Variation in the condition factors of California pelagic fishes and associated environmental factors

Time series of condition factors for mackerel, Scomber japonicus, jack mackerel, Truchurus symmetricus, and northern anchovy, Engraulis mordax, stocks in the Southern California region were compared with time series of oceanographic indices to develop hypotheses concerning physical environmental forcing of the population dynamics and energetics of small pelagic fishes

RICHARD H. PARRISH; DONNA L. MALLICOATE

2007

Scholarcy highlights

  • Time series of condition factors for mackerel, Scomber japonicus, jack mackerel, Truchurus symmetricus, and northern anchovy, Engraulis mordax, stocks in the Southern California region were compared with time series of oceanographic indices to develop hypotheses concerning physical environmental forcing of the population dynamics and energetics of small pelagic fishes
  • To a lesser extent jack mackerel, condition factors were correlated with proxy indices of alongshore advection, offshore advection, ambient temperature, and ambient salinity
  • The condition factor of anchovy was much less correlated with environmental variables
  • The first-order variation in condition factors of mackerel and jack mackerel suggests that they are responding to very large-scale perturbations of the California Current system which are at least partially described by variations in sea level
  • The second-order variation is more regional in nature and unexpectedly it appears to be associated with upwelling in the Baja California region

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