IMTA Flashcards
what is IMTA
integrated multi trophic aquaculture
what part of the feed is consumed by fish?
C,N,P
what is in the discharged water of AQC cage?
DOC, DON, DOP (nitrogen and phosphorous) - from ffeaces and feed
POC, PON, POP (feed, feaces, fouling)
CO2
excreted DIN DIP (ammonium phophate)
where do most Particulate material sink down?
close to the fish farm
at what depth canmmost particles be found?
smaller depths
what contributes the most to the carbon footprint of fed aquauculture?
feed production
- fish meal biggest part
- soy and wheat (transport, deforestation of rainforest)
what is the principle behind IMTA:
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.
what are extractive species that live on the seafloor
polychaetes, sea urchins
what are species that filter organic particles from the water?
mussels
what species assimilate inorganic nutrients?
Macroalgae
what was shown in the “integrate project” concerning seaweed groth ?
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
what is the “integrate project”?
project from 2007-2011
one year IMTA case ate ACE location in norway
what was shown in the “integrate project” concerning blue mussel growth ?
order of preferred diet:
- phytoplankton
- fish feed
- faeces
- mussels only utilize the nutrients from slamon farmming, when they cannot eat their natural diet
polychaetes could filter out what kind of wastes ?
DON
PON
what could polchaetes be used for?
as a component of fish feed because high in : -protein -fatty acids -amino acids
