Evalutation of zootechnical performance of genetically improved tambaqui Colossoma macropomum (Cuvier, 1818) in central Amazonia
DOI:
https://doi.org/10.6008/CBPC2179-6858.2020.005.0022Keywords:
Growth, Tambaqui Curumim, Genetic Improvement, Fish Farming, AmazonasAbstract
Tambaqui Colossoma macropomum (Cuvier, 1818) is the main native species raised in the Brazil, representing almost 40% of the country's fish production. Genetic improvement programs for this species are being carried out in the country, especially in the Amazon region. The present study aimed to evaluate the zootechnical performance of three improved lineage and one wild tambaqui lineage over a period of 122 days, in order to obtain 500g fish, known locally as “tambaqui curumimâ€. Were used 160 juveniles, with 60 days of old, 40 fish per lineage. All fishes were identified with microchips and stored in a single 600m2 excavated pond, under the same breeding conditions, with a density of 0.26 fish.m-2. The fish were fed with commercial feed and monthly biometrics were carried out over four months. The water quality variables remained within the acceptable levels for the cultivation of the species, except for dissolved oxygen, which was on average below 5mg / L-1, during the morning periods. The improved lineage showed a significant difference in weight gain and specific growth rate. Only one lineage (C) differed in weight gain compared to wild fish. This same lineage showed the highest specific growth rate. The head length/standard length (CCAB / CP) ratio differed between the lineage, being lower in the A and wild lineage. The study show that all lineage reached an average weight of approximately 900g in 122 days of experiment, which is higher than the studies fish farming of tambaqui curumim in the same period where is reached of 500 to 700g. Regarding the zootechnical performance indexes and tambaqui morphometry, we can say that the tambaqui breeding program still needs further studies to develop lineages that obtain greater weight gain compared to wild parents, in the same breeding period.
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