Journal
VETERINARY RESEARCH COMMUNICATIONS
Volume 46, Issue 1, Pages 9-25Publisher
SPRINGER
DOI: 10.1007/s11259-021-09872-6
Keywords
Amazonian fish; Fish farming; Nutrition; Crystalline amino acid; Blood
Categories
Funding
- Amazonas State Research Support Foundation (FAPEAM) through the project PAPAC [062.00847/2019]
- Federal Institute of Education, Science and Technology of Amazonas (IFAM) throught the project PADCIT
- Coordination for the Improvement of Higher Education Personnel (CAPES)
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This study aimed to determine the dietary lysine requirements of juvenile Colossoma macropomum tambaqui based on growth performance, hepatic and intestinal morphohistology, and hematology. The results showed that the dietary lysine level of 15.96 g/kg resulted in higher final weight and improved feed conversion ratio. The morphohistological analysis revealed changes in liver and intestinal tissues due to low levels of lysine. The study concluded that the dietary requirement for lysine for tambaqui juveniles is estimated to be 15.4 - 15.6 g/kg of diet.
This study aimed to determine the dietary lysine requirements of juvenile Colossoma macropomum tambaqui based growth performance, hepatic and intestinal morphohistology and hematology. Tambaqui were fed with levels of 6.60, 9.72, 12.84, 15.96, 19.08, and 22.20 g/kg of total lysine and those who received 15.96 g/kg dietary lysine showed higher final weight (p= 0.001) and optimized feed conversion ratio (p= 0.001). Morphohistological modifications (presence of fat droplets) were present in livers of fish fed with low levels of lysine. In the morphohistology of the intestine, the diets influenced the density of the intestinal, cell layers, height and perimeters of the villi and acid mucin secretion by the goblet cells. In the proximal intestine, mucosa layer density was greater at the level of 15.96 g/kg (p= 0.001). In the middle intestine, height (p= 0.001) and perimeter (p= 0.001) of the villi were greater at low levels of lysine (respectively, 9.72 and 12.84 g/kg dietary lysine). No differences were found for the hemoglobin, hematocrit, erythrocytes, MCV, MCH, MCHC, thrombocytes and leukocytes differentiated of fish fed with experimental diets (p>0.05). The biochemical responses were affected by the diet, both in plasma concentration (protein and cholesterol; p<0.05), and in muscle (ash and moisture; p<0.05). In conclusion, the dietary requirement for lysine for tambaqui juveniles was estimated to be 15.4 - 15.6 g/kg of diet (5.7% -5.8% dietary protein).
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