National Fisherman


AUSTRALIA - A scientific paper (Pitman, Haddy and Kloser) has been released assessing the impact of commercial fishing on the reproductive capacity (fecundity) of orange roughy.
 
Data from when exploitation began (1987–1992) is compared with current observations from the eastern Tasmanian stock.
 
Findings show that the ability to reproduce is negatively related to stock size, meaning that as the population of orange roughy declined fecundity per individual increased 41,145 (± 1,363) eggs in 1992 to 59,236 (± 1,047) eggs in 2010.
 
The fecundity per fish has increased by 73 per cent. Modelling this increase based on the 2006 stock assessment showed that the female spawning stock biomass was at 19 per cent of virgin levels, whereas the total reproductive potential was markedly higher and estimated to be at 32 per cent of virgin levels.
 
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Inside the Industry

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