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transferred to farmer's pond and were subjected to survival rates (57.5-59.0%) in all the three
observational trial. Length and weight of each of
the test mussels were recorded before hanging
them at a depth of 40 cm in net bags (3 mussels/net
bag) in ponds at the rate of 24,700 mussels/ha of
pond area. Ponds were routinely fertilized with
organic and inorganic fertilizers thorough out the
mussel rearing period. Water temperature, pH,
plankton density .and soil organic matter were
monitored fortnightly. Growth of pearl is yet to be
monitored through sacrifice of the mussels but X-
ray photography of a few mussels indicated the
initiation of pearl formation in most of them.
607 SULTANA, N.; UDDIN, K.M.A.;
AHASAN, C.T. & HUSSAIN, M.G. (Freshwater
Station, Bangladesh Fisheries Research Institute,
Mymensingh). Nursery management system of
stinging catfish, Heteropneustes fossilis and
walking catfish, Clarias batrachus in Bangladesh.
Bang. J. Fish. Res., 2005, 9(1), 35-36.
A total of four experiments were conducted to
develop nursery management system for the two
important native catfishes viz. stinging catfish,
Heteropneustes fossilis and walking catfish,
Clarias batrachus during 2003 and 2004. Two
experiments were conducted in on-station
condition to determine stocking density efficacy
in hapa and in earthen mini ponds for H. fossilis.
This was followed by on-farm trial on stocking
density in earthen mini ponds. In hapa, the
highest survival rate was 60% for H. fosssilis at
2
stocking density of 100/ m ; followed by 54.5
and 50% at stocking densities of 150 and
2
200/m , respectively. Similarly, gain in weight
and length was also better in lower stocking
densities. Similar survival rate (45 to 55%) was
observed in three densities in earthen mini
ponds. However, gain in weight and length
showed no significant (p<0.05) differences. H.
fossilis, C. batrachus showed almost similar
220
2
stocking densities (100, 150 and 200/m ) in
earthen mini ponds in on-station condition. In
terms of gain in weight and length showed no
significant (p<0.05) differences in pond
conditions. Almost similar result was obtained in
terms of growth and survival in on-farm
condition.
608 TAFADER, M.K. (Dept. of Environmental
Science, Linkoping University, Sweden); UDDIN,
M.M. (Institute of Marine Sciences & Fisheries,
University of Chittagong); NESSA, M.U.
(Environmental Science Discipline, Khulna
University, Khulna) & MOSTAFA, M. (Fisheries
& Marine Resource Technology Discipline,
Khulna University, Khulna). Climate Change and
its Consequences on Marine Ecosystem. South
Asian J. Agric., 2007, 2(1 & 2), 101-106.
The globe, the only abode for human as well as all
living beings are warming at a rate greater than at
any period that scientists are warning since last
century. According to the land water distribution,
two third of the earth is covered by the water and
among the total water 97.5 percent belongs to
marine environment. This bulk volume of marine
water bearing complex physical, biological and
chemical characteristics as well as diversified
organisms structure make itself an important
ecosystem in the earth. This valuable ecosystem is
now under threat due to climate change by natural
and anthropogenic processes mostly human-
induced activities. Oceans, estuaries, mangrove
forests, coral reefs and sea shores are important
part of marine ecosystem but affected by climatic
variations. Climate induced phenomenon trigger
the environmental degradation, biodiversity and
habitat loss, ecological imbalance as well as wroth
of global economy. This paper highlights the
potential negative consequences on marine
ecosystem due to the global climate change.