Articles de revista
http://hdl.handle.net/2117/1750
2024-03-28T20:56:09ZImproving energy efficiency in fisheries and aquaculture
http://hdl.handle.net/2117/176964
Improving energy efficiency in fisheries and aquaculture
Flos Bassols, Rosa; Reig Puig, Lourdes
In the context of a necessary change in a new energy
model development, there is a clear interest in analysing
the strong and weak points of fi sheries and aquaculture
energy expenditure to reduce it
2020-02-06T11:30:52ZFlos Bassols, RosaReig Puig, LourdesIn the context of a necessary change in a new energy
model development, there is a clear interest in analysing
the strong and weak points of fi sheries and aquaculture
energy expenditure to reduce itCan good communication change consumer perception about aquaculture?
http://hdl.handle.net/2117/130011
Can good communication change consumer perception about aquaculture?
Flos Bassols, Rosa; Reig Puig, Lourdes
According to all available data aquaculture is still one of the
fastest growing sectors of food production and contributes
significantly to the protein supply and the well being of millions of people.
2019-03-04T09:47:20ZFlos Bassols, RosaReig Puig, LourdesAccording to all available data aquaculture is still one of the
fastest growing sectors of food production and contributes
significantly to the protein supply and the well being of millions of people.Analysis of sedimentation and resuspension processes of aquaculture biosolids using an oscillating grid
http://hdl.handle.net/2117/19103
Analysis of sedimentation and resuspension processes of aquaculture biosolids using an oscillating grid
Masaló Llorà, Ingrid; Guadayol, Oscar; Peters, Francesc; Oca Baradad, Joan
Sedimentation and resuspension processes of aquaculture biosolids (non-ingested feed and faeces) are analysed using vertically oscillating grids as a source of turbulence in fluid tanks. An oscillating grid system consists of a container in which a grid is stirred vertically generating a well-known turbulent field that is function of amplitude and frequency of oscillation, distance between grid and measurement point, and mesh spacing of the grid. The grid used in this study had a mesh spacing of 1.2 cm, and was calibrated using different amplitudes (1, 1.5 and 2 cm), frequencies (from 1 to 6 Hz) and distances (2.4, 2.7 and 3 cm). After calibration, the turbulence needed to resuspend biosolids and to maintain them in the water column following different times of consolidation, and with biosolids of different origin, was analysed. It was observed that the turbulence needed to resuspend aquaculture biosolids increased with the time of consolidation. When the turbulence was decreased after a resuspension process, the next sedimentation of biosolids showed a hysteretic behaviour: turbulence needed to resuspend a fixed percent of biosolids from the tank bottom is substantially higher than that needed to maintain the same percentage suspended in the water column. Differences in resuspension behaviour of biosolids originated in different tanks were also observed.
The method provides useful information that can be compared with turbulence generated by fish swimming activity, in order to determine the culture conditions, which can promote self-cleaning conditions in a particular tank.
Menció d'Honor 2010 que atorga l'Aquacultural Engineering Society
2013-05-06T11:20:17ZMasaló Llorà, IngridGuadayol, OscarPeters, FrancescOca Baradad, JoanSedimentation and resuspension processes of aquaculture biosolids (non-ingested feed and faeces) are analysed using vertically oscillating grids as a source of turbulence in fluid tanks. An oscillating grid system consists of a container in which a grid is stirred vertically generating a well-known turbulent field that is function of amplitude and frequency of oscillation, distance between grid and measurement point, and mesh spacing of the grid. The grid used in this study had a mesh spacing of 1.2 cm, and was calibrated using different amplitudes (1, 1.5 and 2 cm), frequencies (from 1 to 6 Hz) and distances (2.4, 2.7 and 3 cm). After calibration, the turbulence needed to resuspend biosolids and to maintain them in the water column following different times of consolidation, and with biosolids of different origin, was analysed. It was observed that the turbulence needed to resuspend aquaculture biosolids increased with the time of consolidation. When the turbulence was decreased after a resuspension process, the next sedimentation of biosolids showed a hysteretic behaviour: turbulence needed to resuspend a fixed percent of biosolids from the tank bottom is substantially higher than that needed to maintain the same percentage suspended in the water column. Differences in resuspension behaviour of biosolids originated in different tanks were also observed.
The method provides useful information that can be compared with turbulence generated by fish swimming activity, in order to determine the culture conditions, which can promote self-cleaning conditions in a particular tank.Flow pattern in aquaculture circular tanks: Influence of flow rate, water depth, and water inlet & outlet features
http://hdl.handle.net/2117/17395
Flow pattern in aquaculture circular tanks: Influence of flow rate, water depth, and water inlet & outlet features
Oca Baradad, Joan; Masaló Llorà, Ingrid
2013-01-17T11:45:42ZOca Baradad, JoanMasaló Llorà, IngridDiseño de tanques en acuicultura intensiva
http://hdl.handle.net/2117/14087
Diseño de tanques en acuicultura intensiva
Oca Baradad, Joan; Masaló Llorà, Ingrid; Gutiérrez, Carmen
2011-11-27T18:28:58ZOca Baradad, JoanMasaló Llorà, IngridGutiérrez, CarmenMeasurement of sole activity by digital image analysis
http://hdl.handle.net/2117/9826
Measurement of sole activity by digital image analysis
Duarte Ortega, Sonia; Reig Puig, Lourdes; Oca Baradad, Joan
Evaluating flatfish activity can be a useful tool for studying fish behavior and welfare. The aim of this
workwas to obtain a quantitative index for measuring flatfish activity using image analysis. Accordingly,
motor activity of a sole population was recorded by digital video for three nights, bearing in mind the
nocturnal lifestyle of the species. Subsequent image analysis was done by image subtraction of
consecutive frames. The result was a ‘‘difference frame’’ showing the changes in the image area due to
fish movement. Using these data, an image processing activity index (IPAI) was determined by
measuring the percentage of area altered due to fish movement and by taking this percentage as an
indicator of fish activity. Typical sole behavioral acts (take-off and surface swimming) were recorded by
direct observation during the same intervals in order to calibrate the IPAI. A direct observation activity
index (DOAI) was determined by weighting each kind of attitude according to its average duration.
Results obtained from image analysis (IPAI) were compared with results obtained by direct observation
(DOAI). A linear relationship between the two indexes was found with a correlation coefficient of
r2 = 0.80 for 92% of coverage area tank and r2 = 0.90 for 210% of coverage area tank. Thus, this digital
video-based index can be a highly reliable and accuratemethod for objectivelymeasuring activity levels
in sole with a low consumption of labor and time. Nevertheless, the application to farm conditions would
need further research and an accurate calibration for other species.
2010-10-19T14:49:15ZDuarte Ortega, SoniaReig Puig, LourdesOca Baradad, JoanEvaluating flatfish activity can be a useful tool for studying fish behavior and welfare. The aim of this
workwas to obtain a quantitative index for measuring flatfish activity using image analysis. Accordingly,
motor activity of a sole population was recorded by digital video for three nights, bearing in mind the
nocturnal lifestyle of the species. Subsequent image analysis was done by image subtraction of
consecutive frames. The result was a ‘‘difference frame’’ showing the changes in the image area due to
fish movement. Using these data, an image processing activity index (IPAI) was determined by
measuring the percentage of area altered due to fish movement and by taking this percentage as an
indicator of fish activity. Typical sole behavioral acts (take-off and surface swimming) were recorded by
direct observation during the same intervals in order to calibrate the IPAI. A direct observation activity
index (DOAI) was determined by weighting each kind of attitude according to its average duration.
Results obtained from image analysis (IPAI) were compared with results obtained by direct observation
(DOAI). A linear relationship between the two indexes was found with a correlation coefficient of
r2 = 0.80 for 92% of coverage area tank and r2 = 0.90 for 210% of coverage area tank. Thus, this digital
video-based index can be a highly reliable and accuratemethod for objectivelymeasuring activity levels
in sole with a low consumption of labor and time. Nevertheless, the application to farm conditions would
need further research and an accurate calibration for other species.Stocking density and sex influence individual growth of Senegalese sole (Solea senegalensis)
http://hdl.handle.net/2117/9090
Stocking density and sex influence individual growth of Senegalese sole (Solea senegalensis)
Sánchez Fernández, Pablo; Ambrosio Jiménez, Pedro Pablo; Flos Bassols, Rosa
2010-09-25T19:44:56ZSánchez Fernández, PabloAmbrosio Jiménez, Pedro PabloFlos Bassols, RosaStudy of fish swimming activity using Acoustical Doppler Velocimetry (ADV) techniques
http://hdl.handle.net/2117/1451
Study of fish swimming activity using Acoustical Doppler Velocimetry (ADV) techniques
Masaló Llorà, Ingrid; Reig Puig, Lourdes; Oca Baradad, Joan
2007-12-28T09:52:39ZMasaló Llorà, IngridReig Puig, LourdesOca Baradad, JoanStocking density and its influence on shape of Senegalese sole adults
http://hdl.handle.net/2117/1428
Stocking density and its influence on shape of Senegalese sole adults
Ambrosio Jiménez, Pedro Pablo; Costa, Corrado; Sánchez Fernández, Pablo; Flos Bassols, Rosa
2007-12-17T15:56:07ZAmbrosio Jiménez, Pedro PabloCosta, CorradoSánchez Fernández, PabloFlos Bassols, RosaComparative analysis of flow patterns in aquaculture rectangular tanks with different water inlet characteristics
http://hdl.handle.net/2117/731
Comparative analysis of flow patterns in aquaculture rectangular tanks with different water inlet characteristics
Oca Baradad, Joan; Masaló Llorà, Ingrid; Reig Puig, Lourdes
2007-03-28T08:28:38ZOca Baradad, JoanMasaló Llorà, IngridReig Puig, Lourdes