An evaluation of a macroalgal bioassay tool for assessing the spatial extent of nutrient release from offshore fish farms

Marine Environmental Research
T García-SanzM Pérez

Abstract

In this study we develop and evaluate a macroalgal bioassay tool for monitoring the spatial extent of dissolved wastes loaded from offshore fish farms into the marine coastal ecosystem. This tool is based on the analysis of the nitrogen stable isotope ratio (delta(15)N) in tissues of several benthic primary producers (macroalgae and Posidonia oceanica epiphytes) incubated, by means of incubation devices, in the water column at increasing distances (from 0 m to 1000 m) from the fish cages. The bioassays were performed in three fish farms situated in different geographical locations (the Canary Islands, Murcia and Catalonia) and we test: the suitability of the different macroalgae species used in relation with their resistance to incubation and their sensitivity to fish farm wastes and the most appropriate incubation depth (5 m or approximately 20 m) and incubation time (2, 4 or 6 days) to detect the spatial distribution of delta(15)N around fish farms. In general terms, the results showed a significant increment of delta(15)N values toward the fish cages with respect to the reference (initial) and control values for all the species of macroalgae tested except for the red algae Asparagopsis taxiformis from Canary Islands. The mag...Continue Reading

References

May 31, 2001·Marine Pollution Bulletin·S D CostanzoM Thomas
Jan 25, 2002·Environmental Pollution·S MirtoA Mazzola
Nov 11, 2003·Marine Pollution Bulletin·Marianne HolmerCarlos M Duarte
Feb 18, 2004·Journal of Environmental Quality·Marci L ColeMaria Helena Carvalho da Silva
Jul 6, 2004·Marine Pollution Bulletin·Salvatrice Vizzini, Antonio Mazzola
Nov 24, 2004·Marine Pollution Bulletin·Gilles LepointSylvie Gobert
Mar 13, 2008·Marine Pollution Bulletin·Marta PérezJuan Manuel Ruiz
Oct 23, 2009·Marine Environmental Research·J M RuizJ L Sánchez-Lizaso

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Citations

Jun 24, 2014·Marine Pollution Bulletin·Lucia S HerbeckTim C Jennerjahn
Jun 6, 2018·Marine Pollution Bulletin·Leilani M AbayaK Lindsey Kramer
Oct 12, 2018·Marine Pollution Bulletin·R García-SeoaneJ A Fernández

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