Mussel farming and health aspects

Question 1

Nævn arten for henholdsvis østers og blå muslinge

Answer 1

Mytolis edulis og Ostrea edulis

Question 2

Hvor findes den største produktion af blåmuslinger i DK ?

Answer 2

Limfjorden

Question 3

Hvor findes den største produktion af øster i DK ?

Answer 3

Kattegat og østersøen

Question 4

Er produktionen steget eller faldet for blå muslinger?

Answer 4

Faldet, fra 1,6 mio tons til 34,000 tons fra 1998 til 2011

Question 5

Which temperature does european flat oyster need for spawning during spring/summer ?

Answer 5

18-20 oC

Question 6

Has the production of european flat oyster increased …?

Answer 6

Yes, from 875 tons in 2003 to 1.489 tons in 2008 in Limfjorden ( but it decreases again in 2013 to 142 tons)

Question 7

Describe the taxonomy

Answer 7

Phylum: Mollusca
Class: Bivalvia
Species: Mussels, oysters, scallops, clams

Question 8

What is the only circulating bloodcell ?

Answer 8

Haemocytes

Question 9

How does the haemocyte move ?

Answer 9

It moves freely out of the sinuses into surrounding connective tissue, the mantle cavity and gut lumen

Question 10

Where does the haemocytes play a role ?

Answer 10

in the

• tissue repair
• internal defense
• nutrient digestion
• nutrient transport
• ekscretion

Question 11

Is vaccination possible ?

Answer 11

No,

because og low specifity and no immunological recognition

Question 12

What disease made a major decrease in oyster production in 1970 ?

Answer 12

Marteliose

Question 13

What disease made a major decrease in oyster production in 1980 ?

Answer 13

Bonamiose

Question 14

Which oyster does Bonamiosis infect ?

Answer 14

Flat oyster

NOT pacific oyster nd American oyster

Question 15

Symptoms of Bonamiosis ?

Answer 15

No specific external signs (loss of condition)

Chronic infections lead to tissue necrosis (gill lesions, destroying og connective tissue)