| dc.description | Bangladesh is blessed with vast and rich fisheries resources. The diversified fisheries resources of
the country are divided into two groups as inland and marine fisheries. Inland fisheries has two
subsectors as inland capture and inland culture fisheries. Inland capture fisheries comprise with river
and estuaries, beels, floodplain, Sundarban and Kaptai Lake. The total area of inland water bodies
are 4,72,499 hectares including 7,97,851 hectares of closed water bodies (DoF, 2018). Rivers and
estuaries (excluding the Sundarban) comprising an area of 8,53,863 hectares out of 39,27,142
hectares of total inland open water bodies. From these vast water resources total fish production
during 2017-2018 was about 12,16,539 metric tons of which 3,20,598 metric tons come from riverine
fisheries. Out of total fish production 7.5 percentages comes from riverine fisheries (DoF, 2018).
Fisheries sector is contributing significantly in food security through providing safe and quality
animal protein. This sector contributes 3.57% to GDP and 25.30% to agricultural GDP. Among all
aquatic organisms, fishes are the most dominant and major source of dietary protein for poor rural
people. Fish supplements to about 60% of our daily animal protein intake (DoF, 2018). More than
11 percent of the total population of Bangladesh are engaged with this sector in full time and part
time basis for their livelihoods. This sector also has high potential for the perspective of economic
development of the country. Bangladesh earns a considerable amount of foreign currencies by
exporting fish, shrimps and other fisheries products. | en_US |
| dc.description.abstract | This study was conducted from July 2018 to April 2019 (10 months) to monitor the present status of
productivity and overall health status of Teesta river ecosystem closest to Teesta barrage situated in the
Lalmonirhat district of Bangladesh. Water and sediment samples were collected twice in a month during the
study period from six different sampling sites selected from the upstream and downstream poles of the barrage.
Plankton analysis and identification were done in the laboratory of Fisheries Biology and Genetics department
of Hajee Mohammad Danesh Science and Technology University, Dinajpur. The findings of this study
disclosed the planktonic flora of 27 genera and fauna of 9 genera of Teesta river closest to Teesta barrage
which revealed that comparative higher density of plankton (n >11500 per liter) as well as more number of
planktonic flora (>18 nos.) and fauna (>7 nos.) were available in the early monsoon and monsoon season
(April-September). On the other hand, comparative lower density (n<10000 per liter) and less number of
phytoplankton (<12 nos.) and zooplankton (<4 nos.) were found in the pre-monsoon season (January February). The Teesta riverine ecosystem near to barrage were contained 16 species of macro-benthos from
different groups. Monitored minimum temperature (20ºC) was recorded in January and it was maximum
(33ºC) in July. Gradual increase of temperature was recorded from March to July (early monsoon) indicates
that water temperature is normally uplifted according to the seasonal change. The observed dissolve oxygen
level in the Teesta river showed that relatively lower (6.0 mg/l) DO level was remained in July and
comparatively higher (8.5 mg/l) DO level was found in January. Average temperature and DO were
significantly (p < 0.05) varied among different sampling months. We were found positive relationship between
water temperature and plankton abundance while inverse relationship has revealed between river water
temperature and DO. It is important to note that downstream region of barrage had slightly higher DO level
than the upstream region which might be the impact of barrage water flow. The recorded available pH
values were revealed that slightly alkaline pH level were remained in the Teesta River all the year
round where the range varied from 6.8 to 8. Besides, both NO3-N and PO4-P levels in the study area were
observed little higher in the late monsoon season at upstream and downstream region of the barrage. The
findings of this study suggested that productivity indicators (availability of planktonic flora and fauna) were
better in the early monsoon and monsoon season than the pre-monsoon and late monsoon. Similarly, better
ecosystem health (temperature, pH and abundance of plankton) was also observed in early monsoon season.
Last of all, it can be said that today is the high time to take all effective necessary actions to conserve the
ichthyo-biodiversity of Teesta River particularly to protect and conserve all the commonly available
endangered and critically endangered fishes. At the same time, river associated people and other relevant
authorities should be aware enough to prohibit all manmade interventions that destroying riverine ecosystem health | en_US |
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