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Proceedings of the 9 Symposium on Applied Science, Business & Industrial Research – 2017
ISSN 2279-1558, ISBN 978-955-7442-09-9

Study on Optimization of Tropical Fish Harvesting of a Sri Lankan Fish
Farm

Gunasekara SGVJC, Dharmawardane PMN
Department of Mathematical Sciences, Wayamba university of Sri Lanka
jayaniacademic@gmail.com

ABSTRACT

Millions of enthusiast for tropical fish in worldwide keeps them as their hobby and
it has become one of the most popular industries in Sri Lanka as well. This research had
been carried out to study about the requirements that could gain the best productivity for
tropical fish industry. For this study two types of fish were selected namely Guppy and
Wreck fish. Several factors that affect for fish population were identified. They are namely
local purchased quantity, breeding, deaths on house, imported quantity, deaths on arrival,
shipment and sick on hand. Deaths on arrival were ignored as it is out of the scope of the
research. Sick on house was also disregarded because if any fish was sick, it was kept in
separate tank. Data from five consecutive years had been examined in order to identify a
pattern in fish population. Further, deaths on house were analyzed using four factors
namely, temperature, salinity, pH level and alkalinity. It was noticed that that there was no
any pattern in each five years. The fish population fluctuated from day to day with the
number of local purchased quantity, shipments and other key factors. The only
controllable factor in order to optimize the fish population was identified as deaths on
house. Moreover, it was assumed that the factors considered equally behaved in each tank.
Finally, the model was constructed by selecting the significant factors that affect for deaths
on house.

KEYWORDS: Deaths on house, Fish population, Optimization

1 INTRODUCTION the ones that affect the fish population
mainly. Fish harvesting in the sense it can be
Many researchers have developed several considered as the fish population which
mathematical models for fish harvesting. brings the revenue to the company. The
Most of them are mainly concerned about revenue on fish industry merely depends on
the freshwater or marine water fish which shipments.
are grown under natural resources. The fish
type Guppy (Poeciliareticulate) from fresh Although the shipment is a major effect to
water farm and Wreck fish the fish population, it is not taken into
(AnthiasSquamipinnis) from marine water account to propose a mechanism for
farm were selected for this research. In a optimizing fish harvest. This ends up with
fresh water farm there is a breeding process four main factors that would affect to the
while collecting species from local fish population. Those are local purchased
suppliers. On the other hand, in marine quantities, imported fish quantities, breeding
water farm there is no such breeding and the DOH. When considering local
process. Marine water tropical fish are purchases, importing fish and breeding, a
collected from divers and a reasonable part particular fish industry can only increase
of the quantity is imported from Maldives. this amount is by scaling up their industry
For this study one of the leading tropical infrastructure. All though it will be handy,
fish exporting company in Sri Lanka was for many fish industries in Sri Lanka,
selected. The research studied the main key broadening their infrastructure comes to
factors that are, local purchased quantity, second priority. Their first priority is to
breeding, deaths on house, imported upsurge their revenues by doing many
quantity and shipments. All these factors are shipments as possible.

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