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Year Class Strength - Metadata


 Program Element

     Name of study:  Monitoring of Sturgeon Year Class Strength
 
     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 determine methods that can be used to collect 
a representative sample of juvenile sturgeon to develop a reliable index 
of year class abundance and to determine environmental factors affecting 
sturgeon year class strength.
 
     Geographic range of field work:  San Pablo Bay to Rio Vista and 
Bradford Island
 
     Number of sites:  approximately 35
 
     Period of record (Start year):  1989
 
     Size for complete data base for program element in KB (MB): 0
     Number of individual files: 0 (data mostly on field data sheets)
 
     Sample frequency per time unit (second, week, month): 1 week/month
 
     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.):

     Sampling methods have changed as different gears have been tried.
 
Field Sampling

     Gear type or field instrument used:  baited set line, drift and set 
gill nets, otter trawl
 
     Brief description of sampling procedure, including sub-sampling, 
sorting, identification of organisms  (this should include procedures for 
transport of sample from field to lab):
     Juvenile sturgeon have been collected with baited set lines fished 
overnight, small mesh gill nets drifted in both deep and shallow water for
1 hour, small mesh gill nets set overnight, and otter trawls towed on the
bottom for 5 minutes.  Juvenile sturgeon have also been collected from the
gill nets used to capture striped bass for tagging in the western Delta.  
A pectoral fin ray is removed from most juvenile sturgeon for age 
determination.  Lengths of all sturgeon are recorded and unaged fish are 
assigned an age and year class based on an age-length key.
 
     Reference to any written protocols and how to obtain a copy:  n/a
 
     Changes in gear or procedures which affected the data over time:  
see sampling procedures above
 
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:  
     Department of Fish and Game,
     4001 N. Wilson Way, Stockton, CA 95205-2424
 
          Current since (date):  1989
          Historical lab(if known) or reference to other documentation:  
n/a
 
     Methodology for each analysis:  Age of juvenile sturgeon is estimated
by counting growth rings visible on cross-sections of the first pectoral 
fin ray.  Unaged or unageable fish are assigned an age based on an 
age-length key.
 
          Current procedure since (date):  1989
          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