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591 RABBANI, A.G.; SIDDIQUI, M.N.; KHALAQUE, M.A. (Dept. of Fisheries, Dhaka
KUMAR, S.K.; RAHMAN, S.H. & UDDIN, University, Dhaka). Effects of Dietary Vitamin C
M.N. (Fisheries & Marine Resource Technology on the Feed Utilization and Growth Performance in
Discipline, Khulna University, Khulna). Koi Fish, Anabas Testudineus (Bloch, 1792).
Favourable Abiotic Environmental Condition for Bang. J. Zool., 2007, 35(1), 95-105.
the Prevalence of Ruppia Maritima (Wigeon
Grass) in Shrimp Culture Ponds. South Asian J. The present study evaluated the role of pellet feed
Agric., 2006, 1(2), 28-31. supplemented with and without vitamin C on the
growth, survival and feed utilization efficiency in
A three-month study was conducted to identify the climbing perch Anabas testudineus in flow-through
vital abiotic factors that affect the prevalence of systems under laboratory conditions. In particular,
Ruppia maritima in the traditional shrimp culture the evaluation was made in terms of feed
ponds. Among six experimental ponds, three were conversion ratio (FCR), protein efficiency ratio
with R. maritima and the other three were without (PER), feed efficiency, average daily gain (ADG),
R. maritima. Water depth, pH, alkalinity, dissolved specific growth rate (SGR) and condition factor of
oxygen, salinity and transparency of the ponds the fish. The experimental diets were: diet 1
were measured from three ponds having R. (without vitamin C; control) and diet 2
maritima vegetation and compared with those (treatment 1) and 3 (treatment 2) with 600 and
measurements from three ponds having no R. 1250 mg vitamin C per kg feed, respectively.
maritima vegetation. These abiotic factors have Fish fed 1250 mg/kg of vitamin C had the lowest
been reported to affect the physical, chemical and FCR (1.57 ± 0.10 %) while the highest FCR
biological characteristics of the six ponds. The (3.43 ±0.12 %) was observed in control (group
three ponds having R. maritima vegetation and of fish fed 0 mg vitamin C per kg feed). The
clay-loamy bottom had salinity, pH, alkalinity, PER was the highest (1.61 ± 0.12) in treatment 2
transparency, and water depth data which were and the lowest (0.73 ± 0.02) in the control fish.
quite different from the data obtained from the However, PER in the treatment 1 was
ponds having no R. maritima. But dissolved significantly higher than that of control and
oxygen parameters for both groups of ponds did lower than treatment 2. The highest SGR (1.75 ±
not show any significant difference. The 0.11 %/d) was measured in the treatment 2 while
significant difference among the means of salinity, the lowest (0.80 ± 0.12 %/d) was found in the
pH, alkalinity, transparency, and water depth control fish. However, the SGR (1.31 ± 0.03
between the ponds with and without R. maritima %/d) observed in the treatment 1 was
suggest that these abiotic factors. contribute significantly lower than that of treatment 2 and
substantially to the water quality parameters of higher than that of the control. The highest ADG
shrimp ponds and thereby to the biotic parameters (0.282 ±0.012 g/d) found in the fish was in
of them. treatment 2 while the lowest ADG (0.140 ±
0.003 g/d). However, the ADG (0.220 ± 0.006
592 RAHMAN, A.F.M.A. (Dept. of Fisheries g/d) measured in the treatment 1 was
and Marine Science, Noakhali Science and significantly lower than treatment 2 and higher
Technology University, Noakhali); MUSTAFA, than that of control. The condition factor k was
M.G. (Institute of Food, Science & Technology, highest (0.74±0.10 %) in the treatment 2 and
BCSIR, Dhaka); WAHED, M.A. & lowest in the control (0.38 ± 0.05 %). Results of
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