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Influence of fish food and faecal pellets on short‐term oxygen uptake, ammonium flux and acid volatile sulphide accumulation in sediments impacted by fish farming and non‐impacted sediments
Author(s) -
Piedecausa María A,
AguadoGiménez Felipe,
Cerezo Valverde Jesús,
Hernández Llorente María D,
GarcíaGarcía Benjamín
Publication year - 2012
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2011.02801.x
Subject(s) - benthic zone , biology , zoology , biogeochemical cycle , feces , incubation , ammonium , microcosm , environmental chemistry , nitrogen , sediment , oxygen , fish farming , ecology , fishery , aquaculture , fish <actinopterygii> , chemistry , biochemistry , paleontology , organic chemistry
ediment cores were taken from impacted and non‐impacted areas and subjected to different incubations: (i) uninoculated, (ii) inoculated with fish feed and (iii) inoculated with gilthead seabream ( Sparus aurata ) faeces. After inoculation (or not), the cores were incubated for 8 h and the following biogeochemical fluxes were determined: sediment oxygen uptake (SOU), total ammonia nitrogen flux (TAN f ) and the production of acid volatile sulphides (AVS‐S p ). The results showed that the impacted sediments had a more pronounced benthic metabolism than non‐impacted sediments. Correlations between the variables and factorial analysis showed that oxygen consumption caused by the organic enrichment appeared as the trigger for subsequent biogeochemical alterations. The addition of faeces led to proportionally higher benthic rates of SOU, TAN f and AVS‐S p than those obtained in the feed incubations. Although the feed is relatively sterile and does not create an oxygen demand until colonized by bacteria, the faeces are already richly colonized with fish gut bacteria and could start to consume oxygen without the lag phase experienced in the incubations with feed. The TAN f values measured after the addition of feed or faeces seem to be more related to the leaching velocity of TAN than with the benthic flux, given the short incubation time.