the system where fast growing species
with different feeding habit are cultured in the same pond (Jhingran, 1975).

The probability of increasing fish
production per every unit area, via polyculture, is considerable, when compared
with monoculture systems of fish. Different species aggregations in polyculture
system effectively furnish also to improve the pond environment. Some of the
fish species grown in carp ponds include paddlefish, tilapia and big head carp.
In considering pond polyculture, certain aspects such as feeding, harvest and
marketing should be emphasized first. Statistics show that there was no
information on polyculture practice of Vietnamese koi (Anabas testudineus) in Bangladesh.

In Bangladesh aquaculture, there
are approximately 92 species of exotic fishes are cultured (Bijukumar, 2000)
and provides about 17% to global diet aquaculture production (Shelton and Rothbard,
2006). Koi fishery contributed about 2.8%
of total pond catch since the 1980s (DoF, 1992) and in present years it reduces
to 0.85% (DoF, 1999) to the total pond catch.

In our country Koi is a small
native indigenous species. It looks like greenish in appearance. Earlier the native koi was very
much plentiful in almost all the freshwater body in our country (Mahmood,
2003).
Now a day this species has been reducing day by day due to degradation of natural
water body and its growth rate in the farmer’s culture pond are not expectable
as per need For this
reason Thai koi (Anabus testudineus)
had been brought in 2002 from Thailand for higher taste, growth, nutritious
value and a high market price (Alam et al.
2006). But
it has lost its higher growth rate capability features due to inbreeding in the
fry production period.

To overcome from this problem
Sharnalata Agro Fisheries Limited has introduced Vietnamese Koi (Anabas testudineus) in 2010 which is
very faster growth rate compare to Thai Koi. The color of Vietnamese Koi (Anabas testudineus) is whitish. This koi
can be culture in pond as Thai Koi. Vietnamese koi eat commercial feed as Thai
Koi. As Vietnamese Koi (Anabas
testudineus) is a newly opened species in aquaculture of Bangladesh, no record
yet been sufficient to us about its culture technique, stocking density, food
and feeding behavior, breeding and disease occurrence. It can tolerate harsh
environmental conditions such as wide range of temperature, low oxygen and
other poor water conditions (Habib and Hasan 1994).

It has some special faces such as quicker
growth rate, auxiliary respiratory organs, shorter culture period (within 3-4
months marketable size) and advanced survival rate (Kohinoor & Zaher 2006; Jannat
et al. 2012). It contains great amount of iron,
copper and easily edible poly-unsaturated fats and many indispensable amino
acids (Saha 1971, Kohinoor et al.
1991).