FISH!!

Question 1

three examples of infectious contaminants of shellfish

Answer 1

Hepatitis A
cholera
Vibrio parahaemolyticus

Question 2

name diseases associated with bodies of water

Answer 2

swimmers itch
river blindness
falariasis
malaria

Question 3

name some non infectious contaminants of water

Answer 3

heavy metals
herbicides
pesticides

Question 4

whats a tape worm that can be acquired from fish

Answer 4

diphylobothrium latum

Question 5

what bacteria can be contracted from handling fish

Answer 5

mycobacteriosis

Question 6

what causes an IgE dependant hypersensitivity. also known as sea food allergy

Answer 6

Anidskids

live or dead worms can cause this

Question 7

name types of aquaculture

Answer 7

sea water cages
fresh water cages
tanks

Question 8

list the phases of salmon life cycle from egg to adult (6 stages)

Answer 8

egg
alevin
fry
parr
smolt
salmon

Question 9

what features of a fish make it spoil faster

Answer 9

small size
high ph
fatty species
thin skin

Question 10

what are the three forms of decomposition

Answer 10

enzymatic
oxidative
bacterial

Question 11

what are three spoilage indicators

Answer 11

changes in colour
changes in texture
odour

Question 12

what is enzymatic spoilage

Answer 12

protein degredation by enzymes

Question 13

what is oxidative spoilage

Answer 13

conversion of triglycerides into ketones and aldehydes

rancid

Question 14

what causes the offensive odour

Answer 14

trimethylamine

Question 15

what are the 4 phases of fish spoilage

Answer 15

phase 1: 0-5 days
phase 2: 5-10 days
phase 3: 10-14 days
phase 4: 14 days<

(phase 1/2 are enzymatic, phase 3/4 are bacterial)

Question 16

what to do when assessing fish quality/freshness

Answer 16

appearance of eyes, gills and skin
odour of the gills and cavity
discolouration
presence/absence of rigor mortis

Question 17

what are the three categories of fresh fish

Answer 17

cat 1=FRESH AF
cat 2=less fresh, still fit for consumption
cat 3=spoiled, not fit for human consumption

Question 18

what would a fresh and spoiled fish look like

Answer 18

FRESH
clear cornea 
bright pink gills with clear mucus
clear and bright skin
fresh, seaweed or metallic odour

SPOILED
milky cornea
discoloured brown gills with opaque mucus
discoloured yellow sticky skin
offensive smell

Question 19

how would you euthanise a fish

Answer 19

(tricaine methane sulphonate)

Question 20

What are some potential stressors for fish

Answer 20

high stock density
food withdrawl
human presence
light intensity
abrasions
reduced oxygen

Question 21

what are the two stunning methods for fish

Answer 21

wet stunning

dry stunning

Question 22

what are the indicators of an effective stun

Answer 22

fish becomes rigid
loss of balance
no rhythmic movement of opercula
absence of eye roll reflex
small involuntary twitches
no reaction to tail pinch

Question 23

how long after the stun should you cut and bleed (exsanguinate) the fish

Answer 23

ASAP

max 10-15 seconds after