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Tagging - Metadata

         
Program Element

     Name of study:  Sturgeon Tagging
 
     Program manager
          Name:     David Kohlhorst
          Agency:   Department of Fish and Game
          Address:  4001 N. Wilson Way
                    Stockton, CA 95205-2424
          Phone:    (209) 948-7800
 
     Purpose/Objective:  To estimate legal-sized white sturgeon abundance 
and mortality rates and determine how these are affected by environmental 
factors and angling regulations.
 
     Geographic range of field work:  San Pablo and Suisun bays
 
     Number of sites:  2
 
     Period of record (Start year):  1974 (Tagging data before 1974 are 
not in the computer file.)
 
     Size for complete data base for program element in KB (MB):  630 KB 
(dBASE file)
     
     Number of individual files:  2
 
     Sample frequency per time unit (second, week, month): Irregular, 
1/3-5 years, but often 2 consecutive years
 
     General category of data collected (e.g., media, flow, physical, 
common chemicals, metals, pesticides, nutrients,  chlorophyll, fish, 
invertebrates, or phyto/zooplankton):
     Fish
 
     Comments about element (e.g., idiosyncracies, changes over time, 
special events, etc.):

     Increases in the minimum size limit and imposition of a maximum size 
limit starting in 1990 has reduced the number of fish available for 
tagging since only legal-sized fish are tagged.
 
Field Sampling

     Gear type or field instrument used:  trammel net
 
     Brief description of sampling procedure, including sub-sampling, 
sorting, identification of organisms  (this should include procedures for 
transport of sample from field to lab):
     Sturgeon are captured in trammel nets drifted in 4-20-ft-deep water, 
primarily in San Pablo Bay.  Legal-sized fish are tagged with a $20 reward 
disc-dangler tag placed below the anterior end of the dorsal fin.  Tagged 
fish are measured and immediately released near the capture site.  
Recaptures of tagged fish are used to estimate abundance; tags returned 
by anglers are used to estimate mortality rates.
 
     Reference to any written protocols and how to obtain a copy:  n/a
 
     Changes in gear or procedures which affected the data over time:  In 
1990 the mesh size of the trammel net was changed from 8-inch stretched 
mesh gill netting to 1/4 6-inch, 1/4 7-inch, and 1/2 8-inch webbing.
 
Laboratory analysis - Chemical

     Name and address of laboratory(s) running analysis:  n/a
 
          Current since (date):  n/a
          Historical lab (if known) or reference to other documentation:  
n/a
 
     Analytical methodology for each parameter or group of parameters:  
n/a
 
     Reference to table which lists detection limits for each parameter:  
n/a
 
          Current procedure since (date):  n/a
          Historical procedures (if known) or reference to other 
documentation:  n/a
 
     Quality assurance/control (QA/QC) protocols (if brief) or one-line 
qualifier:  n/a
 
     Reference to any written QA/QC protocols and how to obtain a copy:  
n/a
 
Laboratory analysis - Biological

     Name and address of laboratory(s) running analysis:  n/a
 
          Current since (date):  n/a
          Historical lab(if known) or reference to other documentation:  
n/a
 
     Methodology for each analysis:  n/a
 
          Current procedure since (date):  n/a
          Historical procedures (if known) or reference to other 
documentation:  n/a
 
     Reference used for identification of organisms:  n/a
 
     Location of reference collection (if one exists):  n/a
 
     Reference to table listing scientific name, common name (if any), 
and code used:
     Acipenser transmontanus, white sturgeon, species 2
     Acipenser medirostris, green sturgeon, species 3