IMTA

Question 1

what is IMTA

Answer 1

integrated multi trophic aquaculture

Question 2

what part of the feed is consumed by fish?

Answer 2

C,N,P

Question 3

what is in the discharged water of AQC cage?

Answer 3

DOC, DON, DOP (nitrogen and phosphorous) - from ffeaces and feed

POC, PON, POP (feed, feaces, fouling)
CO2
excreted DIN DIP (ammonium phophate)

Question 4

where do most Particulate material sink down?

Answer 4

close to the fish farm

Question 5

at what depth canmmost particles be found?

Answer 5

smaller depths

Question 6

what contributes the most to the carbon footprint of fed aquauculture?

Answer 6

feed production

• fish meal biggest part
• soy and wheat (transport, deforestation of rainforest)

Question 7

what is the principle behind IMTA:

Answer 7

one species feeds on the wastes of another species.

therbey recycling lost nutrient/energy to natural based ecosystem

integarting of fed species with extractive species at lower trophic levels.

Question 8

what are extractive species that live on the seafloor

Answer 8

polychaetes, sea urchins

Question 9

what are species that filter organic particles from the water?

Answer 9

mussels

Question 10

what species assimilate inorganic nutrients?

Answer 10

Macroalgae

Question 11

what was shown in the “integrate project” concerning seaweed groth ?

Answer 11

seaweed deployed at 5 and 2m grows much better than 8 m deployed seaweed

• seaweed profits from growing close to cage —> grows larger
• seaweed growth was the highest in springe, when lowest nutreint output of AQC
• there is seasonal dependent fouling in august

Question 12

what is the “integrate project”?

Answer 12

project from 2007-2011

one year IMTA case ate ACE location in norway

Question 13

what was shown in the “integrate project” concerning blue mussel growth ?

Answer 13

order of preferred diet:

1. phytoplankton
2. fish feed
3. faeces

• mussels only utilize the nutrients from slamon farmming, when they cannot eat their natural diet

Question 14

polychaetes could filter out what kind of wastes ?

Answer 14

DON

PON

Question 15

what could polchaetes be used for?

Answer 15

as a component of fish feed
because high in : 
-protein
-fatty acids
-amino acids

Question 16

what was shown in the “integrate project” concerning polchaete diet?

Answer 16

polchaete were feed on sludge
microalgae=natural diet of polchaete
–> proposed that the intake of sludge is higher when it includes microalgae mix

BUT NO:
higher growth rate when feed with fish feed and sludge instead of microalga or mix.

• was also shown that the composition of polychaeta fulllfills the requirements for fish feed

Question 17

what are challgenes of IMTA in Norway?

Answer 17

– >production only at experimnetal scale:

• motivation of salmon farmer =lacking
• legislations: licenses can currently only be issued for one commmercial species at a given location
• farm design=challenge

Question 18

IMTA has been practiced in other countries. which?

Answer 18

china, canada, chile

Question 19

give one example for integrated culture of seaweed and finfish

Answer 19

saccharina and palmaria (scotland)