Nekton

Question 1

What cephalopods have an external shell

Answer 1

Nautilus

Question 2

How many arms and tentacles does a squid have

Answer 2

2 tentacles and 8 arms

Question 3

Name an example of a jawless fish

Answer 3

Hagfish

Lampreys

Question 4

How is extra buoyancy provided in sharks

Answer 4

Lots of fat/oil in the liver (liver can make up 25% of body volume)

Question 5

What organs do cartilaginous fish use to detect prey by using weak electrical fields

Answer 5

Ampullae of Lorenzini

Question 6

What is the purpose of the lateral line in fish

Answer 6

To detect vibrations

Question 7

What is countershading in epipelagic fish used for

Answer 7

Concealing themselves from predators and prey

Question 8

What body features to fish that specialise in acceleration have

Answer 8

A strong caudal fin and a deep body

Question 9

Features of a cursing specialist eg tuna

Answer 9

Fusiform and streamlined shape

Helps it speed through the water column

Question 10

Features of a manoeuvring specialist

Answer 10

Flattened
Vertically wide and big
Lots of contact with the water column, helping it make tight turns to escape predators

Question 11

Features of an acceleration specialist

Answer 11

Thicker causal section

Helping them gain speed quickly

Question 12

2 typical types of migration fish

Answer 12

Anadromous - feed and grow at sea and reproduce in freshwater
Catadromous fish - feed and grow in freshwater and reproduce at sea