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552 JAHAN, M.S.; ISLAM, M.R. & Heteropneustes Fossilis (Bloch, 1822). Bang. J.
RAHMAN, M.R. (Institute of Environmental
Science, Rajshahi University, Rajshahi). Ecology
of Pila Globosa (Swainson 1822) (Gastropoda :
Prosobranchia) in Bangladesh. Bang. J. Zool.,
2007, 35(2), 341-355.
Observations on the habit, habitat, food
preference, breeding biology, population
densities of Pila globosa were made in natural
habitat and under laboratory condition. The
major food items of P. globosa consisted of
submerged hydrophytes, free floating
hydrophytes, floating but rooted hydrophytes
and amphibious hydrophytes and major groups
of algae, such as Cyanophyceae, Chlorophyceae
and Bacillariophyceae. The different habitat
temperature, humidity and rainfall were
29.83±0.59 °C, 84.20±4.35% and 13.00±20.90
mm, respectively during breeding period.
Duration of mating, duration of egg laying,
number of egg clutch, number of egg per clutch,
number of hatch, incubation period and
hatchability were 2.86 ± 0.43 hrs, 4.62 ± 1.09
hrs, 4.88 ± 2.32, 219.70 ± 107.49, 183.36 ±
88.64, 17.19 ± 1.62 days and 87.78 ± 6.81%,
respectively. The humidity, rainfall, duration of
mating, duration of egg laying, number of clutch
and hatchability were positively correlated with
temperature, but the number of egg per clutch,
number of hatching and incubation period were
negatively correlated. The abundance of snail in
ponds, canals, ditches and paddy fields was
2
2
2
8.66±3.67/m . 17.27±9.35/m , 17.96±10.33/m
2
and 2.43±1.23/m , respectively.
553 JAHAN, S.A.; AHMED, M.K.; ISLAM,
M.M. (Dept. of Fisheries, Dhaka University,
Dhaka); MOLLAH, M.A.R. (Dept. of Zoology,
Dhaka University, Dhaka); & HASAN, M.M.
(Dept. of Fisheries and Marine Science, Noakhali
Science and Technology University, Noakhali).
Toxic Effects of Malathion (57 Ec) on
194
Zool., 2007, 35(1), 153-160.
Static bioassays were conducted in the laboratory
for 96 hours to determine the median lethal
concentration (LC 50) of malathion (57EC) to
Heteropneustes fossilis. A preliminary trial was
carried out with the toxicant with a view to find out
a suitable range to be used in actual lethality trial.
Final trial was performed three times. The
mortality of the fish was recorded at 6, 12, 24, 48,
72 and 96 hours of exposure. The mortality data
were used in calculating the LC 50 value for
different exposure times. The final three trial 'A',
'B', and 'C' were carried out. After the three trial
the average LC 50, LC 85, LC 90, LC 95, LC 99, values at
6, 12, 24, 48, 72 and 96 hours exposure were
11.789 (95% CL; 9.759-14.143) ppm, 22.292 (95%
CL; 18.065-30.727) ppm, 25.919 (95% CL;
20.542-37.559) ppm, 32.405 (97% CL; 24.725-
50.428) ppm and 49.264 (95% CL; 34.687-90.456)
ppm, respectively.
554 JEWEL, M.A.S.; RAHMAN, M.M. (Dept.
of Fihseries, Rajshahi University, Rajshahi) &
ISLAM, M.N. (Dept. of Biotechnology, Bangladesh
Agricultural University, Mymensingh). Study of
Genetic Variation in Different Hatchery Populations
of Common Carp (Cyprinus Carpio) of
Mymensingh District in Bangladesh Using
Microsatellite Dna Markers. Bang. J. Bio. Sci.,
2006, 14, 113-120.
Genetic variation of two strains (Scaled and
Mirror) of six hatchery populations of common
carp (Cyprinus carpio) was studied using three
microsatellite loci (MFW13, MFW17 and
MFW28). The loci were amplified by Polymerase
Chain Reaction (PCR). The PCR products were
electrophoresed on 6% polyacrylamide gel and the
alleles were visualized by silver nitrate staining.
All the three loci were found polymorphic. The