annual report - Central Institute of Brackishwater Aquaculture

Pmject funded by Dept. of Biotechnology
Development of feed technology for semiinten~ive/intensive
shrimp farming
(drurtlon : 4 yeln from 19.121992)
EXTERNALLY FUNDED PROJECTS
Coordinator : Dr. K. Alagarswami
Personnel : S. Aharnad Ali (Principal
Investigator) C. Gopl and J. V.
Ramana
Feeds formulated using indigenous
feed ingredients vu., fsh meal squid meal
squilla meal, soybean meal, wheat flour, fish
oil etc, were tested under yard and field conditions
in P, rndicu~ and P. mondon along
with three u)mmercial imported feeds. n e
growth performance of shrimp with the formulated
fecds was comparah\e to tht obtained
with imported fecds. FCR values inP.
monodon for hoth starter and grower feeds
were 1.76, 1.64, 1.52 and 1.39 for DRT. I.ux
(Waterbasc), C'I' and lianaqua brands resnectivelv.
F('R values obtained in P. indicus
&re 1.9; and 1.93 for l)NS and ('P feeds
respectively. I:ecd productilm Iriala were
rtlrried out ilnd standardixxl using the [ormulated
feeds.
Ilimed on the dietary requiremcntc of
hnth 1'. ~nonrxlon and I'. ind~crrs, vitamin mixtures
were formulated i~nd ina~rporitted at 0
to 2.5% level in shrimp feeds. Results ohta~ned
showcd thr~thc growth 01 the shrimp
was enhanced when the feeds were fi~rtified
with vitamin mixtures ill 0.5 to 1.0% level.
Natural iind s.ynthctic fccd malerials
were tested for their attractiint 21nd growth
promoting properties in 1'. n~onodon.
hing thc natural materials, grciiter ;Ittmc-
Ian1 propcrty wa.5 exhihiled hy fish p:~ste
whilc squid meat exhihiled greater prowlh
promoling propcrty. Synthetic materials
such asllMS showcd lnithgreatcr attractan1
and growtlr promoting pnipcrties.
cated that when feed materialsviz., Oh meal,
shrimp bead and squib wen ~ p u l v e ~
using a 0 J mm screen and pssed through six
different seives of 10, 18,38,52,60 and 72
standard mesh, the digestibility of pellets
ranged from55.6 to 61.4% with 10 to 18 mesh
sieve and 65.1 to 71.3% with 38 to 72 mesh
sieve. The pelletability was also good when
the particle size was 350 microns (38 mesh
seive).
Project funded fmm A. P. Cers Fund
Impact of brackishwater aquaculhm on
the environment (duration from 12.11.
1992 to 11.11.1995)
Coordinator : Dr. K. Aiagarswami
Personnel: K. 0. Joseph (Principal
Investigator), B. P. Gupta, S. V.
Alavandi, S.S.Mishra, K. K. Krishnani
and M. Muralidha
Study of Kandderu Cmek area
The study on the environmental im.
pact of shrimp farming in thc Kandaleru
Creek area was u)mpleted during the year.
'The study revealed that the Kandalcru Creek
ecosystem was suhjectcd to excessive organic
pollution resulting in a serious negative feedback
to the shrimp farming activity of this
area. Environmental dcgdation and detcrioration
in the water quality of thc creek and
adjoining shrimp farms tri~ered the outhrcak
of viral and bacterial diseases during
1994.95 lcading 10 Ii~rg-sale mortality of
shrimp. ('onsequentlp, shrimp tarmingilctivttywas
sucpnded in the area till July /August
IUOS. Thcreafter, A low level of i~ctivity was
observed which was estimated 111 occupy
i~hout 10%1 of the existinr " farm ilrea.
Surveyof thecreekduring 12-13 January
rind 18-19 o~~~~~ 1w5, showed a prce~tihle
imnrovement in weler uualitv ac
L -~ 2 ---
given helow': total suspended solids (TSS)
Studies on the effect of ptlrticle six on
pelletahility and digstihility of feeds indi- 20-42 ppm, turbidity 15-36 NU; COD 3.0 -