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utilization of shrimp wastes like  shrimp  chips     to 1970s, a few people used to culture fish in the
             (60%), sauce (5%), paste (10%) etc. However, they    permanent ponds for their own consumption, the
             asked for the assistance of technical  knowledge     species produced were rohu, catla, mrigal, ghainna,
             and credit facilities. Most of the respondents (80%)   long whiskered catfish, freshwater  shark  (boal),
             found NGO as a suitable source for loan.             snake head (shol) etc. Small fishes  like  climbing
                                                                  perch, stinging catfish, walking catfish,  barb,
             515   AKTERUZZAMAN, M. (Dept. of  Agricultural       minnows  etc.  were available in the rice fields
             Economics,  Bangladesh  Agricultural  University,    during  monsoon  season. In 1980s to mid 1990s,
             Mymensingh). Shifting rice farming to fish culture   some rice fields were converted into fish ponds and
             in  some selected areas of Mymensingh,               the people started to produce fish for commercial
             Bangladesh : the process, conflicts and  impacts.    purposes. When rice-fish  farming  became
             Bang. J. Fish. Res., 2005, 9 (1), 97-99.             profitable, a large number  of  people  started
                                                                  converting their rice fields in to rice-fish  culture
             The evolutionary process of converting low-lying     ponds. Culture of some exotic fishes like  silver
             paddy fields into fish farms  and  its  impact  on   carp, tilapia, grass carp, silver barb etc. also started
             agrarian communities in some  selected  areas  of    in the paddy fields. Higher income from fish
             Mymensingh district were studied. This study was     farming contributed .positively in  improving  the
             conducted  through participatory rural appraisal     housing, sanitation and education system  in  the
             (PRA) covering 12 villages from each of selected     study areas. It is seen that the medium and medium
             upazillas  viz.  Fulpur   and   Haluaghat   of       high lands were only used for alternate  rice  fish
             Mymensingh district. A total of 12 PRA sessions      farming. The net income was high  in  any  fish
             were conducted where 90  farmers  participated       based cropping system that motivated the farmers
             during 29 July to 26 August 2004. It is seen that    to introduce fish based cropping system in the low-
             the use of low-lying paddy fields was  mostly        lying inland areas. As a result, the regional as well
             confined to Broadcast Aman  (B.  Aman)  rice         as communal income disparities  occurred.
             production until 1960s. With the  introduction  of   However,  the extraction of ground water became
             modern rice farming technology, the  farmers         common during the dry period as the water was
             started to produce Boro rice in Rabi season and B.   used for both rice and fish farming. Mass
             Aman rice in Kharif season. With the passage of      conversion  of  paddy fields into rice-fish culture
             time, aquaculture technologies have been evolved     ponds caused water logging in the study areas. In
             and the farmers realized that fish farming is more   most cases, the participated farmers mentioned that
             profitable than rice cultivation, and  then  they    they could be easily benefited by producing fish
             started  to  utilize  their paddy fields for alternate   with T. Aman or only fish during  the  monsoon
             rice-fish farming and rice-cum-fish farming. Now     season.  They  agreed  that this was an impressive
             a days, aquaculture based crop production system     technology to them and they could  generate
             is in practice in more than 25% of the  low-lying    employment opportunities throughout the  year.
             paddy fields. Conversion of rice  fields  in  to  fish   Finally, the social, economic and  technical
             ponds has brought up a change  in  the  livelihood   problems  which  are  acting as constraints to rapid
             patterns of the rural farmers. The areas where the   expansion of fish production system were reported
             farmers involved themselves in the new production    from the interviewee.
             systems were fingerling  collection,  transportation
             and marketing of fry and fingerlings. During 1960s




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