1. UKM Learning and Research Repository
2. PHD Thesis / Tesis PHD
3. Faculty of Science and Technology / Fakulti Sains dan Teknologi

Title:	Effects of temperature and diet on physiological growth of juvenile Malabar blood snapper (Lutjanus malabaricus Bloch & Schneider, 1801)
Authors:	Sabuj Kanti Mazumder (P72474)
Supervisor:	Simon Kumar Das, Dr.
Keywords:	Temperature Malabar blood snappers Diet Physiological growth Juvenile Malabar Dissertations, Academic -- Malaysia
Issue Date:	9-May-2016
Description:	Interest in the culture of Malabar blood snappers (Lutjanus malabaricus Bloch & Schneider, 1801) has developed throughout the world because of declines in wild stocks combined with a consistent high demand and market value. The objective of this study was to identify the impact of global warming and food variations in growth, condition, gastric digestion, pepsin enzyme activity, haematology and biochemical indices, oxygen consumption rates and gill morphology of this commercially important fish species. Fish were collected from local hatcheries of Pulau Ketam, Selangor, Malaysia. The experiments were conducted in the laboratory using flow through sea water aquaria and exposed to four different temperatures (22°C, 26°C, 30°C and 34°C) and two diets (commercial pellet and natural shrimp diet). Fish were reared in respective experimental tanks for a period of 30 days. The L. malabaricus exhibited isometric (b=3) and positive allometric growth (b>3) at 30oC fed with pellet and shrimp diet respectively. The rest of the temperatures represented negative allometric growth (b<3) fed with both diet. The condition factors (K and Kn) were greater than 1, indicating the wellbeing of the fish, except for those fed with pellet at 34°C. The best FCR was recorded at 30°C fed with shrimp diet (1.33±0.08). Highest growth rate was found in the 30°C fed with shrimp diet (3.97±0.57 % day-1), and the lowest at 22°C fed with pellet diet (1.63±0.29 % day-1). The data obtained from X-radiography and serial slaughtering showed that fish fed with shrimp diet exhibited fastest gastric empting time (16h) and rate (7.51±0.17), whereas a significant delay was seen in the 22°C fed with pellet diet (28h and 2.26±0.05). L. malabaricus fish mass (W, g) also incorporated into a modified square root model [St = S0 (1-S0 (α-1)ρ(1-α) t)1/(1- α) + ζ ], fit the wet mass gastric evacuation data, regardless of temperature and diet type (r2>0.99). The highest pepsin enzyme activity was observed in fishes reared in 30oC fed with shrimp diet (5.47 U mg protein-1) and the lowest was at 22oC fed with pellet diet (0.75 U mg protein-1). The haematological and biochemical parameters were found to be in normal range but changing temperature and diet led to a significant changes (P<0.05) in the parameters. Oxygen consumption rate increased significantly (P<0.05) from 0.21 to 0.47 ml O2 h-1 with increasing temperature. Maximum and minimum temperature quotients (Q10) were observed between 22-26oC and 26-30oC as 2.02 and 1.82, respectively. Final preferred temperature estimated from Q10 value was between 26-30oC. However no noticeable difference observed for qualitative study of gills by scanning electron microscope. The data obtained from this study suggested to culture L. malabaricus in 26 - 30oC fed with either pellet or shrimp diet which will optimize the overall production and condition of this commercially important fish species. These findings would also be helpful for the fishery biologists and resource managers for the conservation of this important fisheries resources by coping with global warming effects.,Certification of Master's/Doctoral Thesis" is not available
Pages:	222
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Science and Technology / Fakulti Sains dan Teknologi

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.