ANOMALOUS DISTRIBUTIONS OF PELAGIC JUVENILE ROCKFISH ON THE US WEST COAST IN 2005 AND 2006

作者：Ralston Stephen^*; Stewart Ian J

来源：California Cooperative Oceanic Fisheries Investigations Reports, 2013, 54: 155-166.

A combination of midwater trawl surveys of pelagic juvenile rockfish on the U.S. West Coast provide data from 2004 to 2009, which represent the collaborative efforts of the National Marine Fisheries Service Southwest Fisheries Science Center, Northwest Fisheries Science Center, and the Pacific Whiting Conservation Cooperative to survey the waters of the California Current from the U. S.-Mexican border to the Columbia River 33 degrees-46 degrees N. We analyze six species of pelagic juvenile rockfish and evaluate the annual stability of their spatial distributions. Our results show that rockfish catches in 2005 and 2006 were shifted away from the core area of the survey, which has been sampled since 1983. In those years there was a bifurcation in their spatial distributions, with some species shifted to the north (S. entomelas, S. flavidus, and S. pinniger) and some species to the south (S. jordani and S. paucispinis). While the geographic distributions of fish in 2005 and 2006 were unusual, total abundance patterns were apparently unrelated to their spatial distributions. By 2007, the distributions of these species had recovered to pre-2005 conditions, especially for northern species. Standardized wind stress anomalies on the West Coast during the months preceding the surveys were evaluated in relation to the anomalous spatial distributions of catch. Results show that significant wind reversals occurred during February of 2005 and 2006, which is the peak of the parturition season.

• 出版日期2013-12