title: Growth curve by Gompertz nonlinear regression model in female and males in tambaqui (Colossoma macropomum).
abstract: Was evaluated the pattern of growth among females and males of tambaqui by Gompertz nonlinear regression model. Five traits of economic importance were measured on 145 animals during the three years, totaling 981 morphometric data analyzed. Different curves were adjusted between males and females for body weight, height and head length and only one curve was adjusted to the width and body length. The asymptotic weight (a) and relative growth rate to maturity (k) were different between sexes in animals with ± 5 kg; slaughter weight practiced by a specific niche market, very profitable. However, there was no difference between males and females up to ± 2 kg; slaughter weight established to supply the bigger consumer market. Females showed weight greater than males (± 280 g), which are more suitable for fish farming purposes defined for the niche market to larger animals. In general, males had lower maximum growth rate (8.66 g / day) than females (9.34 g / day), however, reached faster than females, 476 and 486 days growth rate, respectively. The height and length body are the traits that contributed most to the weight at 516 days (P <0.001).
authors.affiliation: Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil.
authors.forename: Fernanda
authors.initials: F
authors.lastname: De Mello
authors.affiliation: Departamento de Zootecnia, Universidade Estadual de Maringá, Maringá, PR, Brazil.
authors.forename: Carlos A L
authors.initials: CA
authors.lastname: Oliveira
authors.affiliation: Departamento de Zootecnia, Universidade Estadual de Maringá, Maringá, PR, Brazil.
authors.forename: Ricardo P
authors.initials: RP
authors.lastname: Ribeiro
authors.affiliation: Embrapa Pantanal, Corumbá, MS, Brazil.
authors.forename: Emiko K
authors.initials: EK
authors.lastname: Resende
authors.affiliation: Faculdade de Medicina Veterinária e Zootecnia, Universidade Federal do Mato Grosso do Sul, Campo Grande, MS, Brazil.
authors.forename: Jayme A
authors.initials: JA
authors.lastname: Povh
authors.affiliation: Departamento de Zootecnia, Universidade Estadual de Maringá, Maringá, PR, Brazil.
authors.forename: Darci C
authors.initials: DC
authors.lastname: Fornari
authors.affiliation: Departamento de Zootecnia, Universidade Estadual de Maringá, Maringá, PR, Brazil.
authors.forename: Rogério V
authors.initials: RV
authors.lastname: Barreto
authors.affiliation: Faculdade de Medicina Veterinária e Zootecnia, Universidade Federal do Mato Grosso do Sul, Campo Grande, MS, Brazil.
authors.forename: Concepta
authors.initials: C
authors.lastname: McManus
authors.affiliation: Faculdade de Medicina Veterinária e Zootecnia, Universidade Federal do Mato Grosso do Sul, Campo Grande, MS, Brazil.
authors.forename: Danilo
authors.initials: D
authors.lastname: Streit
mesh_terms: D000818:Animals; D001938:Brazil; D060125:Characiformes / Q000145:classification / Q000254:growth & development*; D005260:Female; D008297:Male; D008954:Models, Biological; D012737:Sex Factors