EFFECT OF INCREASED SALINITY ON FOOD DIGESTIBILITY AND GASTRIC EVACUATION                            RATE IN  GRASS CARP (Ctenopharyngodon idella)

M.Sh.Al-Khashali,; S.A.Al-Shawi,

	EFFECT OF INCREASED SALINITY ON FOOD DIGESTIBILITY AND GASTRIC EVACUATION RATE IN GRASS CARP (Ctenopharyngodon idella)
IRAQ JOURNAL OF AGRICULTURE
Article 1, Volume 19, Issue 4, 2014, Pages 0-0
Authors
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Abstract
This experiment was conducted to investigate the effect of increased salinity to 0.1 , 4 , 8 and 12 g/l. on food digestibility and gastric evacuation rate in grass carp (Ctenopharyngodon idella), the concentrations 0.1 g/l. (tap water) was considered as control. Results of digestibility trial showed that the total food digestibility were 61.28 , 40.64% and 33.45% in salt concentrations 4,8 and 12 g/ l. respectively , while it was 52.18% in control.The values of apparent digestibility of protein were 75.17 , 63.27% and 55.44% in salt concentrations 4,8 and 12 g/ l. respectively, in comparison with control (72.23%). While, the values of apparent digestibility of fat were 52.62, 38.48 and 32.54% in salt concentrations 4,8 and 12 g/ l. respectively, in comparison with control (50.74%). The increase of salinity as well as raise of the gastric evacuation rate , where the first debut of feces was recorded after 4.25, 5.35 and 6.20 h. after food intake in salt concentrations 12, 8 and 4 g/ l. respectively , while it was 6.25 h. in control. Fish were fed a diet contained 32% protein during this investigation.

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