الفهرس 
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Abstract
This study was conducted during a period of six months ( from May,
25th 1993 to December, 1st of the same year) on cornmon carp fish
using twelve 5 x50 m2 concrete ponds with earthen bottom in Abbassa
farm which belongs to Central Lab. for Aquaculture Research (CLAR),
Agriculture Research Center, Ministry of Agriculture, Egypt. This study
was undertaken in order to investigate growth traits and the relations
among them at different post-stocking stages of growth from stocking as
fmgerlings up to 180 days post-stocking. In addition to fish production
traits, carcass traits and chemical composition traits for the whole body
of the fish and only fish flesh when groups of fish ponds were manured
with different levels of duck manure (zero, 500, 750 and 1250 kg per
1050 m2). Results could be summarized as follows:
Growth traits
_Actual means of body weight and body length of common carp
increased successively with advance of period of the study from
stocking up to 180 days post-stocking. while those of condition factor
fluctuated with advance of that period but showed in general a
decreasing trend.
-level of duck manure constituted a significant ( P< 0.05, P<O.OI or
P<O.OOl), important and sizable source of variation in body weight.
body length and condition factor at all or most post-stocking growth
stages studied.
_Body weight and body length increased with the increase of duck
manure level from zero to 1250 Kg/I050 m2 at all post-stoking stages
of growth, i.e. the level of 1250 kg duck manurel1050m2 was the
optimum level since fish of ponds with that level scored the heaviest
body weight and the longest body length.
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Summary
-Differences in growth traits between ponds within duck manuring
level were mostly non-significant and negligible for body weight,
body length and condition factor at different post-stocking growth
stages of the study.
-Specific growth rate % values evaluated during summer months were
generally higher than those evaluated during autumn months
-Specific growth rate1.ranked the first for fish ponds manured with
1250 kg duck manure/IOfif) m2 then followed in a descending order
by fish manured with 750,500 and zero kg per 1050 rrr’,
-A strong positive significant ( P<O.Ol) phenotypic association
between body weight and body length was detected at most stages
studied from fingerlings up to harvest at 180 days post-stocking ( r =
0.76 -0.98).
-A negative association between condition factor and each of body
weight and body length was found at most stages studied.
-Prediction equations for body weight at 90 and 180 days poststocking
through the knowledge of body length at these two stages
were formulated,
Fish production
-During the period of the study ( 180 days), the averages of common
carp fish production traits per pond of 250 m2 and 80 em water depth
were 19.675 kg for total production, 18.090 kg for absolute gain in
fish weight and 100.51 gm for the average daily gain.
-Level of duck manure exerted a significant (p<O.OOl) effect on all
production traits studied in common carp during the period of the
study.
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Summary
-Fish production traits were observed to be increased with the
increase of duck manure level from zero to 1250 kg/ 1050 m2
•
Carcass traits
-Duck manure level constituted a significant (P<O.OOl) source of
variation in all carcass traits of the study.
_The performance of the fish for these traits increased with the
increase of manuring level from zero to 1250 kg / 1050 m2
•
_Differences in carcass traits among fish of ponds within level of
manuring were mostly non-significant.
Chemical composition
-Duck manure level constituted a significant (P<O.Ol or P<O.OOl)
source of variation in all chemical composition traits of either the
whole fish or fish flesh at harvest (180 days post-stocking).
-Dry matter and protein contents of either the whole fish body or fish
flesh at harvest were found to increase in general with the increase
of duck manure level from zero to 1250 kg/1050 m2
, while a reverse
trend was generally observed for fat and moisture contents.