RESUMO
World fish production are growing about 10% a year and Brazil presents potential to be the first one in fish production until 2030. However, intensification of aquaculture production systems expose fish to numerous stressors such as poor water quality, crowding, handling and transport which may negatively affect their growth and and limit profitability of aquaculture systems. This current setup favors the use of dietary prebiotics for management of farmed fish as environmentally friendly practice. This study was set out to determine de effects of increasing levels of mannanoligosccharides (MOS) on growth of juvenile Nile tilapia (Oreochromis niloticus). Fish (12.62 ± 0.38 ) were randomly distributed into 16 cages (0.25m3 polyvinyl chloride; 20 fish per cage), inside four 5m3 net-cage at Salto Caxias Hydroeletric water reservoir (Boa Vista da Aparecida, PR). Fish were fed during 60 days with a commercial diet (32%CP) supplemented with 0.0 (control); 0.2; 0.4 and 0.8% dietary MOS (n=4). Water quality parameters (temperature, pH and dissolved oxygen) were monitored during trial. After 60 days feeding trial, fish were fasted for 24 hours and sedated for biometrical parameters to evaluate growth parameters. It was observed no influence (p>0.05) of MOS supplementation on Nile tilapia growth parameters (weight gain, feed conversion rate, specific growth rate) as well as for hepatos
O artigo não apresenta resumo em português.
RESUMO
Intensification of aquaculture production systems exposes fish to numerous stressors, which may negatively affect their growth and limit profitability of aquaculture systems. In addition, fish farmers are now obliged to conform to Best Management Practices (BPMs) regulations. This current setup favors the use of dietary prebiotics for management of farmed fish as environmentally friendly practice. Mannanoligosaccharides (MOS) are complex carbohydrates derived from yeast (Saccharomyces cerevisiae) cell walls. This study was set out to evaluate the effects of increasing levels of dietary MOS on intestinal morphology of Nile-tilapia. Fish (12.62 ± 0.38 ) were randomly distributed into 16 cages (0.25m3 polyvinyl chloride; 20 fish per cage), inside four 5m3 net-cage at Salto Caxias Hydroeletric water reservoir (Boa Vista da Aparecida, PR) and fed diets containing increasing levels of MOS (0.0; 0.2; 0.4 and 0.8%) during 30 days (n=4). The proximal intestine fragment of two specimens from each replicate was taken for histological observations. The histological sections (5 m) were stained with haematoxylin and eosin (H & E) and documented photographically with a digital camera (DCM 130E digital camera for microscope 1.3 pixels, CMOS chip Software Scopephoto) connected to a light microscope (EDUTEC 502 AC). The images were analyzed by using (BEL Eurisko) software for intestinal vil
O artigo não apresenta resumo em português.
RESUMO
Intensification of aquaculture production systems exposes fish to numerous stressors, which may negatively affect their growth and limit profitability of aquaculture systems. In addition, fish farmers are now obliged to conform to Best Management Practices (BPMs) regulations. This current setup favors the use of dietary prebiotics for management of farmed fish as environmentally friendly practice. Mannanoligosaccharides (MOS) are complex carbohydrates derived from yeast (Saccharomyces cerevisiae) cell walls. This study was set out to evaluate the effects of increasing levels of dietary MOS on intestinal morphology of Nile-tilapia. Fish (12.62 ± 0.38 ) were randomly distributed into 16 cages (0.25m3 polyvinyl chloride; 20 fish per cage), inside four 5m3 net-cage at Salto Caxias Hydroeletric water reservoir (Boa Vista da Aparecida, PR) and fed diets containing increasing levels of MOS (0.0; 0.2; 0.4 and 0.8%) during 30 days (n=4). The proximal intestine fragment of two specimens from each replicate was taken for histological observations. The histological sections (5 m) were stained with haematoxylin and eosin (H & E) and documented photographically with a digital camera (DCM 130E digital camera for microscope 1.3 pixels, CMOS chip Software Scopephoto) connected to a light microscope (EDUTEC 502 AC). The images were analyzed by using (BEL Eurisko) software for intestinal vil
O artigo não apresenta resumo em português.
RESUMO
World fish production are growing about 10% a year and Brazil presents potential to be the first one in fish production until 2030. However, intensification of aquaculture production systems expose fish to numerous stressors such as poor water quality, crowding, handling and transport which may negatively affect their growth and and limit profitability of aquaculture systems. This current setup favors the use of dietary prebiotics for management of farmed fish as environmentally friendly practice. This study was set out to determine de effects of increasing levels of mannanoligosccharides (MOS) on growth of juvenile Nile tilapia (Oreochromis niloticus). Fish (12.62 ± 0.38 ) were randomly distributed into 16 cages (0.25m3 polyvinyl chloride; 20 fish per cage), inside four 5m3 net-cage at Salto Caxias Hydroeletric water reservoir (Boa Vista da Aparecida, PR). Fish were fed during 60 days with a commercial diet (32%CP) supplemented with 0.0 (control); 0.2; 0.4 and 0.8% dietary MOS (n=4). Water quality parameters (temperature, pH and dissolved oxygen) were monitored during trial. After 60 days feeding trial, fish were fasted for 24 hours and sedated for biometrical parameters to evaluate growth parameters. It was observed no influence (p>0.05) of MOS supplementation on Nile tilapia growth parameters (weight gain, feed conversion rate, specific growth rate) as well as for hepatos
O artigo não apresenta resumo em português.