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STOCKTON FWO: Collaboration for Predator Collection at Liberty Island
California-Nevada Offices , March 16, 2011
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Jolene Willis and Julie Wolford of the Stockton FWO arrive on site with Nick Van Ark from DWR and Jenny Melgo from Cramer Fish Sciences to complete a beach seine.
Jolene Willis and Julie Wolford of the Stockton FWO arrive on site with Nick Van Ark from DWR and Jenny Melgo from Cramer Fish Sciences to complete a beach seine. - Photo Credit: Jared Frantzich, DWR
Jolene Willis and Julie Wolford of the Stockton FWO  complete a beach seine at Liberty Island with the help of Nick Van Ark of DWR.
Jolene Willis and Julie Wolford of the Stockton FWO complete a beach seine at Liberty Island with the help of Nick Van Ark of DWR. - Photo Credit: Jared Frantzich, DWR

By Jolene Willis, Stockton FWO

The Stockton Fish and Wildlife Office assisted the California Department of Water Resources Aquatic Ecology Section from mid-March through June collecting fish species suspected of predating on larval Delta smelt. In 2010, a pilot study was conducted by the DWR and University of California, Davis to detect the predation of Delta smelt based on the presence of Delta smelt DNA in the guts of piscivorous fishes. According to the preliminary analysis, the genetic approach utilized in the 2010 pilot study appears to be accurate and useful. As a result, the DWR set out to collect fishes throughout the North Delta including Lindsey Slough, Cache Slough, the Deep Water Ship Channel and Liberty Island to hopefully garner additional information on predation rates.

In collaboration, the STFWO provided fishes of interest to DWR biologists while conducting routine fish sampling at over 20 Liberty Island beach seine sites. The working and professional relationship developed and maintained between the DWR and STFWO remains a high priority and we hope to continue the collaboration in the future to further facilitate a better understanding of the effects of predation on native fishes.


Contact Info: Joseph Kirsch, 209-334-2968 ext. 309, joseph_kirsch@fws.gov



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