510 



Fishery Bulletin 104(4) 



area of the GBR Marine Park (designated as marine 

 national park zones [or no-take zones] ) from about 5% 

 to 33% enhances the potential for displacement of Ash- 

 ing effort between regions. If the proposed stocks have 

 different life history characteristics and, potentially, 

 different fishery productivities, less productive stocks 

 may be subjected to greater harvest levels and increased 

 risk of local depletion. Information on vital life history 

 characteristics (e.g., growth, mortality, and maturity) 

 is therefore needed to examine the potential impacts of 

 fishing and related harvest strategies for the postulated 

 stocks. Moreover, until more is known about how larvae 

 relate between stocks, prudent and precautionary man- 

 agement should recognize groups of fish that function 

 as individual units or stocks in response to harvest and 

 management (Haddon and Willis, 1995). 



Otoliths are often collected during routine sampling 

 undertaken as part of the monitoring procedures and 

 assessments of exploited fish stocks. As a result there 

 may be large archives of otoliths available for mor- 

 phological analyses in most fisheries laboratories. We 

 therefore suggest that patterns in otolith morphology 

 provide a cost and time effective starting point for di- 

 recting further research on groups of harvested coral 

 reef fishes that have lived at least parts of their life in 

 different environments. 



Acknowledgments 



Funding for this work was provided by the Australian 

 Cooperative Research Centres Program through the 

 Cooperative Research Centre for the Great Barrier Reef 

 World Heritage Area, and the Fisheries Research and 

 Development Corporation, Great Barrier Reef Marine 

 Park Authority and James Cook University. We thank 

 the numerous members of the CRC Reef Effects of Line 

 Fishing Team for the collection and processing of sam- 

 ples, especially Dong Chung Lou, Ashley Williams, and 

 Gary Russ for aging Plect?-opomiis leopardus. Simon Rob- 

 ertson provided guidance with the Fourier analysis. 



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