Abstract
Tambaqui (Colossoma macropomum) is among the most important fish species of the Amazon and one of the most cultivated in Brazil. In the present work we have evaluated the genetic variability of wild and captivity populations of C. macropomum. Enzymatic markers were used to estimate the genetic variability of 41 specimens from a wild group; and 30, 33 and 45 from three captivity groups, which came from Pentecostes (Ceara State), Jaboticabal (Sao Paulo State) and Itacoatiara (Amazonas State), respectively. Nine isoenzymic systems were used to evaluate the genetic variability of these populations. Using zimogram data we obtained the polymorphism level, allele number, allelic frequency, observed and expected heterozigosity, Wright F statistics (FIS, F ST), genetic distance, level of similarity and group analysis. The isoenzymic data showed that, from the nine systems, six presented polymorphic loci (Fbp-2, G6pdh-2, G6pdh-3, Pgi-1, Pgi-2 and Pgm-1). The populations from Pentecostes and Jaboticabal presented loss of genetic variability and low heterozigosity, compared to the wild population and to the artificial population acquired at Itacoatiara fish farm. Based on these results and on fish farmer information we could consider the population from Itacoatiara as recently derived from a wild population. Concluding, we suggest that the artificial populations of tambaqui, which contain animals originated from this funding population at Pentecostes, should be renewed with the introduction of a new group of individuals with genetic variability equivalent to the wild population.
Highlights
Fish culture is a branch of agribusiness and has been growing in Brazil
The idea of creating fish artificially became stronger since the Maringá, v. 34, n. 2, p. 191-197, Apr.-June, 2012 environmental stocks of these commercially valuable fishes decreased by overfishing (VAL; ALMEIDAVAL, 1995)
Wild population of Colossoma macropomum was collected in the Lake Catalão, nearby the city of Manaus – AM (41 specimes – wild populations)
Summary
Fish culture is a branch of agribusiness and has been growing in Brazil. The reason for this phenomenon is the decrease of environmental stocks of the main species with commercial value. Within the natural species found in the Brazilian watershed, we can emphasize the tambaqui. 191-197, Apr.-June, 2012 environmental stocks of these commercially valuable fishes decreased by overfishing (VAL; ALMEIDAVAL, 1995). This idea has been contributing for the raise of aquaculture intake in the global production of fish and is becoming an alternative to the increase of food production of aquatic origin (ARBELÁEZROJAS et al, 2002)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
