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International Journal of Aquaculture, 2013, Vol.3, No.26, 152
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157
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156
Table 5 Benefit and cost of sea cucumber cultured in 2.3
-
ha pond
Pond 3
Construction phase Year1
Year2
Year3
Year4
Year5
Year6
-
Year10
Cost
Capital and infrastructure costs
Construction cost
85000
0
0
0
17500
0
17500
Shelter
104895
0
0
0
0
0
0
Vehicle
10000
0
0
0
0
0
0
Operational costs
Electricity
10000
10000
10000
10000
10000
10000
Equipment
800
800
800
800
800
800
Maintenance
200
200
200
200
200
200
Salaries
24000
24000
24000
24000
24000
24000
Chemical/cleaning products
10000
10000
10000
10000
10000
10000
Stock purchase
208000
11400
103833
128007
149707
149707
Water quality, fish health assessment
15000
15000
15000
15000
15000
15000
Income
Net fish sales (US$)
0
388000
1032000 836062.5 966000
966000
Average weight of sea cucumber sold
120
120
120
120
120
120
Total production
0
7000
14000
10500
10500
10500
Biological variables
Mortality
0.86
0.86
0.86
0.86
0.86
0.86
Weight gain
0
100
50
-
118
50
-
118
50
-
118
50
-
118
Table 6 IRR, NPV and payback period of the three ponds in ten year period
Pond size (Ha.)
0.50
1.20
2.30
NPV
1078217.33
1806509.17
3133294.17
IRR
0.67
0.65
0.86
Payback period (year)
2.80
3.92
2.69
3 Discussion
3.1 Pond size and income
The income increased with the increasing pond size
but the survival rate and income per unit decreased.
Ionno et al (Ionno et al., 2006) assumed that the
outcome per unit varied with different culture scales in
finfish grow out system. The culture model and
technique influenced the production and economic
income of milkfish fry (Lee et al., 1997). In addition,
the production of sea bream in net pen increased with
the increasing culture area, i.e. the pen area correlated
positively with the catch production (Gasca-Leyva et
al., 2002).
3.2 Key variables
There are many factors that influence the production
and economic income of sea cucumber culture, such
as stocking density, juvenile size, water exchange rate
and culture model. The survival rate of juvenile sea
cucumber whose length was shorter than 5 cm was
less than 30 percent; the survival rate of juveniles at
length of 5-10 cm was 30-70 percent; and that of
juveniles whose length was more than 10 cm exceeded
90 percent (Chang et al., 2004). According to the
collected data, the stocking density of sea cucumber
varied from 5 ind./m
2
to 8 ind./m
2
, and the stocking
size varied from about 10 ind./m
2
to 800 ind./m
2
.
However, the total survival rate was from 14% to 26%.
The coculture ratio influenced IRR and NPV when
tilapia was cocultured with redraw crayfish
(Ponce-Marban et al., 2006). In addition, shelter types
were influence the growth and production of sea
cucumber (Qin et al., 2009).
3.3 The prospect of sea cucumber culture
From the collected data, it is revealed that low
stocking density and the case of single species were
the main factors that limited the production and
economic income. Since there is still great potential in
increasing the economic income, many studies have
been done with the aim of increasing the production
and economic income of sea cucumber culture in