title: Effect of high levels of dietary vitamin C on the blood responses of matrinxã (Brycon amazonicus).
abstract: Juvenile matrinxã (Brycon amazonicus) were fed with different dietary vitamin C (ascorbic acid or AA) concentrations for 2 months in order to evaluate its effect on the physiological condition of this species. Five treatments were tested: Reference diet-RD (350 mg AA kg(-1) and 45% crude protein commercial feed); C400, C500, C600 and C800 with supplementation of 400, 500, 600 and 800 mg AA kg(-1). Fish fed 800 mg AA kg(-1) supplemented diets presented greater weight gain and survival. Hematocrit, hemoglobin concentrations and erythrocytes showed significant increase (p<0.05) in C600 and C800 relatively to the others. Total leukocyte values were significantly higher in fish fed vitamin C supplemented diets relatively to those fed RD and leukocytes count of C600 and C800 were the highest among the treatments. Monocytes were the only cells of fish defense mechanism that presented variation, and C600 and C800 presented the lowest values (P<0.05). Glucose level was significantly different relatively to RD only in C400 and the plasmatic total protein values for fish fed vitamin C supplemented diets were higher than for fish fed the RD. Fish plasmatic ions (Na(+) and Cl(-)) were significantly lower for C500, C600 and C800 relatively to C400 and RD. The physiological profile and the growth performance of matrinxã suggest that diet supplemented with 800 mg AA kg(-1) can improve its performance and increase the survival rate.
authors.affiliation: Department of Aquaculture, INPA (Amazonian National Research Institute), Av. André Araújo, 2936, P.O. Box 478, Manaus, AM, 69.060-001, Brazil. pgusmao@inpa.gov.br
authors.forename: Elizabeth Gusmão
authors.initials: EG
authors.lastname: Affonso
authors.forename: Elisângela da Costa
authors.initials: Eda C
authors.lastname: Silva
authors.forename: Marcos
authors.initials: M
authors.lastname: Tavares-Dias
authors.forename: Glauber Cruz
authors.initials: GC
authors.lastname: de Menezes
authors.forename: Cristiane Suely Melo
authors.initials: CS
authors.lastname: de Carvalho
authors.forename: Erica da Silva Santiago
authors.initials: Eda S
authors.lastname: Nunes
authors.forename: Daniel Rebelo
authors.initials: DR
authors.lastname: Ituassú
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Roubach
authors.forename: Eduardo Akifumi
authors.initials: EA
authors.lastname: Ono
authors.forename: Jorge Daniel Indrusiak
authors.initials: JD
authors.lastname: Fim
authors.forename: Jaydione Luiz
authors.initials: JL
authors.lastname: Marcon
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology*; D001773:Blood Cells / Q000166:cytology / Q000187:drug effects; D001786:Blood Glucose / Q000032:analysis; D001798:Blood Proteins / Q000032:analysis; D001835:Body Weight / Q000187:drug effects; D048429:Cell Size / Q000187:drug effects; D019587:Dietary Supplements; D004906:Erythrocyte Count; D005399:Fishes / Q000097:blood*; D006400:Hematocrit; D006454:Hemoglobins; D007958:Leukocyte Count
chemical_list: D001786:Blood Glucose; D001798:Blood Proteins; D006454:Hemoglobins; D001205:Ascorbic Acid