DSpace Collection:
http://dspace.cvasu.ac.bd/jspui/handle/123456789/46
2024-03-28T15:33:57ZGROWTH, PRODUCTIVITY, PIGMENTS AND OXIMATE COMPOSITION OF INDIGENOUS MARINE MICROALGAE ISOLATED FROM COX’S BAZAR COAST
http://dspace.cvasu.ac.bd/jspui/handle/123456789/259
Title: GROWTH, PRODUCTIVITY, PIGMENTS AND OXIMATE COMPOSITION OF INDIGENOUS MARINE MICROALGAE ISOLATED FROM COX’S BAZAR COAST
Authors: Islam, Zahidul
Abstract: Microalgal biomass has been widely reported as great source of feed, food, biodiesel, and pigments. Suitable microalgae species for particular industrial application are selected on the basis of its growth rates, productivity, and adaptability to the laboratory conditions, pigments concentrations, and proximate profiles. Understanding the growth pattern of microalgae is crucial because it is the primary steps for any kind of operational procedure mostly biomass extractions. Present study focused on four different indigenous microalgae species (Chlorella sp., Chaetoceros sp., Nannochloropsis sp., and Tetraselmis sp.) to determine their growth, productivity, pigments and proximate composition. Experimental species were collected from previously preserved sample (isolated from Cox’s Bazar coast) of Department of Aquaculture, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University. Selected species were cultured in commercial Conway culture medium. Biomass was harvested at their stationary phase for each species for further analysis. Result indicated distinct growth phase for each species in terms of cell density and optical density which were significant at 1% level of significance. In addition, Chaetoceros sp. showed significantly (p < 0.05) higher volumetric productivity (0.61 ± 0.08 mg/L/Day), areal productivity (1.2 ± 0.17 mg/cm2/Day), and lipid productivity (0.109 ± 0.003 mg/L/Day) compare to Chlorella sp., Nannochloropsis sp., and Tetraselmis sp. On the other hand, Tetraselmis sp. produced significantly highest amount of chlorophyll a and b (2.68 ± 0.04 μg/L, 1.23 ± 0.02 μg/L) where Chaetoceros sp. produced (0.29 ± 0.01 μg/L) highest amount in case of chlorophyll c. Moreover, in case of carotenoids Nannochloropsis sp. content (1.68 ± 0.05 μg/mL) significantly (p < 0.05) higher amount compares to Tetraselmis sp. (1.51 ± 0.14 μg/mL), Chaetoceros sp. (1.36 ± 0.2 μg/mL), and Chlorella sp. (0.56 ± 0.03 μg/mL). In addition, allophycocyanin reported highest amount in all the four species rather than phycocyanin and phycoerythrin. However, Nannochloropsis sp. content significantly (p < 0.05) higher amount of phycobiliproteins than other three species (Tetraselmis sp., Chlorella sp., and Chaetoceros sp.). Besides, the results of proximate composition in this study showed that, Tetraselmis sp. content significantly (p < 0.05) higher amount of protein (57 ± 0.66% dry weight), Nannochloropsis sp. content significantly (p < 0.05) higher amount of lipid (25 ± 1.84% dry weight), whereas Chlorella sp. content significantly (p < 0.05) higher amount of carbohydrate (23 ± 1.62% dry weight) among all other
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species. For the production of valuable biomass quality microalgae are potential candidates because of their easy culture system, and capability to grow in low cost media. In that way the production cost and contamination risk also decrease. Therefore, proper selection of microalgae’ species through proper characterization is necessary for various industries.2020-06-01T00:00:00ZPOTENTIALITY OF Nannochloropsis sp. AS PARTIAL DIETARY REPLACEMENT OF FISHMEAL ON GROWTH, NUTRITIONAL PROFILE, PIGMENT, ANTIOXIDANTS AND BREEDING PERFORMANCE OF GUPPY (Poecilia reticulata
http://dspace.cvasu.ac.bd/jspui/handle/123456789/185
Title: POTENTIALITY OF Nannochloropsis sp. AS PARTIAL DIETARY REPLACEMENT OF FISHMEAL ON GROWTH, NUTRITIONAL PROFILE, PIGMENT, ANTIOXIDANTS AND BREEDING PERFORMANCE OF GUPPY (Poecilia reticulata
Authors: Sultana, Razia
Abstract: In this study, fishmeal was partially replaced by Nannochloropsis sp. to evaluate its effect on growth, survival, proximate composition, pigment, antioxidants, breeding performance and water quality parameters in rearing guppy (Poecilia reticulate). Triplicate groups of fifteen uniform sized guppy fries were kept in each rectangular glass tank (20 L) maintaining the male and female ratio to 1:2. In diets, Nannochloropsis sp. was incorporated by replacing fishmeal at different levels-0 (control), 5 (N5), 10 (N10) and 15% (N15) and commercial feed (CMF) and fed to the fishes, twice a day at 5% of their body weight for 100 consecutive days. At the end of experiment, random sampling of fishes was done for growth parameter assessment and further laboratory analysis. Results showed that the lipid profile was significantly (P < 0.05) higher in 15% inclusion of Nannochloropsis sp. whereas there were no significant (P > 0.05) differences in protein and carbohydrate content in all groups. However, feed conversion ratio, specific growth rate, average daily growth, length increment and condition factor were relatively similar in all the groups except 15% and commercial feed. The carotenoid content of fin and muscle was significantly (P < 0.05) higher in 15% inclusion. In addition, the fish in 15, 10, and 5% inclusions performed significantly (P < 0.05) earlier breeding with a higher number of offspring, respectively than the control and commercial feed fed groups. Statistical analysis of the collected data also revealed that there was significant differences among treatments regarding survival and oxidative stress analyzed by hydrogen peroxide and lipid peroxidation assays. Survival rate was significantly (P < 0.05) higher in algal feed fed groups (N15, N10, and N5). H2O2 was significantly (P < 0.05) lower in N15 compared to the other groups whereas lipid peroxidation was lower in both N15 and N10. The addition of Nannochloropsis sp. to the feed improved and maintained good water quality during the culture period. In conclusion, results from this study indicate that selected marine microalga can improve reproductive performance through enhancing body coloration and lipid content of fish as well improving their survival rate with higher antioxidant properties might help in production of more hardy culture species for commercial aqua farming.2021-06-01T00:00:00Z