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Articles by S.M. Rahmatullah
Total Records ( 2 ) for S.M. Rahmatullah
  M.M. Haque , N.T. Narejo , M.A. Salam , S.M. Rahmatullah and M.A. Islam
  A four month long experiment was conducted in earthen ponds (each of 81 m2 in size) during the month from August to November, 2001 to observe suitable stocking density of Macrobrachium rosenbergii in polyculture of Indian major carps viz. catla (Catla catla), ruhu (Labeo rohita) and mrigal (Cirrhinus mrigala). Six densities of M. rosenbergii with carps were considered as treatments. Each treatment had three replications. All the fish were same age group and mean initial weight of prawn, catla, ruhu and mrigal were 1.1± 0.12, 14.2 ± 0.52, 8.5 ± 0.16 and 11.8 ± 0.20g respectively. Water quality parameters including temperature, dissolved oxygen and pH were found in the suitable range. The best combination of prawn-carp polyculture (prawn: catla: ruhu: mrigal = 25: 15: 15: 15) was found in the treatment T3 with significantly (p<0.05) highest growth of M. rosenbergii and carps.
  N.T. Narejo , S.M. Rahmatullah and M. Mamnur Rashid
  The above experiment was conducted to study the effect of different shelters on growth, survival and production of freshwater mud eel, Monopterus cuchia reared in cemented cisterns (1.25 m2 each) over a period of 12 months from July 2001 to June 2002. Three different shelters namely Shelter 1(mud) Shelter 2 (Water hyacinth) Shelter 3 (PVC pipes) and control (without shelter) were applied to treatment I, II, III and IV, respectively with dead small fish as a food (protein 30%). Each of the cisterns was stocked with 10 fish with mean initial body weight of 35.5±2.55 g. Each treatment was replicate thrice. Significantly (p<0.05) highest weight gain (82.63±5.80 g) was obtained in treatment II followed by treatment I (53.80±0.65) and lowest weight gain (24.93±0.89 g) was observed in treatment IV. Significantly (p<0.05) highest Survival rate (100%), was observed in treatment II and lowest (50%) was in treatment IV. The highest specific growth rate (0.3290±0.0141) and production (0.945±0.046 Kg/ m2/year) were found in the treatment II and lowest specific growth rate (0.1457±0.0029) and production (0.099 Kg/m2/year) was observed in treatment IV. Weight gain was observed in all the treatments from February to November. However slight weight loss (estivation) was noted during the winter months from December to January in all treatments. Water quality parameters including temperature, dissolved oxygen, pH and alkalinity were recorded throughout the study period and were found with in the suitable range. On the basis of survival rate and production, it is suggested that the water hyacinth is a suitable shelter for the culture of M. cuchia in the cemented cisterns.
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