Population structure of pond-raised Macrobrachium amazonicum with different stocking and harvesting strategies

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Water quality and plankton populations in an earthen polyculture pond

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Physical, chemical and microbiological aspects during the dry and rainy seasons in a pond covered by macrophyte used in aquaculture water supply

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Alterações no líquido sinovial do joelho de cães com osteoartrite induzida pelo modelo Pond e Nuki

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Controlling factors of benthic macroinvertebrates distribution in a small tropical pond, lateral to the Paranapanema River (São Paulo, Brazil).

The aim of the present study was to examine the benthic fauna in a marginal pond lateral to the Paranapanema River and to identify the main controlling factors of its distribution. Considering the small size of the lacustrine ecosystem, we expected that seasonal variations of the benthic community attributes are more important than spatial variations; Methods: Two samplings, one in March and another in August, were carried out at nine sites in the pond. Sediment samples were obtained through a Van Veen grab for invertebrate sorting, granulometric analysis, and for quantification of organic matter in sediment. Other abiotic factors were measured, such as water transparency, dissolved oxygen, pH, electric conductivity, temperature, and depth of sediment sampling sites. Regarding the comparative analysis at spatial scale, no significant variations in density of the benthic invertebrate community were found. Results: In relation to the studied abiotic factors, only depth presented significant differences among sampling sites; All the measured environmental parameters presented significant differences among sampling months, except depth and the physical and chemical characteristics of the sediment. The abundance of Chaoboridae and Chironomidae was the unique attribute with a significant difference in comparing the two months. A higher abundance of taxa occurred in August, especially for Oligochaeta, Nematoda, Chaoboridae, and Chironomidae; Conclusions: Because of the low structural complexity of the studied pond, we concluded that the changes in benthic macroinvertebrate community attributes were mainly due to seasonal effects.

Niche occupancy and the relative role of micro-habitat and diet in resource partitioning among pond dwelling tadpoles.

We determined microhabitat and diet niche for tadpoles from two ponds in an agricultural landscape. Additionally, we verified the intraspecific variation in resource use, and if diet and microhabitat use were correlated. Tadpoles found in the two ponds differed in microhabitat use, because in the larger pond they explored deeper places far from the margin. There were three groups with high microhabitat niche overlap. In both ponds, plant cover was the best descriptor to explain interspecific variation in microhabitat use. Tadpoles of all species ingested mainly Bacillariophyceae and Trachellomonas however the diet differed intraspecifically in the species from the two ponds. Ten items in the temporary pond and 15 items in the permanent one were ingested by all species; however, the relative abundance of each item differed. Diet similarity was not correlated to similarity in microhabitat use. In this study, diet was as important as microhabitat use to explain resource partitioning.

Diets of tadpoles from a temporary pond in southeastern Brazil (Amphibia, Anura)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Haematological alterations of Leporinus macrocephalus (Osteichtyes: Anostomidae) naturally infected by Goezia leporini (Nematoda: Anisakidae) in fish pond

Estudou-se efeito da infecção por Goezia leporini Martins & Yoshitoshi, 2003 (Nematoda: Anisakidae) sobre as características hematológicas de Leporinus macrocephalus (Osteichthyes:Anostomidae) cultivado. Palidez das brânquias, rins, fígado e coração, pontos negros nos rins e acúmulo de líquido na cavidade visceral, estômago e intestinos foram observados. O conteúdo da vesícula biliar tinha aparência pálida e translúcida. Observaram-se alta e moderada correlações positivas entre número de nematóides e peso do peixe estimadas dentro dos grupos de peixe de 0-100g e 100-200g, respectivamente. As extensões sangüíneas revelaram variações no tamanho (anisocitose) e forma (poiquilocitose) dos eritrócitos, bem como eritrócitos em divisão. Não houve alteração (P>0,05) na contagem total de eritrócitos, de leucócitos, na taxa de hemoglobina e nos percentuais de trombócitos e monócitos. A infecção provocou redução (P<0,05) no percentual de hematócrito, no volume corpuscular médio, na concentração de hemoglobina corpuscular média e no percentual de linfócitos, e aumento (P<0,05) no percentual de neutrófilos e eosinófilos no sangue circulante de peixes infectados. Este é o primeiro relato no Brasil que relaciona hematologia e infecção por nematóides em peixes cultivados.

Efficiency of aquatic macrophytes to treat Nile tilapia pond effluents

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Effects of artificial substrate and night-time aeration on the water quality in Macrobrachium amazonicum (Heller 1862) pond culture

The effects of artificial substrate and night-time aeration on the culture of Macrobrachium amazonicum were evaluated in 12 ponds stocked with 45 prawns m-2. A completely randomized design in 2 × 2 factorial scheme with three replicates was used. The combination of factors resulted in four treatments: with substrate and aeration (SA), with substrate and without aeration (SWA), without substrate and with aeration (WSA) and without substrate and aeration (WSWA). The presence of substrate in SA and SWA treatments reduced suspended particles (seston) by ~17.3% and P-orthophosphate by ~50%. The use of aerator (WSA and SA treatments) significantly (P < 0.05) increased the concentration of dissolved oxygen, suspended particles and nutrients in the pond water. These results indicate that the effect of substrate on turbidity and total suspended solids (TSS) values is opposite to the effect of the aerator. The aerators in semi-intensive grow-out M. amazonicum farming lower water quality because they increased the amount of detritus and nutrients in the pond water. On the other hand, the use of artificial substrate reduces turbidity values, chlorophyll a, TSS and P-orthophosphate concentrations. Therefore, the combination of substrate addition and night-time aeration is not interesting because they have opposite effects. © 2013 John Wiley & Sons Ltd.

Comparative morphology of pond, stream and phytotelm-dwelling tadpoles of the South American Redbelly Toads (Anura: Bufonidae: Melanophryniscus)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Broad-scale spatial patterns of canopy cover and pond morphology affect the structure of a Neotropical amphibian metacommunity

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Desempenho produtivo de Pseudoplatystoma corruscans estocados em sistemas de criação: semi-intensivo (viveiro escavado) e intensivo (tanque-rede)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

The feeding activity of Colossoma macropomum larvae (tambaqui) in fishponds with water hyacinth (Eichhornia crassipes) fertilizer

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

The use of mechanical aeration and its effects on water mass

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)