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


fishes

tetrapods


Deepest fish abyssobrotula galatheae 8 370 meters puerto rico trench

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


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


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

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

Smallest fish: Trimmatomnanus(10 mm)


Longest fish: Regalecusglesne(11m)

Coldest fish: Cryodracoantarticus(-2° C)


Last”fish: Panderichthys

Synapomorphy= shared, derived trait

1) fin rays on lobed fin

2) operculum, suboperculum


“First” amphibian: Acanthostega

Synapomorphy= shared, derived trait

1) digits

2) lost operculum


fishes

tetrapods


escape, swimming

struggling





patch recording

electrical stimulus

motor root recordings

GFP-labeled glycinergic spinal interneurons

2. Is activity correlated with cell morphology?


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


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


Shared

Dedicated

  • Design of neural circuits

CoBL

CoLA

CoLO

struggling

escape

swimming + struggling


Whitfield et al. 1996

Hair cells in hearing

P2

P3

P4

P1

P5

P6

P7

P9

D2

D1

P8

OC1


neuro

afferent neurons

neuro

neuromast

lateral line ganglion neurons

afferent


posterior lateral line

P2

P3

P4

P1

P5

P6

P7

P9

D2

D1

P8

OC1

  • How does the LL encode hydrodynamic information?


120

100

80

60

velocity (mm/s)

40

*

20

0

0

1

2

3

4

5

6

7

pressure (psi)

Electrophysiology


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


neuro

transgenic GFP fish

neuro

HUC GFP

Autoneuron

Merge

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


Development using HUC Kaeda

Amina Kinkhabwala



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