Abstract
This study was conducted to assess the growth performances of cage reared GIFT strain of tilapia (Oreochromis niloticus) fingerling using length-weight (LW) relationship technique. Along with this, condition factor (K) of fish and pond water quality parameters were also brought under this study to have broader understanding. For LW relationship and K, a sample size of 120 fingerlings was made from randomly selected three different cages in a pond at Tarala village in Kaharole Upazila of Dinajpur District, Bangladesh. The length-weight relationship of tilapia fingerlings reared in cages managed by Adivasi people was significant. The value of correlation coefficient (r) and the coefficient of determination (r2) were 0.97 and 0.94 respectively. This suggests that growth of tilapia from fry to fingerling was normal in cages. The condition factor of different size group of fish was almost closed to 2, indicating fish health as satisfactory. All the water quality parameters including temperature, transparency, dissolved oxygen,ammonia-nitrogen, phosphate-phosphorus, nitrate-nitrogen and pH were within suitable range both in cages and outside the cage in pond. About 5 phyla and 25 genera of phytoplankton from Bacillariophyceae, Cyanophyceae, Chlorophyceae, Euglenophyceae and Rhodophyceae groups and one phylum and 5 genera of zooplankton from Rotifera group were found in cage installed in ponds. These all indicate the growth of tilapia fingerling in cages was satisfactory which was technically sound for landless adivasi households. DOI: http://dx.doi.org/10.3329/jbau.v10i1.12107 J. Bangladesh Agril. Univ. 10(1): 149155, 2012
Highlights
Indigenous ethnic minorities live in clusters at different parts of the country and commonly known as adivasi who are reported to be vulnerable and far from the mainstream development in Bangladesh (Kamal et al 2003)
Length-weight relationship of tilapia fingerling in cage
The coefficient in the present study indicated that there was a high degree of correlation between total length and body weight, since it was close to 1, and its positive expression reflected positive slope
Summary
Indigenous ethnic minorities (about 2.5 million) live in clusters at different parts of the country and commonly known as adivasi who are reported to be vulnerable and far from the mainstream development in Bangladesh (Kamal et al 2003). There are recorded 45 tribes in Bangladesh. In the northwest Bangladesh there are about 35 adivasi tribes among of whom are the Barman, Koch, Monad, Orion, Sandal, and Rajbangshi, Munda, Paharia, Malo, Karmokar, Mahato, Rajowar, Badara, Bhumij, Bhugs, Khoira, Pal, Burma etc. The increasing trend of population growth and decreasing trend of natural resources have negatively affected adivasi’s traditional livelihoods of hunting and gathering of foods from wetlands (Haque et al 2010). Gradually changes their occupation for hunting to agriculture based day labourer. The WorldFish Center in collaboration with Caritas Bangladesh involved adivasi people in cage based fish fingerling production in northeast and northwest Bangladesh to uplift the livelihood condition of adivasi people
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