Salinity Intrusion Impacts on Fisheries of Nabaganga River, Bangladesh

Md Shariful Islam, Md Abdul Wahab, Shahroz Mahean Haque, Muhammad Shahidul Haq, Nafia Binte Ryhan

Abstract


One of the crucial problems in the coastal zone of Bangladesh is salinity intrusion and it is increasing very alarmingly due to natural and anthropogenic reasons. Fish contributes about 58% to animal protein intake of the people of Bangladesh. The present study provides to prepare faunal data on ichthyodiversity of Nabaganga River and an assessment of changes of fish diversity with the changes of salinity level in the Nabaganga River over the last forty five years. This study is carried out in selected villages of slight salinity prone area, namely Bordia, Shuktagram and Gajirhat of Kalia Upazila, Narail. The study was conducted both primary and secondary data sources. To collect primary data different methods had been adopted which were informal interview, a pre-formulated questionnaire survey and Focused Group Discussion (FGD). Local people’s perception, experts’ judgment was used in detecting decreasing or disappearing of fish diversity with increasing in river salinity. The study has revealed that in Bordia point, the salinity varies approximately within the range from 0.00 to 0.92 ppt. It has been observed that around 1.00 ppt salinity in the Bordia point of Nabganga river which around 165 km down of the Harding Bridge and 72.3 km up from Khan Jahan Ali Bridge, Khulna of Rupsha River. But this Bordia area was totally fresh before this century. Salinity intrusion and decline of freshwater flow exerts threat to the fish diversity and existence in the Nabaganga River of the Gorai river system. The study has showed that due to increased salinity, the fish species in Nabaganga River has been reduced from 41 to 35 species during the period 1970-2014 and six species of fishes have already been disappeared. In this perspective, some time oriented immediate steps should have to take to protect salinity intrusion and to find out suitable ways to adapt with salinity problems with the collaboration of Government, local NGOs and other stakeholders.

Aus. & NewZe J. Soci Busi. Env. Sus. Vol 2(2), October 2016, P 133-152


Keywords


Climate change; salinity intrusion; occupation; fish

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