Influência da frequência alimentar durante a alevinagem do pacamã (Lophiosilurus alexandri) Frequency of feeding for fingerlings pacamã (Lophiosilurus alexandri
O levantamento da qualidade de água pode ser um indicador que auxilia o diagnóstico ambiental de recursos hídricos necessários em ambiente periurbano. O presente trabalho teve como objetivo avaliar a qualidade microbiológica da água de nascente localizada no córrego Siriema (setor intermediário) no município de Jandaia do Sul-Paraná. Em campo, foi coletado amostra de água da nascente na margem direita (23º 35' 18" S e 51º 38' "22 O), situada na região próxima à rua. A análise
- An experiment lasting 180 days was carried out to evaluate the influence of sex on the performance and production of silver catfish (Rhamdia quelen) when reared in closed recirculation systems using only males, only females, or with both genders. A total of 300 fish (41.49 ± 6.82 g and 16.53 ± 0.95 cm) were used, comprising 150 females and 150 males distributed in an experimental structure consisting of three closed water recirculation systems coupled to a 20,000 L culture tank and a 20,000 L biofiltration tank connected by a 3,500 L h-1 water pump. The first system contained 100 females, the second, 100 males, and the third, 50 females and 50 males. High fish weight variations were observed regardless of sex. Female weight gains and specific growth rates were 41.51 % and 28.94 % higher compared to males, respectively, exhibiting greater growth than males raised monosexually or in mixed rearing systems, with no effect on chemical composition or trunk yield. The findings thus indicate that both male and female silver catfish exhibit wide weight variations and females that gain more biomass than males reared monosexually or in mixed-sex systems.
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Brazilian agriculture has undergone important changes since the 1960s, where public policies were responsible for building an institutional environment favourable to innovation and knowledge and technology adaptation (Vieira Filho & Fishlow, 2017). This has, in turn, led to dramatic increases in agricultural production (Schulter & Filho, 2017).Food security concerns and a growing interest in environmental sustainability are among the main challenges to be faced by countries in the coming decades, due to worldwide population growths (Schulter & Filho, 2017;Vieira Filho & Fishlow, 2017). The productive efficiency of agricultural activities, however, still requires improvements, driven by exponential food demand increases by the world's population (Food and Agriculture Organization of the United Nations [FAO], 2017). In this context, aquaculture has contributed effectively to animal production worldwide, displaying the greatest development in recent years among agricultural activities (FAO, 2020).It is estimated that the global fish production reached 179 million tons in 2018, of which 156 million were destined for human
Avaliar o efeito da inclusão de níveis crescentes da farinha de folha da amoreira (Morus alba) em rações para a tilápia do Nilo (Oreochromis niloticus) em crescimento, entre 120 - 600g de peso vivo. Durante 90 dias, no Laboratório de Tecnologia em Aquicultura – LATAq da Universidade Federal do Paraná, Campus Avançado de Jandaia do Sul/PR. Foram utilizados 100 individuos, sexualmente revertidas, com peso inicial 120,97 ± 35,84g, com delineamento inteiramente casualizado com 5 tratamentos e 20 repetições, foi considerado cada peixe como repetição. Os tratamentos foram constituídos pela inclusão da farinha da folha da amoreira (FFA) nos níveis (0,0; 5,0; 10,0; 15,0 e 20,0%). Não foram verificados efeito dos tratamentos (p>0,05) sobre as variáveis: peso final, rendimento de carcaça e filé, ganho de peso, conversão alimentar, comprimento de total, padrão e cabeça, largura da cabeça. A inclusão da FFA influenciou (p<0,05) na largura do tronco, altura da cabeça e percentagem de extrato etéreo corporal. A inclusão da FFA em rações para tilápia do Nilo em crescimento pode ser feita em até 20% sem impacto negativo no desempenho.
The present work is aimed to determine the best feeding level to pacamã (Lophiosilurus alexandri) fingerlings at performance, survival, and body parameters. One hundred One hundred and twenty five fingerlings with mean body weight of 3.57±0.05g were used and distributed in a completely randomized design with five treatments and four replicates during 30 days. The treatments were five feeding levels: 3, 6, 9, 12, and 15% of body weight day-1 of to pacamã fingerlings fish, were feeding twice times daily, 08h00 and 18h00. The diet contained 57,28% crude protein and 3.405,98 Kcal kg-1 gross energy. Water temperature ranging of 27.3°C to 28.6°C, and dissolved oxygen was 5.0 mg/L. A quadratic effect (P<0.01) was observed to final weight, weight gain, specific growth rate, and final length. Survival, carcass yield, carcass without head yield, height, head length parameters no showed difference (P>0.05) in function of feeding level. Feeding level of 9.5 % of body weight is recommending to pacamã fingerlings.
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