Data Set Citation:
When using this data, please cite the data package:
NCEAS 12192: Fleishman: Ecosystem analysis of pelagic organism declines in the Upper San Francisco Estuary , National Center for Ecological Analysis and Synthesis , and Adib-Samii J. 2008.
POD! Fish- DFG Delta Smelt Larval Survey 2005-2006
mbauer.1007.5 (https://knb.ecoinformatics.org:443/knb/metacat/mbauer.1007.5/nceas)
General Information:
Title:POD! Fish- DFG Delta Smelt Larval Survey 2005-2006
Identifier:mbauer.1007
Abstract:
Monitor and provide information on larval delta smelt abundance and distribution in the upper San Francisco Estuary. Conduct larval fish surveys to determine the timing, distribution, and abundance of delta smelt larvae. Help estimate larval delta smelt fish losses and determine the magnitude of entrainment of larval delta smelt at Central Valley Project (CVP) and State Water Project (SWP) intakes. Name of study: Delta Smelt Larval Survey (DSLS) Program element: 096 Program manager: Kevin Fleming, kfleming@delta.dfg.ca.gov Project Lead: Michael Dege, mdege@delta.dfg.ca.gov Agency: Department of Fish and Game, Bay Delta Division Address: 4001 North Wilson Way, Stockton, CA 95205 Phone: (209) 948-7800, Fax: (209) 946-6355 Purpose/Objective: Monitor and provide information on larval delta smelt abundance and distribution in the upper San Francisco Estuary. Conduct larval fish surveys to determine the timing, distribution, and abundance of delta smelt larvae. Help estimate larval delta smelt fish losses and determine the magnitude of entrainment of larval delta smelt at CVP and SWP intakes. Data collected: temperature, electro-conductivity, water transparency, water volume, tidal stage, fish, and zooplankton. Geographic range of field work: upper San Francisco Estuary. Number of sites: between 19 and 49 stations. Period of record (start year): 2005. Size for complete database for program element in KB (MB): 5+ megabytes. Number of individual files: one file or database contains all data.
Publication Date:2008-04-01
Data Table, Image, and Other Data Details:
Metadata download: Ecological Metadata Language (EML) File
Data Table:Delta Smelt Larval Survey 1995-2006_catch per unit effort.csv ( View Metadata | Download File download)
Data Table:Delta Smelt Larval Survey 1995-2006_catch.csv ( View Metadata | Download File download)
Data Table:Delta Smelt Larval Survey 1995-2006_fish codes.csv ( View Metadata | Download File download)
Data Table:Catch ( View Metadata )
Data Table:DSLS Statons ( View Metadata )
Data Table:Fish CPUE ( View Metadata )
Data Table:Fish Codes ( View Metadata )
Data Table:Lengths ( View Metadata )
Data Table:Meter Difference ( View Metadata )
Data Table:Net Position ( View Metadata )
Data Table:Tow Info ( View Metadata )
Data Table:Water Info ( View Metadata )
Data Table:DSLS.mdb ( View Metadata | Download File download)

Involved Parties

Data Set Creators:
Organization:NCEAS 12192: Fleishman: Ecosystem analysis of pelagic organism declines in the Upper San Francisco Estuary
Organization:National Center for Ecological Analysis and Synthesis
Individual: Julio Adib-Samii
Organization:California Department of Fish and Game (DFG)
Email Address:
jadibsamii@dfg.ca.gov
Data Set Contacts:
Individual: Julio Adib-Samii
Organization:California Department of Fish and Game (DFG)
Email Address:
jadibsamii@dfg.ca.gov
Associated Parties:
Individual: Julio Adib-Samii
Individual: Erin Gleason
Metadata Providers:
Individual: Marissa Bauer

Data Set Characteristics

Geographic Region:
Geographic Description:upper San Francisco Estuary
Bounding Coordinates:
West:  122.3833  degrees
East:  122.3833  degrees
North:  38.0833  degrees
South:  38.0833  degrees
Time Period:
Begin:
2005
End:
2006

Sampling, Processing and Quality Control Methods

Step by Step Procedures
Step 1:  
Description:

Field sampling:

Sample frequency per time unit (second, week, month): starting in mid-winter (January/ February) sampling is conducted every other week and continues through early summer (June/July) or until catch efficiency decreases and/or delta smelt are not in danger of being entrained at the CVP and SWP.

Field sampling: The DSLS nets include two larval nets deployed near the bow of the boat (fore nets) and two larval nets deployed from the stern of the boat (aft nets). The fore nets are conical plankton nets 3.35 m in length with a mouth opening of 0.196 m2 and are secured to a bridle attached to aluminum poles. These nets have a 505 m Nitex monofilament mesh with canvas cod-end sections. The aft nets are made of the same material and mesh as the fore nets but also have a durable canvas mouth as well as cod-end sections are attached to the net to prevent premature wear from contact with the substrate. All nets can be deployed at once. Aft net deployment can vary depending on sharing boat resources with the 20-mm Survey program. Fish are collected in a removable 2.2 L screened (474 m stainless steel wire bolting cloth) cod-end jar. Zooplankton are collected with a Clarke-Bumpus (CB) net attached to the top of the aft net frame. The CB net consists of 160 m knotless nylon mesh and measures 78 cm long with a 12 cm mouth diameter. A General Oceananics flowmeter is mounted in the mouth of all fish nets and CB net to estimate the volume (m3) of water sampled. After each tow, the entire sample is transferred to a labeled holding jar containing 10% formalin neutralized with sodium borate. Rose Bengal dye is added to each jar to aid in separating animals from detritus.

Laboratory analysis: Sample jars are taken to the laboratory at the California Department of Fish and Game's Bay Delta Branch, Stockton. For fish samples, the complete contents are sorted and any larval fish present are identified and counted. All fish are identified to species or lowest possible taxon. The first 50 fish from each tow are randomly selected and measured (FL) to the nearest millimeter. All delta smelt are measured regardless of catch size.

Individual zooplankton samples are diluted in a beaker to a concentration that will give approximately 200 organisms per ml. The sample is thoroughly mixed and a one millimeter aliquot is extracted and placed on a Sedgewick-Rafter slide cell. Six percent of a diluted sample will be processed with a minimum of 5 cells and a maximum of 20 cells. This processing method provides a better estimate of the organisms in a sample and increases the sensitivity of detection for the relatively less abundant organisms. All zooplankton are counted and identified down to family and most are identified to genus. All lab data is recorded on data sheets corresponding to field measurements and entered into a relational database.

Relative density analysis:

The mean number of fish per volume water sampled (standardized to 1,000 m3) is calculated using the following equations:

Vt = A * K * D

Where: V = volume of water (m3) filtered through the net per tow (t)

A = mouth opening of the net (m2)

K = calibration factor for the flow meter

D = difference in flow meter counts from start to finish of tow

nt = Ft / Vt * 1,000 m3

Where: n = number of fish per 1,000 m3 per tow (t)

F = fish sampled per tow

V = volume of water filtered through the net (m3) per tow

N = nt / 3

Where: N = mean number of fish per 1,000 m3 per station.

Zooplankton processing:

Z = (CcX / V) / N

Where:

Z = the number of zooplankton per m3

C = the number of zooplankton taxon counted per cell (c)

X = the sample volume (sample dilution)

V = the volume of water filtered by the net m3

N = number of cells completed.

Changes over time:

2006 - Expansion of field stations further westward (20-mm Survey Stations) to increase coverage for delta smelt and longfin smelt. Added zooplankton sampling to the program.

Data Set Usage Rights

no restrictions
Access Control:
Auth System:knb
Order:denyFirst
Metadata download: Ecological Metadata Language (EML) File