Lecture 23

Question 1

What are the two classifications of jawed fish?

Answer 1

bony fish (teleosts)
cartilaginous fish (elasmobranchs)

Question 2

Do all fish require water to breed?

Answer 2

yes

Question 3

What are two examples of fish which change sex in response to social change?

Answer 3

anemonefish

swordfish

Question 4

What are two examples of fish which keep their temperature above ambient temperature?

Answer 4

tuna

white shark

Question 5

What is the term for temperature being dependent on the environment?

Answer 5

poikilotherms

Question 6

Can most fish be described as herbivores, omnivores or carnivores?

Answer 6

carnivores

Question 7

Are most fish neutrally buoyant or negatively buoyant?

Answer 7

neutrally buoyant

Question 8

What are four ways fish can swim?

Answer 8

vertically
on their side
inverted
in relation to the surface

Question 9

What is a Demersal species?

Answer 9

a species which lives in relation to an edge e.g. top/wall/bottom

Question 10

What is a Pelagic species?

Answer 10

an Oceanic species

Question 11

What is the predominant determinant of fish health?

Answer 11

water quality

Question 12

What are four features of water which is extremely important?

Answer 12

pH
hardness
expected chemicals
unexpected chemicals

Question 13

What are three examples of ‘expected chemicals’ found in water?

Answer 13

ammonia
nitrites
nitrates

Question 14

What happens to the partial pressure of oxygen when water temperature increases?

Answer 14

partial pressure of oxygen decreases

Question 15

What can rapid temperature change cause?

Answer 15

buoyancy

Question 16

Where is there the highest concentration of oxygen in a fish tank?

Answer 16

at air-water interfaces

Question 17

What disease can super saturation of nitrogen lead to?

Answer 17

gas bubble disease

Question 18

How can water movement lead to increased oxygen requirement in the water?

Answer 18

it can disturb sediment leading to increased decomposition of detritus

Question 19

What can stress lead to?

Answer 19

opportunistic infections

Question 20

What is a commensual of fish?

Answer 20

Aeromonas hydrophila

Question 21

What behaviour can fish show which are kept alone?

Answer 21

stereotypic behaviour

Question 22

What effect can increasing stocking density have on bullying?

Answer 22

decreases it

Question 23

What is ‘upside down goldfish’ usually caused by?

Answer 23

taking in gas

Question 24

Do ornamental lakes have filtration system?

Answer 24

no

Question 25

In what kind of housing are Koi fish often kept?

Answer 25

display ponds

Question 26

What problem does breeding traps avoid?

Answer 26

parental cannibalism

Question 27

What should transportation of fish involve?

Answer 27

double bagging in thick polythene bags in a rigid container

Question 28

What characteristic of gravel makes under gravel filtration a problem?

Answer 28

if the gravel is too fine

Question 29

What does UV filter assistance do?

Answer 29

stops algal bloom

Question 30

Is visual examination of water a good way to inspect water quality?

Answer 30

no

Question 31

What fish behaviour may suggest poor water quality?

Answer 31

gasping

Question 32

What are two things found in tap water which may be a problem for fish?

Answer 32

chloring | antiparasitics

Question 33

What is the problem with live plants in fish tanks?

Answer 33

they often die back and cause increased biological oxygen demand

Question 34

What is flaked fish food often lacking in?

Answer 34

roughage

Question 35

What is a problem with ponds being too shallow?

Answer 35

does not give enough space for overwintering fish to avoid the ice when the pond freezes over

Question 36

Why are larger ponds better than small ponds with regards to heat?

Answer 36

better thermal buffering capacity

Question 37

How can water depth affect reproduction?

Answer 37

decrease in water depth can trigger spawning

Question 38

Can fish can sunburn?

Answer 38

yes

Question 39

Why should fish tanks be placed out of direct sunlight?

Answer 39

because it encourages agal growth

Question 40

What is the problem with mixing fish and non-fish?

Answer 40

if the non-fish die they can reduce the oxygen in the tank

Question 41

How can tap water be treated to reduce the chlorine?

Answer 41

leaving the tap water overnight

Question 42

What substance in the tank causes new tank disease?

Answer 42

nitrites

Question 43

What should the level of nitrites in tank water be?

Answer 43

zero

Question 44

What kind of water makes testing for nitrites less effective?

Answer 44

hard water