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Aquaculture Environment Interactions

    AEI prepress abstract   -  DOI: https://doi.org/10.3354/aei00378

    European lobsters utilise Atlantic salmon wastes in coastal integrated multi-trophic aquaculture systems

    A Baltadakis*, J. Casserly, L. Falconer, M. Sprague, T. C. Telfer

    *Corresponding author:

    ABSTRACT: In this study we investigated if juvenile European lobsters Homarus gammarus would eat waste from Atlantic salmon Salmo salar cages in a coastal IMTA setup and if there were any impacts on growth. Trophic interactions between salmon and lobsters was assessed using δ15N and δ13C stable isotope analysis and fatty acids profiling from fish feed as indicators of nutrient flow. Analysis revealed that lobsters directly utilised particulate waste from salmon production, as levels of indicator fatty acids from salmon feed were significantly higher in lobster tissues near the fish cages compared to the control site. Route of uptake may have been direct consumption of waste feed or faecal material or indirectly through fouling organisms. There was no indication from the stable isotope of nutrient transfer to lobsters. For stable isotope analysis, the duration of the study and/or the amount of waste consumed was not sufficient. Results show a trophic relationship between salmon and lobsters within this IMTA system, with no apparent advantage or disadvantage to growth.