heavy harvesting of all herbivores is incompatible with vigorous coral
growth; see section Overfishing of this chapter, further below;
p.255-257; in ....
Pennings S.C.; 1997; Indirect Interactions on Coral Reefs; in Birkeland C. (ed.);
Life and Death of Coral Reefs; Chapman and Hall London - UK;
De Bruin G.H., Russell B.C., Bogusch A.; 1994; Species Identification Field Guide for Fishery Purposes;
Food and Agriculture Organization of the United Nations; Rome - ITA;
Vecchi P.; 1996; Fish Watching in the Maldives - A Snorkellers Guide; ITA;