CONDITIONS DO AND BOD5 IN REARING TANKS OF (Pangasianodon hypopthalmus) TREATED WITH PHOTOPERIOD MANIPULATION AND BIOFLOC SYSTEM

Abstract

Rearing Pangasius hypopthalmus under short manipulated photoperiod is able to improve
the growth of that fish, but the water quality of those rearing tanks were poor as there was
no phytoplankton to reduce the organic materials. By using the biofloc system, the organic
materials might be processed and the water quality might be maintained. To understand the
water quality of P. hypopthalmus reared in the tanks with manipulated photoperiod and
biofloc system has been conducted in June to august 2020. Sampling DO and BOD5 was
carried out 4. Results shown that the DO of tanks with biofloc system was higher (11.814.49
mg/L)
than
that
of
the
tanks
without
biofloc
system
(11.81-7.68
mg/L).
The
water
in

the
tanks
with
biofloc
system
also
shown
better
results
on
BOD5
(4.28-7.68
mg/L).
In
the

tanks

without the biofloc system, the water quality parameters were as follows BOD5
(4.28-35.22 mg/L). Based on data obtained, it can be concluded that the application of
biofloc system is effective to maintain the water quality in the rearing tank of P.
hypopthalmus treated with short photoperiod.