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Abstract
The objective of this study was to obtain the growth curve of selectively bred tambaqui (Colossoma macropomum) reared in different environments. The experiment was carried out in the municipalities of Santo Antônio de Leverger (Mato Grosso – MT) and Campo Grande (Mato Grosso do Sul – MS), Brazil, over 431 days. Weight and morphometric traits of two families (A and B) from the second generation of selective breeding (G2) were measured every 30-45 days. The Gompertz regression model was used to obtain the growth curves. The production performance of both families and the interaction between families and locations (genotype × environment) were evaluated by analysis of variance considering the family (A and B), location (MT and MS), family × location interaction and error as variation factors. The asymptotic value (parameter A) obtained for weight and morphometric traits (except head length) was higher (P<0.05) in MT (weight of families A and B: 2279.6 g) than in MS (weight of family A: 1400.0 g; weight of family B: 1600.0 g). Family B showed better production performance in MS. There was a genotype × environment interaction effect on weight, body length and standard length. The two families have distinct growth patterns in different production environments. Family B has better growth performance in the environment with lower temperatures (MS).
Highlights
Tambaqui, Colossoma macropomum (Cuvier, 1818), a member of the order Characiformes, family Characidae and sub-family Myleinae, is a fish species native to the Amazon basin and widespread in tropical parts of South America and Central Amazon (Araújo-Lima and Goulding, 1998)
Hybrid fish may have a higher yield potential than their parents, this gain is restricted to a single generation, where as the genetic gain achieved with selective breeding continues throughout subsequent generations (Ponzoni et al, 2005)
All animal procedures were approved by the Ethics Committee on Animal Use of the Federal University of Mato Grosso do Sul (CEUA/UFMS/641/2014)
Summary
Colossoma macropomum (Cuvier, 1818), a member of the order Characiformes, family Characidae and sub-family Myleinae, is a fish species native to the Amazon basin and widespread in tropical parts of South America and Central Amazon (Araújo-Lima and Goulding, 1998). The lack of native fish breeding programs in Brazil has led many fish farmers to produce hybrid fish in an effort to increase their production. Notable examples of such hybrids are tambacu (female tambaqui * male pacu) and tambatinga (female tambaqui ×male pirapitinga) (Lopera-Barrero et al, 2011). Hybrid fish may have a higher yield potential than their parents, this gain is restricted to a single generation, where as the genetic gain achieved with selective breeding continues throughout subsequent generations (Ponzoni et al, 2005). Gains of 8-12% can be obtained per generation in well-managed programs (Nguyen, 2016), possibly reaching up to 15% (Ponzoni et al, 2005)
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