Page 77 - New additives and ingredients in the formulation of aquafeeds

Exploitation costs
The price of a kg of viscera was calculated applying the methodology
followed by ship owner companies. This presents some particular features
when compared to land-based companies since:
· The labour cost of sailors is not fixed; it is calculated as an agreed
percentage (around 25%) on the global amount obtained with the
turnover of the working period. In the present study the working period
was considered the time lapse between the ship departure and arrival to
port. Therefore, the tonnes captured, the composition of the captures,
as well as the average selling prices, were used to determine the wages
of the crew in absolute terms.
. There are fixed costs in each trip regardless its success. Such success
is measured by the size and quality of the catches, as well as by the
setbacks happened during the fishing period.
Therefore, the price of viscera arriving to port will be at least equivalent to
that of the cheapest raw material. Yet, that price would be acceptable while
storage of the viscera does not result in an obstacle to fill the hold with
more valuable captures. Prices of raw material may show a great variation
depending on the fishing ground, species and current demand, from 0.50 to
4.00 €/kg. The price of viscera would be at least 0.5 €/kg for the NAFO area
(rabbit fish, black cardinal fish, king of herrings, Portuguese dogfish) and
0.8 €/kg for other areas requiring a more complex logistics.
Table 6. Total cost of the process required to obtain extract enzymes:
equipment, materials and reagents
Phases Equipment Materials & Reagents
Costs (€)
CEE PEE
1 Freezer -80ºC 9,000 9,000
2
Scales with cabin 850 850
Cutter 1.50 1.50
Aluminium paper 0.15 0.15
3
Potter homogenizer 155 155
Drill 70 70
Test tubes 60 60
Homogenization buffer* 1.04 1.04
Use of purified extracts from fish viscera as an enzyme additive in feeds for juvenile marine fish 75