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Historic trawl data and recent information infers temporal change in the occurrence of squid in the diet of orange roughy (Hoplostethus atlanticus Collett) in New Zealand

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Abstract

A review of historical trawl data for orange roughy on Chatham Rise and Challenger Plateau, New Zealand, between the years 1984 and 1996 infers a shift in this species’ diet, with a progressive decline in the percentage occurrence of squid being apparent. On Chatham Rise, this decline in the percentage occurrence of squid appears to be compensated for by increases in the percentage occurrence of fish and crustaceans in orange roughy diet, whereas on Challenger Plateau, decreases in all of squid, fish and crustaceans are apparent. New orange roughy dietary data for 2004 from Chatham Rise is consistent with earlier data series, with further declines in the percentage occurrence of squid apparent. Declines in the occurrence of squid in the diet of orange roughy could be attributed to declines in the abundance of squid as a consequence of fisheries activity.

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Acknowledgements

I would like to express my thanks to AUT Library, Dr. S. O’Shea, Dr N. Binnie, and those persons within the Ministry of Fisheries and National Institute of Water & Atmospheric Research Ltd (NIWA) that assisted with the procurement and retention of deep-sea fish by catch samples from the TAN0408 fisheries trawl survey, without whose assistance this project would not have proved possible.

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  1. Earth and Oceanic Sciences Research Institute, Auckland University of Technology, Private Bag 92-401, Auckland, 1020, New Zealand

    M. R. L. Jones

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Correspondence to M. R. L. Jones.

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Jones, M.R.L. Historic trawl data and recent information infers temporal change in the occurrence of squid in the diet of orange roughy (Hoplostethus atlanticus Collett) in New Zealand . Rev Fish Biol Fisheries 17, 493–499 (2007). https://doi.org/10.1007/s11160-006-9038-2

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