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Articles by Md. Shahjahan
Total Records ( 2 ) for Md. Shahjahan
  Ainun Nur Jyoti , Md. Parvez Anwar , Sabina Yeasmin , Md. Delwar Hossain , A.U.M. Mohai Minur Rahman , Md. Shahjahan and A.K.M. Mominul Islam
  Background and Objective: The productivity of rice-fish culture mostly depends on the nutrient management and proper fish species selection. A study was conducted to evaluate the effect of plant nutrient management on the productivity of rice-fish culture. Materials and Methods: High yielding Boro rice variety BRRI dhan 29 was used in this study. Factors included 6 different plant nutrient management viz. (1) No fertilizer/manure, (2) Recommended fertilizer (RF) for rice, (3) 75% RF, (4) Compost at the rate of 10 t ha1 and (5) Compost at the rate of 5 t ha1+75% RF, (vi) Compost at the rate of 5 t ha1+50% RF and 3 fish species such as (1) No fish, (2) Tilapia and (3) Common carp. Results: Rice plant growth was significantly affected by nutrient management but not by fish species. All the yield parameters were influenced by nutrient management but only grains/panicle was influenced by fish species. Recommended fertilizer resulted in the highest grain weight/hill. Integration of fish with rice resulted in higher grain weight/hill of rice compared to rice sole culture. Rice sole culture and rice-fish culture produced similar grain yield. Tilapia yielded the highest with 75% RF+compost at the rate of 5 t ha1 (545 kg ha1) or with 100% RF (514 kg ha1). While for common carp, application of compost at the rate of 5 t ha1+50% RF yielded the highest (625 kg ha1). Conclusion: Rice-fish culture was found more remunerative than rice sole culture in terms of net return and benefit cost ratio. Therefore, considering the productivity and profitability, either tilapia or common carp can be integrated with rice following recommended fertilizer application.
  Arafat Siddiquee , Harunur Rashid , Md. Ariful Islam , Khan Kamal Uddin Ahmed and Md. Shahjahan
  The reproductive biology of an endangered fish species great snakehead (Channa marulius) was studied by gonadosomatic index (GSI) and histological analysis of ovaries and testis. Fishes were collected from the haor areas of greater Sylhet basin for a period of July 2011 to June 2012. For female the highest GSI (0.42) was in July and the lowest (0.018) was in January and March. Similarly, for male the highest GSI (0.056) was in July and the lowest (0.018) was in January. In the histological study, the premature (PM) and mature (M) stages of oocytes were observed in the ovaries of fish collected in June to July. The ovaries contained developing oocytes oogonia (OG) and perinuclear oocytes (PNO) in the August and subsequent month samples which were mostly spent. In testis high proportions of mature germ cells spermatids (SPT) and spermatozoa (SPZ) were observed in the July samples of C. marulius. In parallel to GSI, both the ovary and testis develop and mature synchronously. The present findings indicated that Channa marulius from Sylhet basin attains peak reproductive maturity in the month of June and July which revealed the breeding season of this species.
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