Particulate waste outflow from fish-farming cages. How much is uneaten feed?
Ballester-Moltó, Mateo | Sanchez-Jerez, Pablo | Cerezo-Valverde, Jesús | Aguado Giménez, Felipe | Sanchez-Jerez, Pablo | Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada | Biología Marina
Particulate wastes drive benthic organic enrichment from cage fish farming. Differentiation between faeces and uneaten feed estimates at cage level are of great value to both economize the feeding process and reduce waste. This study estimates the particulate waste outflowing cages at different depths and orientations, and the wasted feed component by combining in situ measurements and modelling. Particulate matter flux (PMF) was greater vertically through the cage bottoms (60.89%), but lateral outflow was also substantial (39.11%). PMF occurs all around the cages, and the influence of the mainstream current was low. Wasted feed was greatly variable, reaching high values (about 50% of supplied feed. The self-application of feed wastage monitoring and estimates by fish farmers is recommended to improve sustainability.
Показать больше [+] Меньше [-]Part of this research was funded by the Spanish Institute of Agro-Forestry Research (INIA; Ministry of Economy and Competitiveness; project RTA2011-00088-00-00). Another part was supported by the Autonomic Government (Department of Water, Agriculture and Environment) (FEDER 1420-10) of Murcia, Spain (Regional Programme co funded by FEDER, project grant number 1420.10). The study was also partially sponsored by the student grant Sub-Programme of Researcher Formation of the Spanish Institute of Agro-Forestry Research (FPI-INIA).
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