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Effect of inland water salinity on growth, feed conversion efficiency and intestinal enzyme ativity in growing grey mullet, Mugil cephalus (Linnaeus) field and laboratory studies.

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Title Effect of inland water salinity on growth, feed conversion efficiency and intestinal enzyme ativity in growing grey mullet, Mugil cephalus (Linnaeus) field and laboratory studies.
Not Available
 
Creator A.R.T. Arasu
Barman,U.K.
S.N.Jana
S.K.Garg
Anita Bhatnagar
 
Subject Carcass composition
Conversion efficiency
Digestive enzymes
Growth
Mullet
Pond productivity
Salinity
 
Description Not Available
Two experiments were conducted to investigate the effect of inland water salinity on
growth performance, feed conversion efficiency and intestinal enzyme activity in grey mullet. In
experiment I, a 90 day monoculture of grey mullet at different salinity levels (0, 10, 15, 20 and 25&)
was carried out. The fingerlings were stocked at 5000 per hectare and fed on a supplementary diet at
5% BW d 1
. This Study revealed that fish growth mean body weight (90.5 ± 4.5 g) and mean
length (21.6 ± 0.4 cm), SGR (4.70%) and growth per day (0.99 g d 1
) were significantly
(p < 0.05) enhanced in fish maintained at 10& salinity in comparison with other treatments.
Nutrient levels, phytoplankton population, NPP and chlorophyll ‘a’ all decreased with an increase
in salinity (>10&). In addition, zooplankton populations increased with an increase in the salinity
level. Most of the other hydrochemical characteristics remained at optimal levels in all other
treatments. Fish weight gain showed a significant positive correlation with productivity indicating
parameters viz. alkalinity (r = 0.53), turbidity (r = 0.62), NPP (r = 0.75) and chlorophyll ‘a’
(r = 0.46), clearly revealing that fish growth is also related to the trophic status of the ponds. In the
second experiment (Experiment II), mullet fry were exposed to five different salinity levels (10, 15,
20, 25 and 30&) and maintained for 70 days in the laboratory. Significantly (p < 0.05) high
growth, (SGR and per cent increase in body weight), feed conversion efficiency and intestinal
enzyme activity were observed in the group maintained at 10& salinity in comparison with other
groups maintained at similar salinity levels. Carcass composition, musc1e and liver glycogen levels
were also significantly (p < 0.05) affected by salinity changes.
Not Available
 
Date 2023-11-20T11:18:15Z
2023-11-20T11:18:15Z
2005-06-01
 
Type Journal
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/80894
 
Language English
 
Relation Not Available;
 
Publisher Not Available