Decline in the Chatham Rise orange roughy population since fishing started in the late 1970s based on model (solid line) and trawl survey results (dotted line). The horizontal line represents 20 percent of the virgin biomass (or total pre-fishing population) of the stock. This is considered the absolute minimum of safety by fisheries scientists yet the roughy are now well below this level.
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Forest and Bird, Issue 265, 1 August 1992, Unnumbered Page
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63Decline in the Chatham Rise orange roughy population since fishing started in the late 1970s based on model (solid line) and trawl survey results (dotted line). The horizontal line represents 20 percent of the virgin biomass (or total pre-fishing population) of the stock. This is considered the absolute minimum of safety by fisheries scientists yet the roughy are now well below this level. Forest and Bird, Issue 265, 1 August 1992, Unnumbered Page
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