| dc.description.abstract | A study was conducted to investigate the impact of climatic change on fish biodiversity of
Hakaluki haor for a period of one year from July 2013 to June 2014 based on direct fish catch
sampling, interview including focus group discussion in three representative sites viz. Barolekha
(Gollar beel), Khulaura (Nagua beel) and Fenchuganj (Gilachaki beel). It was observed a total of
82 fish species belonging to 9 orders under 22 families of 54 genera; Among the order
Cypriniformes covered 35.37%, Beloniformes 2.44%, Osteoglossiformes 2.44%, Perciformes
28.05%, Siluriformes 25.61%, Clupeiformes 2.44% and the rest were 3.66% from other fish
species. Among the families, Belonidae covered 1.22%, Hemirhamphidae 1.22%, Aplocheilidae
1.22%, Cyprinidae 31.71%, Cobitidae 3.66%, Schilbeidae 6.10%, Notopteridae 2.44%,
Ambassidae 4.88%, Anabantidae 7.32%, Channidae 6.10%, Cichlidae 2.44%, Gobidae 1.22%,
Mastacembelidae 3.66%, Nandidae 2.44%, Synbranchidae 1.22%, Bagridae 10.98%, Clariidae
2.44%, Heteropneustidae 1.22%, Schilbeidae 6.10%, Siluridae 3.66%, Tetraodontidae 1.22% and
Sisoridae 1.22% of total fish species. The present condition of families compared with twenty
five years back is very much alarming where Belonidae, Hemirhamphidae, Aplocheilidae,
Cyprinidae, Cobitidae, Clupeidae, Engraulidae, Notopteridae, Ambassidae, Anabantidae,
Channidae, Gobidae, Mastacembelidae, Nandidae, Synbranchidae, Bagridae, Clariidae,
Heteropneustidae, Schilbeidae, Sisoridae, Siluridae and Tetraodontidae families were existed in
100%, 50%, 100%, 54.17%, 20%, 50%, 0%, 100%, 100%, 120%, 100%, 50%, 100%, 100%,
100%, 47.37%, 200%, 100%, 62,50%, 11.11%, 100%, 100%, respectively and Syngnathidae,
Dasyatidae, Amblycipitidae, Sciaenidae, Mugilidae, Chacidae, Olyridae, Psilorhynchidae and
Anguillidae are reduced to zero percent (0%) in the last two decades and newly introduced genus
is Cichlidae. However, Cichlidae has reinstated in the haor which might be due to stocking and
beel nurseries programme in this area including escaping species from aquaculture due to flood.
About 76.67%, 70%, 60% and 56.67% of the respondents mentioned that flood, drought, rainfall,
and temperature is responsible for decreasing fish biodiversity in the haor. Moreover, 6.67%
respondents mentioned cyclonic effect is also responsible for diminishing fish biodiversity.
Besides, seasonal changes, pollution, lack of water, habitat destruction, fishing by completely
drying and siltation are also important causes of fish biodiversity degradation of the haor area.
The temperature was recorded 29±0.5
C during observation and it was also observed the average
temperature 29.50
o
0
C in the year of 2009 to 2013,
respectively. The average rainfall was 300mm which is higher than optimum range in the haor
and 219.544mm, 325.906mm, 285.063mm, 288.937mm and 318.472mm rainfall were recorded
in 2009, 2010, 2011, 2012 and 2013, respectively. The variable climatic factors, breeding and
spawning of fish species are being changed so that the every year number of species is
decreasing every year; and already 33 species have been lost within 25 years. Therefore, it is the
proper time to take necessary steps by the stakeholders and the competent authority for saving
this natural waterbody and resources for our own interest and future generation.
0
0
C, 29.00
0
C, 29.08
0
C, 28.92
C and 29 | en_US |
