Fish endocrinology Flashcards Preview

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Flashcards in Fish endocrinology Deck (58)
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1

The hypothalamus can be referred to as what?

master regulator of hormones

2

The hypothalamus tells the brain when to _____ __ and communicates that to the ________.

wake up
pituitary

3

What is directly connected to the hypothalamus?

Pituitary gland

4

The pituitary gland is separated into what?

Anterior and posterior portions.

5

Is ACTH anterior or posterior?
What tissue does it act on?

Anterior
Kidney

6

Is TSH anterior or posterior?
What tissue does it act on?

Anterior
Thyroid

7

Is GTH anterior or posterior?
What tissue does it act on?

Anterior
Gonads

8

Is GH anterior or posterior.
What tissue does it act on?

Anterior
Acts on chloride cells and multiple tissues

9

Is PRL anterior or posterior?
What tissue does it act on?

Anterior
Osmoregulation

10

Is SL anterior or posterior.
What tissue does it act on?

anterior
plays a role in fat metabolism (adipocytes)

11

The hypothalamus is greatly affected by what?

Temperature, light availability and season

12

Is MCH anterior or posterior?
What tissue does it act on?

Posterior
Pigment cells

13

Is AVT anterior or posterior? What tissue does it act on?

Posterior
kidneys

14

Is isotocin anterior or posterior?
What tissue does it act on?

Posterior
osmorgulation

15

What is ACTH.
What does it do.

Adreno corocotropic hormone
ACTH tells the kidney to release cortisol.

16

What is cortisol?

Major stress hormone.
Also important in osmoregulation for making chloride cells.
(Important in growth effects)

17

The hypothalamus, through the anterior pituitary gland and ACTH thus regulates the _______ response, _________ and helps regulate _______.

stress
osmoregulation
growth

18

What is TSH?
What does it do?

Thyroid stimulating hormone.
Stimulates the thyroid to release thyroid hormone (different hormone) which is important in development and metamorphosis in fish.

19

What is GTH?
What does it do?

Gonadotropin hormone.
Tells the gonads to release stuff.
Controls the making of eggs.

20

What is GH?
What does it do?

Growth hormone.
Big effect on chloride cells, remaking them when moving into freshwater.
Helps with fish growth.

21

What is SL?
What does it do?

Plays a large role in fat metabolism.
During good times - store fat
During bad times - catabolize.

22

What is fat used for?

Make eggs or fight animals.

23

Both male and female fish will have __________ hormone, the effect will be different based on ____.

gonadotropin
sex

24

What is MCH?
What does it do?

Melanin concentrating hormone.
Concentrates melanin in pigment cells so the fish gets a darker colour.

25

Besides its use in colour, melanin causes something else. What is it?

Increases food intake.

26

What is the dual role of MCH?

Colour and food intake

27

______ controls changing colour for spawning.

MCH

28

What is AVT?
What does it do?

arginine vasotocin.
Largely controls water intake - similar to vasopressin.
Directly acts on kidney tubules and bladder.

29

When would AVT be secreted?

As migrating in habitats, teleosts want to change water balance in the kidneys.

30

What is isotocin?
What does it do?

In fish, isotocin is mostly used for osmoregulation, it affects salt balance in teleosts and osmobranchs.