Cultivo de tambaqui em canais de abastecimento sob diferentes densidades de peixes

Abstract

RESUMOA piscicultura moderna baseia-se no melhor sistema de criação, qualidade ambiental e ganhos de produtividade. Neste experimento foi analisado o efeito da densidade de cultivo na qualidade da água, e posteriormente, no desempenho zootécnico dos tambaquis (Colossoma macropomum). Os juvenis de tambaqui com 13,6 ± 4,1g de peso médio foram mantidos em canais de abastecimento com 40 metros de extensão, dividido em quinze seções de um metro cúbico. Foram testadas três densidades (60, 90 e 120 peixe m -³) em delineamento experimental inteiramente casualizado, com cinco repetições. Os resultados dos parâmetros físico-químicos da água foram: temperatura variou de 28,0-31,7 °C, o oxigênio dissolvido de 5,9-7,4 mg L -1 , o pH de 6,8-7,5, a concentração média de amônia ficou ao redor de 0,1-0,3 mg L -1 . Os valores de alcalinidade e dureza foram de 24,0-34,0 mg L -1 (CaCO 3 ) e 24,0-37,0 mg L -1 (CaCO 3 , MgCO 3 ). A condutividade elétrica variou entre 0,07-106 µS cm -1 e a concentração do total de sólidos dissolvidos ficou entre 18,37-53,00 mg L -1 . Já o ganho de peso final foi de 35,76, 32,95 e 36,25 g para as densidades de 60, 90 e 120 peixes m -3 , respectivamente, não sendo verificadas diferenças significativas nos tratamentos avaliados. Os dados do presente estudo abrem precedentes para que cultivo de peixes em canais de irrigação possa ser integrado com outras culturas, maximizando o uso da água. PALAVRAS-CHAVE: Piscicultura em canais, Qualidade da água, Colossoma macropomum. Tambaqui farming in irrigation channels under different fish densities ABSTRACTModern fish farming is based upon best-practice breeding technology, environmental quality and productivity benefit. In this experiment we analyzed fish density effects on water quality, and afterwards on breeding efficiency of Tambaqui (Colossoma macropomum). Juveniles with an average weight of 13,6 ± 4,1 g were reared in 40 m long irrigation channels, which were divided in 15 sections of 1 m³ in each case. Three fish densities (60, 90 and 120 individuals per m³) were tested, with five replications. Water quality parameters were as follows: water temperature 28,0-31,7 °C, dissolved oxygen 5,9-7,4 mg L -1 , pH 6,8-7,5, ammonium concentration 0,1-0,3 mg L -1 , alkalinity 24,0-34,0 mg L -1 (CaCO 3 ), hardness 24,0-37,0 mg L -1 (CaCO 3 , MgCO 3 ), conductivity 0,07-106 µS cm -1 and total dissolved solids 18,37-53,00 mg L -1 . The increase in fish weight was 35,76, 32,95 and 36,25 g for fish density of 60, 90, and 120 individuals per m³, respectively. No difference among fish density was observed. In conclusion, there is the possibility of integrating the fish farming with other cultures, maximizing the use of water resources.

Effect of stocking density on economic performance for Colossoma macropomum (Cuvier, 1816), juvenile in earthen ponds

“…Also when is calculate the FCR not is considered that fish has more humidity that feed, thus the value of FCR is less that one. Similar results were found in the literature for Gadus morhua farming, whith value varied between 0.7 to 1.0 (Bjornsson et al, 2012), for tambaqui reared in cages that varied between 0.92 and 1.27 (Brandão et al, 2004) and for tambaqui reared in irrigation channels under differents densities, with values between 0.96 and 1.05 (Silva et al, 2013). However, the results differed from those reported by Arbelaez-Rojas et al (2002) for tambaqui grow-out phase, which were 1.35 and 1.80 when farmed in excavated ponds and stream channels, respectively.…”

“…However, none of these factors were observed in this work, showing that in addition to meeting the requirements of the species regarding feed quality and quantity, the growing conditions was also appropriate. As well as the work of Silva et al (2013), who noted there influenciencia of stocking density in tambaquis that were in good growing conditions. The low FCR values found for tambaqui in this work, is because the fingerlings has a greater efficiency in turning food into muscle, justifying lower FCR values during rearing and spawning phases compared to the grow-out.…”

Adaptative processes, control measures, genetic background, and resilience of malaria vectors and environmental changes in the Amazon region

“…In this new scenario of environmental change, public health policy measures are insufficient for understanding and addressing the effects of climate change on the adequate control of malaria vectors (WHO, 2014). Figure 1 outlines the relationships among environmental change, anthropogenic activities, and the dynamics of malaria transmission in the Amazon ecosystem, a region where 99.8% of the malaria cases in Brazil occur and where there is an average annual temperature of 26.5°C and relative humidity of 88% (Ab'Saber, 2002;Silva et al, 2013).…”

“…The Western Amazon region has natural characteristics favorable for the development of fish farming: clayey yellow latosol soil, annual rainfall approximately 2,400 mm, average temperature of 26.5°C, 88% relative humidity, and average daily sunshine of 5.4 h (Ab 'Saber, 2002;Silva et al, 2013). With these favorable conditions, along with government encouragement, there has been a 62% growth in the issuance of licenses for fish farmers, with a current output of 15,000 tons/year, and the projection is 100,000 tons of fish/year in about one decade (SEPROR, 2014).…”

Esfirra De Goma De Tapioca E Batata Com Casca Recheada Com Tambaqui

“…O tambaqui (Colossoma macropomum) é um peixe muito encontrado na América do Sul como peixe de cultivo, principalmente na região norte, onde é consumido em larga escala. Por ser uma espécie de fácil adaptação, é facilmente encontrado nas regiões Norte e Nordeste (SILVA et al 2013). …”