Fish biology and anatomy (1)

Question 1

Fish

Answer 1

It is cold blooded (Ectotherm - poikilotherm) aquatic animal (can’t regulate its own temperature but it depends on temperature of surrounding) because it don’t have temperature regulatory center in hypothalamus , covered with scales

Question 2

…. haven’t scales

Answer 2

Cat fish

Question 3

Character of fish

Answer 3

1. Presence of gills (breathing organ) - all fishes must have it
2. Presence of scales on body
3. Presence of fins
4. presence of lateral line for sensation

Question 4

Dolphin has ….

Answer 4

no gills because it is from mammals

Question 5

Difference between Fish & Fishes

Answer 5

Fish :
group of fish from single fish species

Fishes :
group of fish from different fish species

Question 6

Operculum

Answer 6

Gill cover protecting gills

Question 7

Teleosti types

Answer 7

Soft rayed (Lower Teleosts)
Spiny rayed (Higher Teleosts)

Question 8

Soft rayed Fins

Answer 8

supported by soft rays (easily movable, jointed bone)

Question 9

Spiny rayed fins

Answer 9

Some fins supported with bony spine (a jointed, Mineralized bone)

Question 10

Soft rayed scales

Answer 10

Have Cycloid scales (smooth Cd. border)

Question 11

Spiny rayes scales

Answer 11

Have Ctenoid scales (toothlike extensions on Cd. border)

Question 12

More advanced

Answer 12

Spiny rayed

Question 13

Soft rayed swim bladder

Answer 13

Have Physostomous swim bladder (Connected to esophagus)

Question 14

Spiny rayed swim bladder

Answer 14

Have Physoclistous swim bladder (no connection to esophagus)

Question 15

Soft rayed pelvic fin

Answer 15

Abdominal - Sub abdominal

Question 16

Spiny rayed pelvic fin

Answer 16

Thoracic – Jugular

Question 17

Physostomous Swim bladder

Answer 17

Connected to esophagus by pneumatic duct

Soft rayed fishes

Fish open its mouth and the air goes to esophagus then to swim bladder

Question 18

Physoclistous Swim bladder

Answer 18

No connection to esophagus

Spiny rayed fishes

Blood vessels that surround the swim bladder exchange air with it (Diffusion)

Question 19

Why Swim bladder lies below vertebral column?

Answer 19

When swim bladder filled with air the density of fish will decrease so the fish will go up End to get down the fish must empty swim blood

Question 20

Abdominal Pelvic fin

Answer 20

Near to anal fin

Question 21

Sub abdominal Pelvic fin

Answer 21

In the mid space between anal and pectoral fin

Question 22

Thoracic Pelvic fin

Answer 22

Below the pectoral fin

Question 23

jugular Pelvic fin

Answer 23

In front of the pectoral fin

Question 24

Why we study fish morphology?

Answer 24

1. Where the fish lives ? (Water column) → To make polyculture
2. How the fish eats ?