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FishnBeer
07-03-2013, 09:37 PM
saw them out draggin a net through a hole near where we were fishing last week. they made a good 5 or 6 passes through this one spot, but it didnt look like they pulled anything big up. im guessing they were taking fish counts of sturgeon???

http://i.imgur.com/LmqUdKWl.jpg

http://i.imgur.com/HrII3gIl.jpg

http://i.imgur.com/FtqBcM3l.jpg

Marty_Gingras
07-04-2013, 12:48 PM
saw them out draggin a net through a hole near where we were fishing last week. they made a good 5 or 6 passes through this one spot, but it didnt look like they pulled anything big up. im guessing they were taking fish counts of sturgeon???


That is our R/V Scrutiny. The weeks of June 17 and July 1, it was one of 2-3 boats doing the "20-MM" Survey of (primarily) young delta smelt and longfin smelt. Information from the 20-MM Survey is used extensively in near-real time to tell the Water Projects when and roughly how many of those listed smelt are at risk of being entrained by the South Delta diversions.

The week of June 24, the Scrutiny was one of 2-3 boats doing the "Summer Townet" Survey of (mostly) young delta smelt and young striped bass. Information from the Summer Townet Survey is one of the best ways to index the abundance of young-of-the-year striped bass.

Both the 20-MM survey and the Summer Townet Survey use a small-mesh net mounted to a small sled, and they tow the net from the bottom to the surface. We index the abundance of young white sturgeon using data from an Otter Trawl towed along the bottom by the R/V Longfin during the "Bay Study".

49erbassman
07-04-2013, 01:38 PM
Welcome to the sniffer and great info there!!


Fish on!

FishnBeer
07-04-2013, 05:31 PM
Thanks, Marty. Are the results of these trawls made available to the public in any way? & how often are these studies done?

Marty_Gingras
07-04-2013, 07:18 PM
Thanks, Marty. Are the results of these trawls made available to the public in any way? & how often are these studies done?

The routine surveys we do have long histories, ranging from 1959 (Summer Townet) to 2009 (Smelt Larva Survey). We are on the water nearly every week of every month. Our laboratory --- DFW's busiest and biggest; we do everything from IDing larval fish to looking at the diet of larval fish --- operates continuously. Here is our 'home page':

http://www.dfg.ca.gov/delta/data/

We are 'bleeding edge' when it comes to making information available to the public, in that we post it to the web as soon as the data is developed (e.g., lab work done). Here are some links:

Fish Distribution + Length Freq. Map (http://www.dfg.ca.gov/delta/data/20mm/CPUE_Map3.asp)

Fish Distribution Map (http://www.dfg.ca.gov/delta/data/sls/CPUE_map.asp)

Delta Smelt Distribution Maps (http://www.dfg.ca.gov/delta/data/skt/DisplayMaps.asp)

We also publish technical articles in the Interagency Ecological Program Newsletter series. We publish heaps of information every year in 'Status and Trends' issues of the newsletter. Here is a link to the series:

Interagency Ecological Program (IEP) - Previous IEP Newsletters (http://www.water.ca.gov/iep/products/newsletterPrevious.cfm)

salmonid
07-05-2013, 06:05 PM
Very cool you guys are protecting and monitoring the resources we have!

Thanks for your work,

WhopperStopper
07-05-2013, 07:21 PM
Awesome info Marty. I have gained invaluable knowledge from studying those reports that are posted. One can learn a lot of useful information about fishing from studying up on those reports and I feel my skills have definitively been sharpened with the aide of such great information.