annual report - Central Institute of Brackishwater Aquaculture

TECHNOLOGY IMPROVEMENT DIVISION
Developmmt of feeds for aq~ucdhm of
brackisbwater shrimp and finfishes
m P )
Madm : S. A. Ali (PL), M. Natarajan,
D. N. Swamy, N. Kalaimani, C. Gopl, J.V.
Ramana, K. K. Krishnani and M. Shashi
SheLhar
Puri : C. P. Rangawamy
Mhputiculate feeds for shrimp larvae/
post-1mae
Micro-particulate feeds developed by
the Institute for shrimp larvae and post-larvae
were further improved by replacement of
the milk protein, casein, with an equivalent
amount of duck egg and by increase of total
Lipid content with the addition of fish oil. The
proximate composition of the feed prepared
by freeze- drying is as follows : protein 46.3%,
fat 15.0%, carbohydrate 17.0%, ash 10.93%
crude fibre 0.42% and moisture 10.45%.
This feed was successfully tested onP. monodon
larvae (Nauplius G) stocked in FRP
tanks (each 500 litre capacity) 6) 10 no.11
The survival rate of larvae upto PLl at the
end of 8-9 days, when fed on a mixed diet of
micro-particulate feed (2.5 g/tank) and diatoms
(20,003 cells/ml), was much higher
(90%) than those fed exclusively on diatoms
(40,000 crells/ml), or microdiets (5.0 gl tank)
(73% and 40.6% respectively). In the case of
post-larvae (PLl to PL20), stocked in similar
tanks @ 4 no.11, though the sumival rate
recorded at the end of 20 dayswas higher with
microdiet (2.5 mglpost-larvae) alone, being
57%, than with Artemla nauplii (20 naupliilpost-larvae),
being 42%, the growth of
post-larvae was better when fed with live feed
clam meat, squid meal, polychaete worn
and gingelly cake. One of the feeds, containing
40% protein and incorporating free
amino acids as attractants, was found to be
readily accepted by the shrimp. The feeds
were analysed for their essential amino acid
composition (EAA) (Table 1). Bawd on this,
the formulations were further refined to
match the EAA profile of shrimp muscle.
Feeding trials with ablated animals are undelway.
A feed was also formulated for the
broodstock of grey mullet. M. cephalur, using
indigenous ingredients vu., fish meal (16%).
soya flour (18%), groundnut cake (a%),
cotton seed cake (S%), wheat bran (IS%),
wheat flour (10.0%), maida (2.3%), alfalfa
(4.8%), vegetable oil (6%), yeast (O.S%),
Spirulina (0.2%) and vitamins, minerals end
antioxidants (2.2%). The feed prepared as
dry pellets was found to be readily accepted
by the fish.
Goosebeny u, a source of vitamin C in
shrimp feeda
Gooseberry as a source of Vitamin C
was tested in the diet of tiger shrimp P.
monodon. Feeding trials with juveniles for a
period of 30 days indicated better growth and
survival of shrimp when gooseberry was incorporated
in a standard diet at 3% level (dry
weight) compared to diets fortified with plain
and protected vitamin C (Phosphate derivative).
Improvement of farm-made shrimp feeds
in selected areas through Farmers Contact
Prognmme
(16.6 mm at PL20) than with minodiet (14.4 A comprehensive survey was conmm
at PUO).
ducted on the use and improvements in fam-
~ ~ ~ md testhg ~ lof feeds d for i made ~ shrimp ~ feeds in the districts of
broodstock shrimP/fish
Godavari, Krishna, Prakasam and Nellore in
Andhra Pradesh. The survey revealed that.
Feeds were formulated for the brood- commercial shrimp feeds, both indigenous
stock of tiger shrimpP. monodm using fresh and imported have largely replaced hitherto