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i'd like to underline that this idea is not new, i remember some years ago
(10?) the same topic was briefly discussed in the this list, the principal
objection was: because of the uncertainty about recruitment, how can we
sacrifice the younger? In italian clam fishery the debate was commercial
only. Young Callista chione are more appreciated than older ones, so for
certain period the exploitation of younger was preferred but in some areas a
probably density-dependent effect was unfavourable to the settlement(at
least on mine District). D.Del Piero

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