Page 167 - ASBIRES-2017_Preceedings

STUDY ON OPTIMIZATION OF TROPICAL FISH HARVESTING OF A SRI LANKAN FISH FARM

result on the DOH graph would not present
as the opposite on the population graph.
According to the Pearson correlation
there are weak positive correlations between
DOH and Temperature. Also there are weak
negative relationships between DOH-Salinity,
DOH-pH and DOH-Alkalinity. P value of
DOH-Temperature is less than 0.05. There is
enough evidence to reject H0. Therefore, it is
concluded that there is a correlation between
deaths on house and temperature. Therefore,
the model is
DOH = 1.263 × Temperature Figure 4:Effect of the changes of the temperature

Table 1: Coefficients of the model

Coefficients

Unstandardized Standardized 95.0% Confidence Collinearity
Coefficients Coefficients Interval for B Statistics
Std. Lower Upper Toleran
Model B Error Beta t Sig. Bound Bound ce VIF

(Constant) -32.683 17.252 -1.894 .060 -66.774 1.407
1
Temperature 1.263 .579 .176 2.181 .031 .119 2.407 1.000 1.000
a. Dependent Variable: DOH

Figure 3 illustrates that increasing added. Regular cleaning of accumulated
temperature positively affect the DOH. At waste and uneaten fish maintain a good pH
0
0
0
the temperature levels 29 C, 30 C, 31 C, level. Apart from keeping the above
high DOH is recorded. mentioned factors up to standard level,
usage of metal items in tanks can be reduced
According to figures data were plotted
and selected from the most convenient as they make toxins. The main implication
model with high R square value. In each that had affected the findings was due to
polynomial fit coefficients (p1, p2, p3, p4, p5, biologist’s data that was gathered. At the
p6) vary from model to model. By looking at time when the data was gathered it was
the figures drawn for Guppy population, it is noticeable that there were no records of
clear that Guppy also behaves somewhat exact time which temperature is measured.
similar to Wreck fish. Similar to Wreck fish, Further this research can be implemented by
Guppy also does not show any pattern with gathering the data at exact time while
population. As a practice company used to increasing the validity of the model (R-
keep the salinity level 25 ppm-26 ppm, but square) through the ultimate goal of
according to the figure the minimum DOH optimizing the harvesting.
is recorded when salinity level is close to 30, 6 CONCLUSION
31 ppm. When pH level becomes high,
vinegar or CO2 can be added. When it As described in this research, Guppy and
becomes low bicarbonate of soda can be Wreck fish population did not show any
pattern for last five years. It is notable that,

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