Slaughtering and freezing trout
(slagtning og frysning af ørreder)

Denmark
2000


Trouts produced in farms are usually slaughtered, packed and frozen before distribution to the market. Some trouts are filleted before packing and others are gutted and packed with fins, head and tail (So-called "portion trouts").
 

Process description

The present data refer to "portion trouts", which are slaughtered and packed in two-unit packs (net weight 340 g) in one major trout freezing and packing factory located in Jutland, Denmark in 2000. The main processes are following: 1) living trouts from the trout farms are stored in storage dams, 2) the trouts are pumped into the factory, 3) the trouts are slaughtered and guts are sucked out automatically 4) the trouts are cleaned manually and the fish are sorted by weight, 5) the trouts are wrapped in plastic foil and packed in cardboard packaging, 6) the fish are frozen in the pack (plate-freezer), 7) the fish packs are packed in cardboard containers and stored frozen until transfer to the market. Wastewater generated during the processes is sent to municipal wastewater treatment. Guts are sold to fishmeal factories (95%) and to biogas production (5%). The process is modern with a high degree of automation.


Data collection and treatment

Data on electricity and fuel oil consumption are derived from the factory’s 2000 record. Average data for 2000 have been calculated.
 

Technical scope

All production processes as well as administrative processes are included. Helping agents and packaging materials have been ignored.


Representativity

The data supplier produced 338 ton trouts in 2000 and is the largest producer in Denmark. The factory represents more than 50% of the total production of portion trout in Denmark.
 

Validation 

No validation has been performed
 

Inputs and outputs

The table below shows inputs and outputs associated with production of 1 kg frozen portion trout. All data are provided per kg of trout (net weight) at the factory’s gate. 

 

 

Unit

Quantity

Inputs

Materials

 

 

Living trouts

kg

1.18

Water (drinking quality)

litre

5.3

Ammonia

g

0.12

Energy

 

 

Electricity

kWh

273

Heat

MJ

0.22

Outputs

Product

 

 

Frozen trout

kg

1

By-products

 

guts (used for fish meal)

g

 167

Emissions directly to water

 

 

BOD

g

5.0

Total nitrogen

g

1.3

Total phosphorus

g

0.53

Emissions to municipal wastewater treatment

BOD

g 6.0

Total nitrogen

g 0.51

Total phosphorus

mg 86

Location in database: Material/Food From industry/ From Fish industry/Trout, slaughtered, frozen (market regulated)

 

Administrative information

 

Data URL: http://www.lcafood.dk/processes/industry/slaughtingtrout.html
Version no.: 1.00
Authors: Erik Olsen, Højmarklaboratoriet and Per H. Nielsen,
2.-0 LCA Consultants.
Data entry: Data have been entered in this format by Erik Olsen and Per H. Nielsen

Data completed: July 2003.
.