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individual fishes. A number of breeding Mystus FiSAT programme was used to estimate
bleekeri (weighting 80-170g) were induced to
breed with a series of PG doses by injecting a
single dose of 0.6 to 1.5mg/ l00g body weight. The
performance of each of the treatment dose was
evaluated in terms of ovulation response,
fertilization and hatching rates of eggs. The
optimum dose obtained for breeding was 1.1 mg
PGE/l00g body weight and at that dose, the
fertilization rate was 76±5.32% and hatching rate
of egg was 79±4.68%. The fish spawned naturally
in concrete cisterns after 7-8 hours at an ambient
water temperature of 25° to 28°C.
581 MUSA, A.S.M. & BHUIYAN, A.S. (Dept.
of Zoology, Rajshahi University, Rajshahi). The
Spawning Periodicity of Mystus Bleekeri (Day)
From the River Padma of Bangladesh. Bang. J.
Zool., 2008, 36(1), 43-48.
A total of 550 specimens (240 males and 310
females) of Mystus bleekeri (Day) was collected
from different fish landing centres of Rajshahi
during the period from April 2004 to March
2005. The spawning periodicity of Mystus
bleekeri (Day) from the river Padma of
Bangladesh was studied. Five maturity stages of
ovary, viz. immature, maturing, mature, ripe and
spent were observed. The high values of GSI in
the months of June, July and August indicated
that these months were the main spawning
seasons of the species and the fish breeds only
once a year.
582 MUSTAFA, M.G. (World Fish Center,
Dhaka) & ALI, S. (Dept. of Zoology, Dhaka
University, Dhaka). Population dynamics and
the management of the Ribbon fish
(Lepturacanthus savala) from the Bay of
Bengal. Bang. J. Life. Sci., 2006, 18(1), 117-
124.
208
population parameters of Lepturacanthus savala
from length frequency data. L α and K were
–1
found to be 108.0 cm and 0.75 year . The
estimate provided by Wetherall plot for L α and
Z/K were found to be 108.9 cm and 4.577. The
growth performance index (φ') was 3.941. The
annual rate of natural and fishing mortality were
estimated as 1.04 and 1.54. The exploitation rate
was 0.65. The selection pattern Lc was 33.77
cm. Recruitment pattern suggests of two
seasonal pulses Sept-Oct and Mar-Apr. Peak
recruitment appeared during September-
October. Highest exploitation was observed
between length class 60.0 to 80.0 cm. Optimum
yield could be achieved simultaneously
increasing length at first capture to 50.0 cm and
decreasing the fishing mortality to 0.72
coefficient rates.
583 MUSTAFI, B.A.A. (Agricultural
Economics Division, Bangladesh Rice Research
Institute, Gazipur). Adoption, productivity and
profitability of rice-fish and fingerling culture in
three selected districts of Bangladesh. Bang. J.
Fish. Res., 2005, 9(1), 83-85.
The study aimed to investigate the productivity and
profitability of rice-fish farming. It also determined
the factors affecting rice-fish and fingerling
production in Bangladesh. Among the total
respondents about 55% were involved in rice-fish
farming, 37% in pond fish culture and rest 9% in
fish nursery. Integrated rice-fish farming
contributed about 83% of the annual farm income
in Comilla while it was about 20% in both
Kishoregonj and Chandpur districts. Among the
different farming systems integrated rice-fish
culture and rearing fingerlings in the nursery pond
were more profitable at the farm level. Farmers
earned a net return of Tk. 49,714/ha from
integrated fish culture with boro rice while the net