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Research Detail

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MD. SHAFIQUL ISLAM
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh

A study was conducted to find out biodiversity of aquatic weeds of haor areas, located in Karimgonj upazila under the district of Kishoregonj from July to November, 2012. A total of 10 weed species were identified from the haor. Among 3 common groups of weeds, 4 species of floating, 4 species of emergent and 2 species of submerged were collected. The major aquatic weeds found in Karimgonj haor include Eichhornia crassipes, Pistia stratiotes, Alternanthera philoxerodies, Azolla pinnata, Lemna minor, Hydrilla verticillata, Ipomea aquatica, Cartophyllum demersum, Aponogeton sp. and Ipomea carnea. Various recommendations and measures have been suggested to improve the biodiversity of aquatic weeds of haor areas.

  Aquatic weeds, Haor area, Karimgonj upazilla
  Karimgonj upazila, Kishoregonj.
  00-07-2012
  00-11-2012
  Animal Health and Management
  Seaweed
  1. To identify different groups of aquatic weeds of studied haor.

Selection and Description of the Study Site: Karimgonj upazila of Kishoregonj district was selected for the study. The primary criterion for the selection of the study area was a suitable geographical coverage of haor as far as possible. At first, primary information was collected from Karimgonj Upazila Fisheries Officer regarding concentration of aquatic weeds in the study area. On the basis of preliminary survey the final decision was taken for the study of this locality. Target Group: In the study area, a large number of fishermen, fish farmer, teacher, doctor, politician, elite person, public representative, day labor etc. were reported the status of weeds. 25 persons were selected for interviewing. They were selected by elite person of local area. Period of the Study: Data were collected by the researcher himself through investigation of haor and personal interview of the fishermen. The study was conducted for a period of 5 months from July to November, 2012. Preparation of Interview Schedule: Interview schedule is an important and useful data collecting tool in survey method. In order to get a complete picture to fulfill the objectives of the study, a draft interview schedule was prepared. Then the interview schedule was pretested in the study area. Attention was paid to incorporate any new information, which was not designed to be asked and filled in the draft interview schedule. The interview schedule was then modified, changed and rearranged according to the experience gathered from the pre-test. The final schedule was developed in logical sequence so that the fishermen could answer chronologically. The schedule included various questions related to socio-demographic condition, present status of flora and fauna and the impacts of aquatic weeds on fish. The selected parameters were as follows: Available fish species name; Available aquatic weeds; Impacts of weeds on biodiversity; Collection of Data: During collection of data, both primary and secondary sources were considered. Primary data were collected from respondents by the researcher himself. Several visits were made to the study area to collect accurate information related to objectives of the study through interview schedule. For the study, a combination of individual interview, such as focus group discussions (FGD) and key informant interviews were used for collecting the data from the respondents. Sample Collection: Aquatic weed samples were collected from the haor on each sampling days. The samples were collected from various sites of the haor. Identification: For the identification, the samples were placed on a table for the easy contrast of vision. Identification was done by only eye observation. Identification was done up to possible taxonomic groups. Finally the results were tabulated.

  MS Thesis, Roll No.: 11 Fish Aqua JD-27 M, Registration No.: 33780 Session: 2006-2007, Department of Aquaculture, Bangladesh Agricultural University, Mymensingh
  
Funding Source:
1.   Budget:  
  

During the study period, a total of 10 species were identified. Among these 10 species, 4 species of floating, 4 species of emergent, 2 species of submerged were recorded. Cause of aquatic weeds destruction: According to opinion and remarks of the local fishermen, Upazilla Fisheries Officers and other elite persons, weed-diversity was being drastically reduced due to use of chot jal (fine mesh net), use of herbicide, fertilization and irrigation, siltation.

  Thesis
  


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