PhD Thesis-Dr. M. Hasan – converted
My MS thesis involved an experiment to assess the impact of three feeds—Suny feed (T1), mixed feed (T2), and Saudi-Bangla feed (T3)—on the growth, survival, and production of Thai koi (Anabas testudineus) cultivated in nine ponds (81 m² each) at the Fisheries Field Laboratory Complex, Bangladesh Agricultural University, Mymensingh, over a duration of 99 days. Each pond was supplied with a total of 250 fry, with three replications conducted. Fish nourished with Saudi-Bangla feed exhibited the greatest weight increase (78.90 g) and yield (2435 kg/ha/99 days), whereas Suny feed resulted in the least growth. Nonetheless, blended feed had the greatest net profit and benefit-cost ratio. Water quality stayed within acceptable parameters. Biological investigation indicated that fertility varied from 3,965 to 60,500 eggs, exhibiting a positive correlation with body and ovary weight, implying that a mixed diet is more cost-effective for Thai koi cultivation.
In my doctoral research, I have examined species diversity among anurans in Bangladesh. I quantified the extent of genetic differentiation among populations using DNA analysis techniques and developed a classification method that is both extremely objective and more reliable than traditional morphology-based categorisation systems. Utilising this categorisation approach, I identified three novel frog species (Hoplobatarchus litoralis, Microhyla mymensinghensis, and M. mukhlesuri) from Bangladesh. My initial identification of H. litoralis marked a novel contribution to science, occurring 150 years after the last documentation of the genus Hoplobatrachus in 1858. This research has significantly enhanced our comprehension of amphibian species diversity in Bangladesh and Southeast Asia.