Marin fish COD HALIBUT TURBOT SPOTTED WOLFFISH Freshwater anadrom fish SALMON RAINBOW TROUT FISH SPECIES norwegian aquaculture
ATLANTIC SALMON Production of Norwegian salmon
SALMON – life history 1 y 2 y 3 y river Parr, fingerling smolt migrates to the sea 30-40 gram salmon Migrates back to spawing location – spawning in the autumn Return to the river in the summer SALMONFISHING ! SEAWATER SPAWNING – many die after spawning FRESHWATER SEA WATER
Natural life cycle – salmon SMOLT 11-22 cm (20-30 g) Mature after 2-4 years in the sea FRESHWATER Becomes ready for a life in seawater: - silvering - salt excretion - schools In the river 2- 5 y PARR, fingerling SEA WATER EGGS YOLK SAC LARVAE Eyed eggs
Salmon Production SMOLT PRODUCTION BREEDING STATION WELL BOAT HARVESTING PLANT – Slaughter companies Breeding stock Eggs Eyed eggs YOLK SAC LARVAE FRESHWATER SEA WATER PARR SEA CAGE To the BIG,Big world!! SMOLT (80-100 g)
Salmon farming - why success ? Catch of wild salmon (in rivers) : 150 tonnes (2007) Aquaculture production: 800 000 tonnes (2008) Biological research and development Dry feed, Effective vaccines, Breeding programme, Sea sites – long coastline, pure seawater Technology
Fish farming unit
Sea cage Depth: 50 m Volum: 100.000 m 3
Slaughtering Lerøy Aurora, Skjervøy Ca. 240 tonn sløyet laks pr. døgn (2 skift) Ca 70 000tonn pr år - tilsvarer mer enn 4000 vogntog! –som blir ca. 12 vogntog pr. dag – 12 wagons each day! hvert vogntog er lastet med 70.000 middager ! Each wagon has 70 000 diners !!
SIZE OF EGG AND LARVAE Cod Turbot Halibut Wolfish Salmon Live feed Dry feed
The rotifers have low nutritional quality for the fish larvae The rotifers therefore have to be fed with special ingrediens to contain the sufficient level of omega-3 fatty acids Live feed Most marin fish species can not synthetize the omega-3 fatty acids The origin of the omega -3 fatty acids are marin phyto- plankton (algae) and marin fish are aquire the fatty acids because the fatty acids are following in the food chain
Day 0 a. hatching. Day 14Day 21Day 40 ”GREEN WATER” algae Yolk sac depletedt DRY FEED FEEDING OF COD LARVAE ROTIFERS
COD FARMING Broodstock – natural spawing Egg sampling Larvae fed with live feed (rotifers) Fingerlings fed with dry feed Grown to app. 50 g Transfered to sea cages
Cod in sea cage
Codfishing in Norway - BIG-FISHERMEN!!
Even bigger fisherman……..
HALIBUT FARMING Broodstock – spawing Egg sampling – kept in dark tanks
HALIBUT FARMING Larvae fed with live feed (artemia) Larvae fed with dry feed Metamorphosis Rared in tanks – needs bottom
Halibut in sea cages Transfered to sea cages
Halibut in sea cage
SEA URCHIN FARMING Spat producer Feeding with dry feed Marked size app. 50 g Gonads are eaten Price in market : 150eur/kg!!
Next species in norwegian farming ? monk fish, angler fish
Red king crab
THE FUTURE IS FOOD FROM THE SEA!!
Takk for oppmerksomheten – work hard and be kind to your teachers! Thank you for your antation!