3.2. Scope for growth
When rates of respiration and excretion were balanced against energy intake in which
carbon assimilation Žboth apparent Žapp. C-AEs, estimates of carbon assimilation not
corrected for sorting. and true Žtrue-C-AEs, estimates of carbon assimilation corrected
for sorting. ŽTable 1., the scope for growth of mussel remained positive, except under
treatments of no algae and high silt Ž0r50. ŽTable 2.. ŽApparent C-AEs is based on the
carbon content of the seston, whereas true C-AEs is based on the carbon content of the
mussels’ diet, i.e., what the mussels are actually ingestion after correcting for sorting.
Full details are in Arifin and Bendell-Young, 1997.. Scope for growth of a 0.2-gdw
mussel was significantly lower when calculated based on app. C-AE than that based on
true C-AE. For example, under a seston matrix of 150r50 and assuming non-selective
feeding Žno-sorting. the estimated SFG is only 54 J hy1. However, if one accounts for
selective feeding and calculates the SFG based on the organic content of the diet rather
than that of the seston, the SFG is 173.6 J hy1.
3.2. Scope for growthWhen rates of respiration and excretion were balanced against energy intake in whichcarbon assimilation Žboth apparent Žapp. C-AEs, estimates of carbon assimilation notcorrected for sorting. and true Žtrue-C-AEs, estimates of carbon assimilation correctedfor sorting. ŽTable 1., the scope for growth of mussel remained positive, except undertreatments of no algae and high silt Ž0r50. ŽTable 2.. ŽApparent C-AEs is based on thecarbon content of the seston, whereas true C-AEs is based on the carbon content of themussels’ diet, i.e., what the mussels are actually ingestion after correcting for sorting.Full details are in Arifin and Bendell-Young, 1997.. Scope for growth of a 0.2-gdwmussel was significantly lower when calculated based on app. C-AE than that based ontrue C-AE. For example, under a seston matrix of 150r50 and assuming non-selectivefeeding Žno-sorting. the estimated SFG is only 54 J hy1. However, if one accounts forselective feeding and calculates the SFG based on the organic content of the diet ratherthan that of the seston, the SFG is 173.6 J hy1.
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