A aquaponia é uma modalidade de produção de alimentos que integra a aquicultura e a hidroponia num sistema fechado de recirculação de água e nutrientes. Esta atividade é uma alternativa viável para a produção sustentável de alimentos onde o abastecimento de água é mínimo, tornando seu uso mais eficiente por pequenos produtores ou em regiões com déficit de uso da água. Este estudo avaliou o crescimento do tambaqui (Colossoma macropomum) associado à hidroponia durante um período de 110 dias, quanto ao ganho de peso, a conversão alimentar e a sobrevivência dos peixes, os quais apresentaram comprimento e peso final de 15,5 ± 1,09 cm e 67,78 ± 13,86 g, respectivamente, na densidade de 50 peixes m-³. O consumo de ração total foi de 7,0 kg, a conversão alimentar foi de 1,8 e a biomassa final foi de 3,86 kg m-³. A sobrevivência foi de 100%. A qualidade da água se manteve ideal para o desenvolvimento do tambaqui. Em relação à planta, no período de 40 dias, a quantidade de nutrientes produzidos a partir dos resíduos da água de criação na fase de alevinagem não foi satisfatória para o desenvolvimento da alface. Conclui-se que o sistema de aquaponia pode assegurar um desenvolvimento sustentável na criação do tambaqui nas fases de alevinagem e recria em relação à qualidade da água e desempenho, entretanto, em relação à alface um maior aporte de nutrientes deverá ser suplementado para assegurar um bom desenvolvimento das plantas.
In a quantitative field research, the objective of this work was to determine the best stocking density for tambatinga juveniles (Colossoma macropomum × Piaractus brachypomus) in a recirculation system during 50 days of cultivation. Tambatinga juveniles (0.72±0.02 g) were distributed in 0.08 m3 polyethylene boxes with densities of 5, 10 and 15 fish/box, with five replicates per treatment. During the experimental period, water quality, weight gain, apparent feed conversion, specific growth rate, carcass yield, proximate composition and final survival were evaluated. The water parameters remained stable and in the desired range for the species during the experimental period (temperature 25±1.52° C, pH 5.85±0.7 and dissolved oxygen 6.51±0.05 mg L-1). Statistical analyzes showed no significant difference for apparent feed conversion and survival rate. The lowest stocking density (5 fish/box) showed greater weight gain and specific growth rate, while the density of 10 fish/box showed high lipid deposition in the carcass. Aiming at greater weight gain and better specific growth rate, the results indicated that the density of 5 fish/box (0.08 m3), is the most suitable for juveniles of this species.
Lectins are a heterogeneous group of proteins that reversibly bind to simple sugars or complex carbohydrates. The plant lectin purified from the seed of Parkia platycephala (PPL) was studied. This study aimed to investigate the possible orofacial antinociceptive of PPL lectin in adult zebrafish and rodents. Acute nociception was induced by cinnamaldehyde (0.66 μg/mL), 0.1% acidified saline, glutamate (12.5 µM) or hypertonic saline (5 M NaCl) applied into the upper lip (5.0 µL) of adult wild zebrafish. Zebrafish were pretreated by intraperitoneal injection (20 µL) with vehicle (Control) or PPL (0.025; 0.05 or 0.1 mg/mL) 30 min before induction. The effect of PPL on zebrafish locomotor behaviour was evaluated in the open field test. Naive groups were included in all tests. In one experiment, animals were pre-treated with capsazepine to investigate the mechanism of antinociception. The involvement of central afferent C-fibres was also investigated. In another experiment, rats pre-treated with PPL or saline were submitted to the temporomandibular joint formalin test. Other groups of rats were submitted to infraorbital nerve transection to induce chronic pain, followed by induction of mechanical sensitivity using von Frey. PPL reduced nociceptive behaviour in adult zebrafish, and this is related to the activation of the TRPV1 channels since antinociception was effectively inhibited by capsazepine and by capsaicin-induced desensitization. PPL reduced nociceptive behaviour associated with temporomandibular joint and neuropathic pain. The results confirm the potential pharmacological relevance of PPL as an inhibitor of orofacial nociception in acute and chronic pain.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.