Environmental predictors of hoki year-class strengths : an update / R.I.C.C. Francis, M.G. Hadfield, J.M. Bradford-Grieve, J.A. Renwick, P.J.H. Sutton.

By: Francis, R. I. C. C.
Contributor(s): Hadfield, M. G. (NIWA. Wellington) | Bradford-Grieve, J. M. (NIWA. Wellington) | Renwick, J. A. (NIWA. Wellington) | Sutton, P. J. H. (NIWA. Wellington) | NIWA Wellington (N.Z.).
Material type: materialTypeLabelBookSeries: New Zealand fisheries assessment report: 2005/58Publisher: Wellington, N.Z. : Ministry of Fisheries, 2005Description: 22 pages : illustrations, figures, tables ; 30 cm.ISSN: 1175-1584.Subject(s): HOKI | MACRURONUS NOVAEZELANDIAE | STOCK ASSESSMENT | ENVIRONMENTAL CONDITIONS | PREDICTION | SOUTHERN OSCILLATION | SEA SURFACE TEMPERATURES | SYNOPTIC CLIMATOLOGY | WIND SPEED | NITRATES | CHATHAM RISE | COOK STRAIT | SUBANTARCTIC REGIONS | NEW ZEALANDOnline resources: Click here to access online In: New Zealand fisheries assessment reportSummary: The relationship between hoki year-class strengths (YCSs) and potential environmental predictors was investigated. The predictors considered were the southern oscillation index, synoptic weather patterns, sea-surface temperatures, wind speeds, and two characteristics of the ocean off the west coast of the South Island: the depth of the mixed layer and nitrate concentration. Four types of predictands were investigated: YCSs for the western, eastern, and combined stocks and the annual proportion of young fish that migrate from the Chatham Rise to the sub-Antarctic. This last proportion is believed to control how much of the total hoki recruitment ends up spawning in each of the two major spawning grounds. Prediction performance was measured by percent variance explained (PVE) and estimated using cross-validation.
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JOURNAL JOURNAL WELLINGTON
JOURNALS
NO. 2005/58 1 Available J019772

NIWA project HOK200401

The relationship between hoki year-class strengths (YCSs) and potential environmental predictors was investigated. The predictors considered were the southern oscillation index, synoptic weather patterns, sea-surface temperatures, wind speeds, and two characteristics of the ocean off the west coast of the South Island: the depth of the mixed layer and nitrate concentration. Four types of predictands were investigated: YCSs for the western, eastern, and combined stocks and the annual proportion of young fish that migrate from the Chatham Rise to the sub-Antarctic. This last proportion is believed to control how much of the total hoki recruitment ends up spawning in each of the two major spawning grounds. Prediction performance was measured by percent variance explained (PVE) and estimated using cross-validation.

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