论文信息 - Chemical and biological remediation of the benthos near Atlantic salmon farms

Chemical and biological remediation of the benthos near Atlantic salmon farms

Abstract Salmon farms in British Columbia now typically produce over 2000 mt of fish during each 18- to 24-month production cycle. An 18-month study of Stolt Sea Farms' Arrow Pass farm was undertaken in 1996 to examine the spatial and temporal extents of chemical and biological benthic effects. Microbial metabolism of farm biodeposits in nearfield sediments resulted in increased sulfide concentrations and decreased redox potential. These physicochemical changes modified the macrobenthic community. Species sensitive to enrichment were quickly extinguished from the immediate vicinity of the farm and were replaced by the organic carbon tolerant opportunistic annelids Capitella capitata and Ophryotrocha cf. vivipara. These effects extended to at least 50 m from the net-pen's perimeter on the downcurrent transect. Chemical remediation, defined as a return to reference levels of organic carbon, a reduction in free sediment sulfides to

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