

P3

P4

P1

P5

P6

P7

P9

D2

D1

P8

OC1


Why ichthyology

neuro

afferent neurons

neuro

neuromast

lateral line ganglion neurons

afferent


Why ichthyology

posterior lateral line

P2

P3

P4

P1

P5

P6

P7

P9

D2

D1

P8

OC1

  • How does the LL encode hydrodynamic information?


Why ichthyology

120

100

80

60

velocity (mm/s)

40

*

20

0

0

1

2

3

4

5

6

7

pressure (psi)

Electrophysiology


Why ichthyology

120

100

80

60

velocity (mm/s)

40

*

20

0

0

1

2

3

4

5

6

7

pressure (psi)

motor root

20 mV

0.5 s

water jet

Electrophysiology

PLL neuron


Why ichthyology

neuro

transgenic GFP fish

neuro

HUC GFP

Autoneuron

Merge

44.8 ± 7.8 neurons for every 12 neuromasts( n= 7 animals)


Why ichthyology

Development using HUC Kaeda

Amina Kinkhabwala


Why ichthyology

Visualizing neural activity


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