Time filter

Source Type

Marval A.,Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta | Altuve D.,Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta | Gil H.,Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta | Vizcaino G.,Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta | And 2 more authors.
Zootecnia Tropical | Year: 2011

The extraction of penaeid shrimp in estuarine stage, is an activity that generates a continuous fishing pressure on the coastal ecosystems of the intertropical zone, for that reason this study aims to evaluate the selectivity of the artisanal trawl system with the "Chica" shrimp net. The catches were made between April and November 2008, using a trawl net with 11 m of length and 2.5 cm of mesh's ligth and a small boat powered by two engines. In each sweep the bottom was trawled at depths below 5 m during 30 min. Net recovered the organism obtained were separated and weighed respectively. Three kg samples were transported refrigerated to the INIA laboratory in Cumana, Sucre State. Once there, they were taxonomically identified and a measured using a measuring board. Size structures of Litopenaeus schmitti were built separated by sex, Cetengraulis edentulus and Cathorops spixii, aplying the logistic equation to determine the range and size of selection respectively. The size range for female white shrimp fluctuated between 60 and 235 mm and the selection size L 50% was 138.62 mm, whereas in males the size distribution was shown between 80 and 190 mm with a L 50% of 131.09 mm. In the fishes, it was observed size range that oscillated between 55 and 195 mm in C. spixii and 75 and 170 mm C. edentulus, with a L 50% of 105.19 mm and 124.19 mm respectively. It was observed that the gear used in this fishery is very selective as it retains a large number of bodies, most of them without having reached a commercial size.


de Marin C.G.,Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta | Munoz D.,Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta | Marquez E.,Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta | Figueroa G.,Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta | Maza J.,Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta
Revista Cientifica de la Facultad de Ciencias Veterinarias de la Universidad del Zulia | Year: 2011

The use of fish meal for the formulation of animal feeds has been questioned by sanitary authorities of many countries, linking it as causal agent of diverse animal pathologies. Considering that fungi have the capacity to invade different substrates and produce micotoxins, this study was made in order to detect, isolate and identify filaments fungi in fish meals with the purpose to evaluate their quality and inocuousness. Two hundred and forty samples of fish meal from three fish processing plants (A, B and C) located at the Northeastern Region of Venezuela were evaluated. Percent humidity was determined by the method adopted by AOAC, while for the detection, recount and identification of fungi the methodology followed that recommended by Samson et al., using as culture media MEA agar at 2% with addition of 100 ppm of chloranphenycol and 50 ppm of streptomycin. Fungi identification was made from pure cultures, using agars Czapeck, CREA and G25N. Results showed considerable variation in the humidity content of the fish meals. The total recount of fungi varied between 3.5 x10 6 CFU/g to 4.9x10 6 CFU/g in samples from processing plants B and A, for which most fungi species were Aspergillus niger, A. terreus, A. flavus y A. versicolor. In samples from processing plant B, the isolated fungi were identified as A. penicillioides, Penicillium aurantiogriseum, P. citrinum and Alternaria alternata. It is concluded that by the type of isolated micoflora and its toxigenic potential, fish meal represents an important risk factor for the development of animal pathologies.

Loading Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta collaborators
Loading Instituto Nacional Of Investigaciones Agricolas Inia Sucre Nueva Esparta collaborators