DSpace Communidade: Programa de Pós-Graduação em Aquicultura e Recursos Aquáticos Tropicais

Produção de plântulas de ipê-rosa (Handroanthus heptaphyllus (Vell.) Mattos) em sistema de aquaponia com tambaqui (Colossoma macropomum, Cuvier, 1818.

2026-02-12T00:00:00Z

Título: Produção de plântulas de ipê-rosa (Handroanthus heptaphyllus (Vell.) Mattos) em sistema de aquaponia com tambaqui (Colossoma macropomum, Cuvier, 1818. Autor(es): LOPES, Priscila Caroline Alves Abstract: Integrated production systems, like aquaponics systems, combine agricultural and aquaculture activities to promote sustainable practices. The present study assessed the growth of pink trumpet tree ((Handroanthus heptaphyllus (Vell.) Mattos) seedlings in aquaponic systems with various planting trays and cell models, alongside, tambaqui (Colossoma macropomum, Cuvier, 1818) cultivation. Five aquaponic systems were set up with different treatments for pink trumpet tree growth, using tubes tray, hydroponic cups, commercial seedling bags, polystyrene seedbeds, and açai seed substrate in the hydroponic beds. Additionally, a control treatment with conventional seedling bags was included outside the aquaponic system. The experiment lasted for 33 days. Water quality variables, fish growth performance, and pink trumpet tree growth were evaluated at the end of the experimental period. There were significant differences (p < 0.05) in water quality among the treatments. Dissolved oxygen levels were significantly lower (p < 0.05) in the açai seed substrate treatment (7.36 ± 0.06 mg L–1) compared to the seedbed (7.62 ± 0.02 mg L–1), hydroponic cup (7.65 ± 0.03 mg L–1), and seedling bags (7.57 ± 0.03 mg L–1) treatments, but similar to the seedling tubes treatment (7.49 ± 0.04 mg L–1). The different planting bed models did not significantly (p > 0.05) impact tambaqui growth performance in pink trumpet tree. The polystyrene seedbed treatment showed a significant increase (p < 0.05) in total length, aerial part length, and root length of the pink trumpet tree compared to other treatments. Total fresh mass was significantly higher (p < 0.05) in the polystyrene seedbed treatment compared to other treatments. Leaf area significantly increased (p < 0.05) in the polystyrene seedbed treatment. Dickson indices were significantly higher (p < 0.05) in the cup tray treatment compared to other treatments. The aquaponic system with tambaqui was effective in producing pink trumpet tree seedlings.

Dinâmica espaço-temporal do microfitoplâncton em viveiro de cultivo de LITOPENAEUS VANNAMEI (boone, 1931) e sua área de influência em um estuário amazônico.

2026-01-29T00:00:00Z

Título: Dinâmica espaço-temporal do microfitoplâncton em viveiro de cultivo de LITOPENAEUS VANNAMEI (boone, 1931) e sua área de influência em um estuário amazônico. Autor(es): RIBEIRO, Denise Cristina de Souza Abstract: In order to formulate a better use of aquatic ecosystems it is necessary to evaluate the body of water, integrating and interacting simultaneously with the terrestrial environment, thus, in aquaculture activity is of extreme importance the study of the planktonic community, pointeding the phytoplankton, that representes an important role as a primary producer in aquatic ecosystems. The objective of this work was to characterize the structure of the microphytoplankton community of a marine shrimp nursery Litopenaeus vannamei and its adjacent area, during two periods, relating the abiotic and biotic factors that influence the spatiotemporal variation of microphytoplankton. For qualitative and quantitative analyzes, five points were collected delimited, using a plankton net (64μm) and was collected 200 mL of water directly from the water surface. The datas were submitted a treatment non-parametric tests (Mann-Whitney and Kruskal-Wallis, p<0,05). The indicator species were determined using the method (IndVal) and to evaluate the influence of the abiotic variables about microphytoplankton community, a RDA was performed. The microphytoplankton community contributed a total of 205 taxa (194 in the estuary and 107 in the nursery) Bacillariophyta with higher contribution mainly in the estuary. The environments were different in relation to the total density, once that the estuary presented higher density compared with nursery.

Ecologia das comunidades zooplanctônicas costeiras em frente à foz do rio Amazonas: uma abordagem sob o prisma de metacomunidades.

2014-08-30T00:00:00Z

Título: Ecologia das comunidades zooplanctônicas costeiras em frente à foz do rio Amazonas: uma abordagem sob o prisma de metacomunidades. Autor(es): SOUZA, Rosângela dos Santos Abstract: Recent advances in theoretical ecology have reorganized the understanding of the relationship between regional and environmental processes on changing the composition and structure of local communities. Zooplankton represents the link in the transfer of energy and particulate organic debris to the other trophic levels of consuming organisms, including species of economic importance such as mollusks, crustaceans and fish. Changes in the planktonic community cause profound structural changes at all trophic levels of the aquatic ecosystem. Due to its dynamic character, high reproduction rates, loss and rapid response to physicochemical changes in the environment. Interactions between Amazonian discharge, wind action and surface ocean currents control pelagic processes in the Brazilian North Coast, and their influence on physicochemical dynamics and patterns, as well as on planktonic biomass on the Amazonian Platform and adjacent oceanic area. The present study covers the area of the Amazon Continental Shelf (PCA), between the mouth of the Amazon River and the mouth of the Pará River, starting from the coastal zone of Marajó Island until near the breaking of the Continental Shelf, covering a radius of approximately 300 km from the coast. Two collection cruises were conducted in April 2013 (Cruise 1 - C1) and October 2013 (Cruise 2 - C2) with stations approximately 10 to 20 miles apart. In each season hydrological variables such as temperature, salinity and chlorophyll-a concentration were collected through a CTD. A total of 107 zooplankton taxa were identified in the 2 cruises conducted in the study area, consisting of 70.1% Holoplanktonic organisms and 29.9% Meroplanktonic organisms. The most abundant group was the copepod, with 60 taxa identified among order, family, genus and species. The density of the identified taxa were well differentiated between the months of collection, the density of meroplankton that in October was twice higher than April. The most common copepod taxa in the two periods studied were: Nauplii (unidentified), Oithona nana, Paracalanus parvus and Subeucalanus pileatus, indicating that these taxa are present throughout the Platform regardless of the time of year. The organisms with higher densities in the total species matrix were Bivalves and Clausocalanus furcatus, with 99,000 and 69,000 ind.m-3 respectively, and Sagitta spp. (48,000 ind.m-3), Gastropoda (46,000 ind.m-3) and Parvocalanus crassirostris, (44,000 ind.m-3). The area has a large seasonal variation in the biodiversity and density of its zooplankton community.

Aspectos morfológicos de mixosporídiose em peixes ornamentais Potamorrhaphis guianensis (Jardine, 1843) e Moenkhausia oligolepis (Gunther, 1864) provenientes do rio Taiassuí, Benevides/PA.

2025-10-15T00:00:00Z

Título: Aspectos morfológicos de mixosporídiose em peixes ornamentais Potamorrhaphis guianensis (Jardine, 1843) e Moenkhausia oligolepis (Gunther, 1864) provenientes do rio Taiassuí, Benevides/PA. Autor(es): CABRAL, Flávia Rodrigues Abstract: The species Potamorrhaphis guianensis (JARDINE, 1843) and Moenkhausia oligolepis (GUNTHER, 1864), known as needlefish and red-eye tetra, respectively, are used in national and international market of ornamental fish, and may be prone to different types of parasites. In view of trade and the changes caused to environment, required microparasites studies that can cause damage to hosts, commercialization and environment. The present study evaluated 100 specimens, 50 of P. guianensis and 50 of M. oligolepis, captured no Taiassuí River, Guamá river basin, located in the municipality of Benevides (01 ° 21'S, 48 ° 14'W). The animals were transported to the Carlos Azevedo Research Laboratory (LPCA-UFRA), in Belém-PA, for analysis. Fragments from various groups were taken to analyze and observe the presence of microparasites. The presence of the Myxozoa Phylum was identified in P. guianensis and M. oligolepis, processed with histological techniques and preserved material for electron microscopy (MET / MEV) and Molecular Biology (BM).