Ballester-Moltó, Mateo, Sanchez-Jerez, Pablo, Cerezo-Valverde, Jesús, Aguado Giménez, Felipe
Particulate waste outflow from fish-farming cages. How much is uneaten feed?
Marine Pollution Bulletin. 2017, 119(1): 23-30. doi:10.1016/j.marpolbul.2017.03.004
URI: http://hdl.handle.net/10045/66575
DOI: 10.1016/j.marpolbul.2017.03.004
ISSN: 0025-326X (Print)
Abstract: 
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.
Keywords:Current direction, Fish cages, Particulate waste flux, Passive waste sampler, Wasted feed
Elsevier
info:eu-repo/semantics/article