Salton Sea Fish Study Sites, CDFG

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: The California Department of Fish and Game (CDFG)

Publication_Date: 2003

Title: Salton Sea Fish Study Sites, CDFG

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage:

http://www.institute.redlands.edu/salton/downloads/shapefiles/SS_FishStudySites_CDFG.zip

Description:

Abstract:

The California Department of Fish and Game (CDFG) has committed to monitoring the status and trends of the Salton Sea fisheries. This will require a compilation of sampling results over several years.

Purpose:

Each quarter, if conditions allow, will produce about 816 net-hours of sampling. After each quarter's sampling is completed a report will be prepared, summarizing the numbers and species of fish netted, and calculating the overall and species-based catch-per-unit-effort. This report will also offer qualitative comments on the condition and breeding status of each species. After annual repetitions of seasonal sampling, enough data will be collected to allow statistical tests for significant differences in numbers, seasonality, and site use, by and among the four species of fish.

Supplemental_Information:

To allow comparison of current and future gill netting efforts by CDFG to past results, the following protocol was adapted from those previously used by researchers at the Salton Sea. A preliminary sampling period of approximately ten months was spent securing vessels, training personnel, and determining the efficacy of different equipment types and sampling methods. We began sampling using 150 foot long, five-panel gill nets. We used two net mesh configurations. Small mesh nets had 6 X 30 foot panels of 0.5, 0.75, 1, 1.25, and 1.5 inch mesh. Large mesh nets had 6 X 30 foot panels of 0.5, 1, 2, 3, and 4 inch mesh. Initially, we set nets at various distances from shore, at various depths in the water column, and various orientations to the shore, to test if these were important variables to consider. We first used nets made from multi-filament line. We found these were not strong enough to hold large corvina. Nearly every set resulted in some net damage from corvina which had torn through the net. In some cases, damage from a single set was so extreme as to render a net unusable without extensive repair. We have since switched to nets made of monofilament line, with the same configuration of mesh and panel sizes. These nets are less "tacky" to fish, but can withstand catches of large corvina without damage. We also found that the smaller mesh nets would not hold large corvina as well, and entrapped fish would flop out of the net while being hauled in. We now use large mesh nets exclusively for population sampling, and small nets are used for sampling young-of-the-year fish. Our initial set times were approximately two hours. Based on the recent experiences of others, set times longer than this might have produced a haul so large it would be problematic to process it in a timely manner, given the size of our crew. Ultimately, due to the very low numbers of fish netted during our preliminary sampling, we decided to set nets overnight to get sufficient data for robust calculations of catch per unit effort (CPUE). We tried to incorporate a variety of habitats in our choice of sites during our preliminary sampling period. These were at the Whitewater, New, and Alamo River deltas, and near-shore sets by Bombay Beach, Desert Shores, Salton City, and North Shore. From June 10, 2002 through March 13, 2003, we gill-netted on a total of 30 days, for a total of 208 net-hours. We attempted to spread our sampling efforts around the sea, to capture some of the variability among habitats. However, our sampling was not evenly distributed, either over time, or among our sites, largely due to the vagaries of weather and the conditions on the Sea. In the spring of 2003, we started quarterly sampling at fourteen stations around the sea, as the basis of a long term monitoring program. The sampling sites comprise three broad habitat types: pelagic (3 sites), near-shore (8 sites), and estuarine (3 sites). The pelagic sites are in the approximate middles of the north basin, south basin and inter-basin areas of the Sea. The near-shore sites are spaced widely apart, four each, near the west and east shores, to capture as much breadth of habitat as possible. The estuarine sites are in the body of the Sea, close enough to the mouths of the New, Alamo, and Whitewater Rivers, to be under the influence of their outflows. See Table 1. for the exact location of all sites. Sampling takes place during each of the putative seasons, as follows: spring- April and May; summer- July and August; fall- October and November; winter- January and February. We attempt to compress the total sampling period into as few days as possible, to the extent that the weather, equipment maintenance, and personnel scheduling constraints allow. Nets are typically set at one or two sites in the morning, and hauled in after approximately 24 hours. The exact number of hours set is recorded for each net, to the nearest quarter-hour. Two nets are set at all sites at the water's surface. The nets are set far enough apart to allow room for maneuvering a boat during setting and retrieval, usually 100-200 meters. The nets at near-shore and estuarine sites are set in 2.5 to 4.5 meters of water, typically 200-300 meters from the shore. Two additional nets are set at the bottom of water column at the three pelagic sites. The conditions fish experience at the bottom in deep water is different enough from the surface water, in dissolved oxygen, light, food availability and temperature, that this can be considered a discrete habitat, and thus we sample it as though it were a separate site. At the time of each set and retrieval, water depth, water temperature, conductivity, salinity, and dissolved oxygen are measured and recorded. When nets are pulled in the following day, all fish are removed and immediately stored on ice. Data are collected from these fish as soon as possible, almost always the same day they are hauled in. All fish are identified to species level and counted. For the four sport fish in the Salton Sea, (tilapia, Gulf croaker, orangemouth corvina and sargo) weights, lengths, sex, physical condition, and reproductive status are recorded. Fish above five pounds are weighed to the nearest ounce. Fish below five pounds are weighed to the nearest half ounce. Lengths of fish under 50 centimeters are recorded to the nearest millimeter. Lengths of fish over 50 centimeters are recorded to the nearest centimeter. The sex of all adult fish is determined by dissection. A sample of at least ten fish of each species is also dissected to determine physical condition and breeding status.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2003

Currentness_Reference: publication date

Status:

Progress: In work

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -116.053988

East_Bounding_Coordinate: -115.622023

North_Bounding_Coordinate: 33.519937

South_Bounding_Coordinate: 33.136310

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: tilapia

Theme_Keyword: Gulf croaker

Theme_Keyword: orangemouth corvina

Theme_Keyword: sargo

Theme_Keyword: habitat

Theme_Keyword: fisheries

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: Biologic and ecologic

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Salton Sea

Place_Keyword: California

Place_Keyword: Wister

Place_Keyword: New River

Place_Keyword: Alamo River

Place_Keyword: Whitewater River

Place_Keyword: North Shore

Place_Keyword: South Salton City

Place_Keyword: North Desert Shores

Access_Constraints: None

Use_Constraints: None

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Jack Crayon

Contact_Organization: California Department of Fish and Game (CDFG)

Browse_Graphic:

Browse_Graphic_File_Name: None

Data_Set_Credit: The California Department of Fish and Game (CDFG)

Security_Information:

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Security_Handling_Description: None

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Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The data set has been reviewed and is considered to be 99% accurate.

Logical_Consistency_Report:

Point features present. This is point data, and it has been reviewed for positional accuracy, and accuracy of the attribution. There is no topology to examine.

Completeness_Report:

The data set has no generalization, and no data was intentionally omitted.

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Point_and_Vector_Object_Information:

SDTS_Terms_Description:

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Point_and_Vector_Object_Count: 14

Spatial_Reference_Information:

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Longitude_Resolution: 0.000000

Geographic_Coordinate_Units: Decimal degrees

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Entity_and_Attribute_Information:

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Attribute:

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Attribute:

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Attribute:

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Attribute:

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Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

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Metadata_Reference_Information:

Metadata_Date: 20060906

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Redlands Institute, University of Redlands

Contact_Person: Lisa Benvenuti

Contact_Address:

Address_Type: mailing and physical address

Address: 1200 E. Colton Ave.

City: Redlands

State_or_Province: CA

Postal_Code: 92373

Country: USA

Contact_Voice_Telephone: 909-335-5268

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