Fish biology and anatomy (2)

Question 1

Fish Dissection

Answer 1

Lay fish on right side (To show all internal organs)

Open the body cavity with three cuts

A) 1st line originated from cranial to anus and run cranial till point ventral to operculum

B) 2nd line from the same point cranial to anus and run cranial through dorsum of body cavity till point dorsal to operculum

C) 3rd line connects the 1st line with 2nd line

Question 2

1st line

Answer 2

From cranial to anus and run cranial till point ventral to operculum

Question 3

2nd line

Answer 3

from the same point cranial to anus and run cranial through dorsum of body cavity till point dorsal to operculum

Question 4

3rd line

Answer 4

connects the 1st line with 2nd line

Question 5

Fusiform shape

Answer 5

Streamlined , oval body shape

Tuna

Typical fast swimming in open water

Question 6

Compressiform shape

Answer 6

Laterally compressed (flat from side to side)

Tilapia

Quick bursts of speed over short distances

Question 7

Depressiform shape

Answer 7

Flattened top to bottom

Sole fish , skates and rays

Flap fins up and down and swim like a bird

Question 8

Filliform shape

Answer 8

Snake like swimming movement

Pipefish , Sand eel

Their long body allow them to move into narrow opening and resist the force of water current

Question 9

Anguilliform shape

Answer 9

Snake like swimming movement

Eels

Their long body allow them to move into narrow opening and resist the force of water current

Question 10

FINS are supported by

Answer 10

Rays which are connected to musculoskeletal system

Question 11

Fin rays types

Answer 11

Soft
Flexible , jointed

Spine
Stiff , a jointed , mineralized

Question 12

Fins types “as numbers”

Answer 12

Paired fins
Pectoral , pelvic

Unpaired fins
Dorsal ,caudal and anal

Question 13

Dorsal fin

Answer 13

1. located on back of fish ,it supported with spines
2. Its use for rapid change of direction, stabilization and braking

Question 14

Single fin covering whole fish dorsum

Answer 14

Cichlidae family as Oreochromus niloticus

Question 15

Single small part fin of fish back

Answer 15

Cyprinidae family as Silver carp - Mirror carp

Question 16

Dorsal fin divided into 2 part

Answer 16

one is anterior (Spiny) and posterior (Soft) as Family Mugilidae (cephalus - capito)

Question 17

Salmon Dorsal fin

Answer 17

Dorsal fin is soft rayed & there are adipose flab near tail fin

Question 18

In catfish dorsal fin is

Answer 18

absent and is replaced by rayless adipose flab

Question 19

Caudal fin

Answer 19

1. Usually soft ray
2. Used for locomotion mainly (propelling of fish through water) Its shape vary with motion type used by different species

Question 20

Caudal fin shapes

Answer 20

Crescent or lunate
Forked
Round or truncated
Eel like shape

Question 21

Crescent or lunate

Answer 21

Very fast speed over very long distances

Tuna fish

Question 22

Forked “Caudal fin”

Answer 22

Fast speed over long distance

Mugilidae

Question 23

Round or truncated “Caudal fin”

Answer 23

Give quick burst (Fast swimming for short distance)

Guppy fish

Question 24

Eel like shape “Caudal fin”

Answer 24

Dorsal, Anal and Caudal fins fused with each other forming single fin for movement in narrow opening

Anguilla fish