https://www.alice.cnptia.embrapa.br/alice/handle/item/88 Artigo em periódico indexado (CPAF-AP) Wed, 06 May 2026 04:02:50 GMT 2026-05-06T04:02:50Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186350 Título: Whole-fish body elemental composition as biomarker of bacterial infections in wild Gambusia holbrooki. Autoria: CANO-ROCABAYERA, O.; SANTOS, Y.; ARAUJO, R. M.; SALVADÓ, H.; WEBSTER, G.; PACHECO, M.; TAVARES-DIAS, M.; RIBAS, A.; MACEDA-VEIGA, A. Conteúdo: Infectious agents shape fish populations by inducing lethal and sublethal changes that alter nutrient metabolism and metal bioaccumulation. These shifts can manifest as changes in the ionome—the specific combination of essential and non-essential chemical elements defining the whole-body composition of an individual. Understanding how pathogens shape the fish ionome is critical for developing advanced monitoring tools and clarifying the ecological roles of hosts and their pathogens. This study reports the first documented outbreak of Citrobacter freundii, Pseudomonas aeruginosa, Pseudomonas mosselii, and Shewanella xiamenensis bacterial infections in wild-caught eastern mosquitofish (Gambusia holbrooki) from three populations in Extremadura, southwestern Spain. Under laboratory-controlled conditions, we established associations between these bacterial outbreaks and the whole-fish body ionome of G. holbrooki. We compared 19 chemical elements and seven elemental ratios among diseased fish, healthy fish at the outbreak, and individuals fully recovered 100 days post-infection following antibiotic treatment. The fish ionome clearly discriminated between diseased and healthy states, and the response was consistent across all three populations. Our findings support the utility of whole-fish body elemental composition in G. holbrooki as a biomarker for environmental monitoring. Furthermore, as the bacterial infections were associated with the capture and transport-induced stress of wild individuals, this study provides critical data on the opportunistic pathogens that may be co-introduced into recipient ecosystems through the release of this widely distributed invasive fish species. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186350 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186348 Título: Efficacy, toxicity and histopathological analysis of Astrocaryum aculeatum oil solid lipid nanoparticles on Colossoma macropomum infected by parasitic dactylogyrideans. Autoria: BRITO, B. D.; VIDEIRA, M. N.; CARVALHO, A. A. de; MARTINS, M. F.; MARINHO, V. H. S.; FERREIRA, I. M.; YOSHIOKA, E. T. O.; TAVARES-DIAS, M. Conteúdo: Foi investigada a eficácia de nanopartículas lipídicas sólidas (NLSs) de óleo fixo de Astrocaryum aculeatum em parasitos dactilogirídeos nas brânquias de Colossoma macropomum e seus efeitos na hematologia e histopatologia. O principal componente de ácido graxo do óleo fixo de A. aculeatum foi o ácido oleico (68,0%). Entre as concentrações de NLSs de óleo de A. aculeatum testadas (250-1000 mg/L), os peixes toleraram somente 250 mg/L, que foi a concentração utilizada nos cinco banhos consecutivos de 1 hora por dia. Dois grupos controles foram usados: um com ácido mirístico + Tween 80 e outro com água do tanque de cultivo. Banhos com 250 mg/L de NLSs de óleo fixo de A. aculeatum não tiveram eficácia contra Anacanthorus spathulatus, Notozothecium janauachensis e Mymarothecium boegeri. Descolamento do epitélio lamelar branquial, hiperplasia epitelial lamelar, hiperplasia lamelar com fusão e aneurisma foram danos causados pelos parasitas. O número total de linfócitos diminuiu nos peixes expostos a 250 mg/L de NLSs de óleo fixo de A. aculeatum, enquanto outros parâmetros sanguíneos não foram afetados. Embora os tratamentos com NLSs de óleo fixo de A. aculeatum não tenham sido eficazes contra dactilogirídeos como esperado, eles não foram tóxicos, pois não provocaram alterações e nas brânquias e fisiologia dos peixes. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186348 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1185966 Título: Natural diet and efficiency of baits for the capture of Macrobrachium amazonicum (Decapoda, Palaemonidae) in the lower Amazonas River, Brazil. Autoria: DUARTE, S. S.; LIMA, J. de F.; RODRIGUES, L. C.; COUCEIRO, S. R. M. Conteúdo: Macrobrachium amazonicum is a native freshwater shrimp from the northern region of Brazil, widely distributed throughout the Amazon basin, which supports an extensive regional fishery. Here, we assessed its dietary habits in the wild in a prime fishery area for this species in the lower Amazonas River (Pará state, Brazil) and evaluated the relative efficiency of three bait types (cooked rice, canned sardines, and babassu fruit meal) for both its quantitative and qualitative capture yield. Stomach contents were analyzed using occurrence frequency, the point method, and the food index. We identified four food categories: fine particulate organic matter (FPOM), coarse particulate organic matter (CPOM), particulate plant matter (PPM), and identified plant matter (INV) (leaves, root remains, and invertebrates). According to the frequency of occurrence and the point method, fine particulate organic matter (FPOM) was the most important food category (88%). In the bait attractiveness test, the average number of shrimps and total biomass captured varied significantly among treatments, with babassu flour being the most attractive. Our results indicate that M. amazonicum is omnivorous and an opportunistic generalist shrimp, and that among the three baits tested, babassu meal likely renders higher yields. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1185966 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1184331 Título: Fruit productivity of "Pera" sweet orange grafted on different rootstocks in the mesoregion of Northeast Pará (Brazil). Autoria: YOKOMIZO, G. K. I.; HONGYU, K.; GURGEL, F. de L.; SOARES FILHO, W. dos S.; GIRARDI, E. A.; PASSOS, O. S. Conteúdo: Citrus is among the most important cultivated species in the world. However, the Northern region of Brazil, despite its available cultivation, still presents incipient production and faces numerous environmental factors that require further study to mitigate the impact of genotype-by-environment interactions. To address this issue, an experiment was set up in the municipality of Capitão Poço, Pará, using a completely randomized block design to evaluate six graft/rootstock combinations with AMMI and GGE Biplot analyses. The variable assessed was total fruit weight (FW), that is the total of fruits produced by the plant, measured in kg, in the 2018, 2019, 2020, and 2021a (first half of the year) and 2021b (second half of the year) harvests. Superior rootstocks were ‘Santa Cruz’ Rangpur lime (C. x limonia Osbeck) (T1) and ‘San Diego’ citrandarin (TSK x TRENG-314) (T10). Although T1 and T10 had low stability in certain years, for ideotype aspect T1 was superior in relation to the other rootstocks and, despite the search for more promising materials, which here were the least stable, it must be accepted that there are risks, as there is no way to predict production in later years. Future research should identify which environmental factors favor fruit productivity and which generate instability in the Capitão Poço region. Wed, 01 Jan 2025 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1184331 2025-01-01T00:00:00Z