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Effect of varying dietary protein levels on growth and production of Chanos chanos (Forskal) in inland saline groundwater: laboratory and field studies.

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Title Effect of varying dietary protein levels on growth and production of Chanos chanos (Forskal) in inland saline groundwater: laboratory and field studies.
Not Available
 
Creator Jana,S.N
S.K.Garg
U.K.Barman
A.R.T.Arasu
B.C.Patra
 
Subject Enzyme activity
Growth
Inland saline groundwater
Milkfish
Nutrition
Production
Protein levels
 
Description Not Available
Two experiments were conducted to investigate the effects of varying
dietary protein (35–45%) and energy levels (17.34–19.44 kJ g)1
on the growth
performance of milkfish (Chanos chanos) maintained under laboratory (experi ment 1) and field conditions (Experiment 2) in inland saline groundwater. The
results of experiment 1 (initial weight of fish: 0.25 g) revealed that, irrespective of
the protein source (fish meal or processed full fat soybean), fish fed a diet containing
40% protein showed significantly (p < 0.05) higher growth in terms of live weight
gain and specific growth rate, low feed conversion ratio [1.71 (fish meal) and 1.58
(soybean)], high nutrient retention (gross protein retention: 28.59 and 31.05%; gross
energy retention: (24.23 and 26.04%), apparent protein digestibility (81.74 and
85.91%) and digestive enzyme activity (specific protease and amylase). An obser vation on the postprandial excretion of metabolites (N–NH4 and o–PO4) indicated
significantly (p < 0.05) low levels of these metabolites in aquaria where the fish were
fed 40% dietary protein irrespective of the protein source. The results of experi ment 2 also indicate (initial weight of fish: 4.43 g) a significantly (p < 0.05) higher
growth performance (weight gain, biomass, specific growth rate, growth day)1 and
fish production) in ponds where the fish were fed 40% dietary protein. Irrespective
of the experimental conditions (laboratory/field), feeding the fish higher dietary
protein levels (beyond 40%) not only repressed growth performance but also af fected proximate composition by lowering protein accumulation and energy assim ilation. An investigation on the effects of feeds on water quality parameters revealed that values for total alkalinity, NH4–N, NO3–N, turbidity, total dissolved solids and
parameters indicative of productivity (chlorophyll a, net primary productivity and
plankton population) increased significantly (p < 0.05) from treatments 1–3 (35–
40% protein) and declined thereafter, in treatment 4 (42% dietary protein), indi cating that water quality characteristics correlated well with fish growth. The results
suggest that in order to obtain a high-yield in milkfish culture system the fish should
be fed supplementary diets containing appropriate (40%) protein levels, especially
when the stocking rates are high.
Not Available
 
Date 2023-09-25T10:17:41Z
2023-09-25T10:17:41Z
2006-07-04
 
Type Journal
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/80554
 
Language English
 
Relation Not Available;
 
Publisher Not Available