Filleting of fish
(filletering af fisk)
|
Denmark,
Africa and USA
1990-95
|
Fish for human consumption are often filleted and
frozen before transfer to the market.
Process description
The present data refer to filleting of white fish such as codfish and
flatfish and oily fish such as herring and mackerel. The main processes are
following: 1) pre-treatment (removal of ice, washing and eventually deheading,
gutting and cutting of tails), 2) filleting at
mechanical filleting machines, 3) eventually removal of skin, 4) trimming (removal
of bones and defects, cutting into appropriate pieces), 5) packing,
freezing and storage. Wastewater generated in Danish factories is usually treated in municipal
wastewater treatment plants. Fish waste
is usually converted into fish meal.
Data collection and treatment
Data have been collected from Danish plants and
from a few African and American plants in 1990-95 by Jespersen et al. (2001).
Technical scope
Main processes at the factories
are included. Packaging
is not included.
Representativity
The figures vary considerably from factory to factory, from fish specie to
fish specie and even from fish to fish and the present data should only be seen as an order of magnitude.
Validation
Data presented here do not match very well
with data presented by Ziegler (2000).
Different system boundaries and different processes can possibly explain
differences.
Inputs and outputs
Inputs
and outputs associated with white
and oily fish filleting
are shown in the table below. Data
are provided per
ton of fish entering the filleting factory.
|
|
|
Unit |
Quantity |
|
|
|
|
White fish |
Oily fish |
|
Inputs |
Fish |
ton |
1 |
1 |
|
|
Electricity |
kWh |
76 |
75 |
|
|
Water |
m3 |
8 |
6.5 |
|
|
|
|
|
|
|
Outputs |
Filleted and frozen fish |
kg |
450 |
500 |
|
|
Fish cut off and
guts |
kg |
565 |
425 |
|
|
Emissions to wastewater treatment plant |
|
|
|
|
|
BOD |
kg |
35 |
50 |
| |
COD |
kg |
50 |
85 |
| |
N-Compounds |
kg |
0 |
2.5 |
|
|
P-Compounds
|
kg |
0
|
0.2 |
|
Location
in database: Processing/Food
Processing/Filleting of fish... |
References:
Jespersen
C, Christiansen K and Hummelmose B (2001).
Cleaner Production Assessment in Fish Processing. United Nations Environment
Programm; Division of Technology, Industry and Economics. Agri-food
forum.
Ziegler, F (2002).
Environmental assessment of a Swedish, frozen
cod product with a life cycle perspective. A data report. SIK - Institutet
för Livsmidel och bioteknik. SIK
report no. 696.
Administrative information
Data URL: http://www.lcafood.dk/processes/industry/filletingfish.html
Version no.: 1.00
Authors: Per H. Nielsen,
2.-0 LCA Consultants
Data entry:
Data have been entered in this format by Per H. Nielsen.
Data completed: July 2003.
|