An article in this month's Economist magazine talks about the
importance of oysters to estuarine water quality: oysters, it says,
are picky about what they eat but not about what they filter. They
filter all suspended particles, eat a little, and excrete the rest as
pellets that sink to the bottom. Oysters live in brackish water, not
the full salinity of the open sea where iron is scarce, but there are
other filter feeders such as mussels that do live in full saltwater.
Could large-scale aquaculture of some filter-feeding organism improve
the efficiency of ocean iron fertilization by producing more sinking
fecal pellets and returning less of the carbon to the atmosphere?
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