Total ammonia nitrogen leaching from feed pellets used in salmon aquaculture |
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Authors: | By M A Piedecausa F Aguado-Giménez B García-García T C Telfer |
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Institution: | Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), San Pedro del Pinatar, Murcia, Spain;;Institute of Aquaculture, University of Stirling, Scotland, UK |
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Abstract: | The total amount of ammonia nitrogen (TAN) leaching from Atlantic salmon ( Salmo salar L.) feed pellets was determined under controlled laboratory conditions. The leaching was successfully explained by means of a first order kinetic equation: , where a was the maximum TAN leached and k was the velocity of the process. Then t a was defined as the time at which a was reached, which was obtained from the equation prediction. The interaction between pellet size and immersion length significantly influenced TAN leaching: the smaller the pellet and the longer the immersion times, the higher the leaching ( a ). However, pellet size did not influence k or t a , although k tended to be higher and t a lower for larger pellets. TAN leaching from feed pellets depends on the protein content and contact surface. As the surface/volume ratio (S/V) increases with pellet size while the protein content decreases, it was hypothesized that S/V influences k whereas the protein content has a greater effect on a . |
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