Fish Flashcards
Name the steps in fish processing
- Gutting and deheading
- Desliming
- Weighing
- Filleting
- Trimming
- Pinbone removal
- Skinning
- Fillet washing
- Grading
What is Clonorchis Sinensis? When is its infective stage?
A trematode
The infective stage is metacercaria, found in the muscle and subcut tissue
Where is Clonorchis Sinensis found in people?
Bile ducts
What is the most commn species of Diphyllobothrium spp. that infects humans?
D. Latum
Where is D. Latum found in humans?
The mucosa of the ileum and jejunum - treat with praziquantel
What is Mycobacterium marin?
A resistant bacteria found in ornamental fish - aquarists finger
Name the common bacteria associated with consuming bivalves
Salmonella spp Shigella spp. Vibrio parahaemolyticus Vibrio vulnificus Campylobacter spp. Listeria
What chemicals are associated with bivalves?
Heavy metals including mercury, cadmium and lead
What organics are associated with bivalves?
Dioxins, Polychlorinated Biphenyls, Polycyclic aromatic hydrocarbons (PAH’s) and pesticides
What are the two most significant species of vibrio in bivalves?
V. Vulnificus
V. Parahaemolyticus
How does v. Vulnificus infect?
Lives in warm seawater and can infect via open wounds eating raw oysters
What does v. parahaemolyticus cause?
Gastroenteritis, readily detected in Uk seafood
What does v. parahaemolyticus cause?
Gastroenteritis, readily detected in UK seafood
How do algal toxins infect people?
phytoplankton produce the toxins which are filtered by bivalves and accumulate in their flesh
Who carries out the monitoring of contamination in seafood?
Centre for environment, fisheries and aquaculture science (CEFAS)
Under European Union food hygiene legislation, what products require freeing before consumption?
Sushi fish and cold smoked, finish or molluscs destined to be consumed lightly cooked or raw
How long must fishery products be frozen for?
- 20’C for not less than 24h
- 35’C for not less than 15h
What are the exceptions to freezing of fish?
If the fish is cooked before consumption at a core temp of over 60’C for 1 min
Frozen fish products stored at -18’C for 4 days
Wild catches authorised by the FSA (currently no exemptions in the UK)
Farmed systems free from viable parasites
What happens to the water in good shellfish farms?
It is passed under a UV light to kill microorganisms (this isn’t great for killing viruses though)
Inshore waters are graded from A-D, what does grade A mean?
Molluscs contain less than 250 E.Coli per 100g of flesh- fit for human consumption
Inshore waters are graded from A-D, what does grade B mean?
90% of sampled molluscs have up to 4,600 E.coli per 100g of flesh
10% of sampled m have up to 46,000 E.Coli per 100g
Inshore waters are graded from A-D, what does grade C mean?
<46,000 E.Coli per 100g
Inshore waters are graded from A-D, what does grade D mean?
> 46,000 E.Coli per 100g
What are finfish?
Marine: Atlantic salmon, cod, halibut
Freshwater: Rainbow trout, brown trout, carp
