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Concerns have been raised (e.g., Conand 1997) about the sustainability of holothurian fisheries in general and some conservation groups have raised this issue in regard to the Great Barrier Reef area.
Conand and Byrne (1993) showed a shift in species collected, from high to medium quality, due to harvesting.
Previous studies by Conand (1990; 1995) have shown that the holothurian resource is very vulnerable and that the maximum sustainable yields are probably low, e.g., only a few dozen kg per hectare per year.