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The specific growth rate of blue mussels Mytilus edulis fed Rhodomonas sp. algal cells in laboratory experiments increased with increasing food concentration to obtain a maximum value of about 9 .5% d-', irrespective of a relatively h ~ g h concentration of silt (5 mg 1.') added to the water. Ltkewise, the net growth efficiency increased with the spec~fic growth rate to a maximum value of about 75%. Measurements of the relationship between respiration and growth showed that the energy cost of growth constituted 12% of the growth. The filtration rate of a 100 mg dry wt 'standard' mussel was high and constant (about 30 m1 rnin-l) at algal concentrations below about 6000 cells ml-' when measured in both short-time (5 h) and long-time (9 to 14 d ) experiments High algal concentrations of 1.3 to 2.4 x 10?ells ml-' reduced the filtration rate by about 40":). The estimated growth, presuming maximum filtration rate, satisfactorily descnbed the actual growth a t algal concentrations <5000 cells ml-', and the concentration necessary for maximum growth was estimated at 4500 cells rill-' (corresponding to 5.6 big chlorophyll a I ' ] . The mean specific growth rate in M edubs transferred in net bags to a fjord system (Ker t~nge Nor/Kerteminde Fjol-d, Denmal-k) was about 6% d-' The results show that there is no physiological regulation of the filtration rate to nutritional needs, and that food uptake in nature (median concentration in Danish waters = 5.1 pg chlorophyll a I-') IS characterized by the full exploitation of the capacity of the bivalve filter-pump.

Growth, filtration and respiration in the mussel Mytilus edulis:no evidence for physiological regulation of the filter-pump to nutritional needs