Dauphin Island Sea Lab (DISL) Shark Longline Project: Coastal Gulf of Mexico (2006-2008)
Metadata:
- Identification_Information:
- Citation:
- Citation_Information:
- Originator:
- DISL: Fisheries Ecology Lab
- Publication_Date:
- Unpublished material
- Title:
- Dauphin Island Sea Lab (DISL) Shark Longline Project: Coastal Gulf of Mexico (2006-2008)
- Description:
- Abstract:
- In May 2006 the Powers Fisheries Ecology Lab in collaboration with National Marine Fisheries Service initiated a nearshore longline survey to investigate the abundance and distribution of coastal sharks in Alabama and Mississippi waters. Ten years of National Marine Fisheries Service bottom longline data indicate substantial differences in species abundance and distribution between the eastern and western Gulf of Mexico, divided roughly at Mobile Bay. These differences may carry important consequences for trophic transfer and food web dynamics between regions. As a result, the goals of this research are 1) to sample east and west of Mobile Bay to quantify any differences in distribution and abundance, 2) to use stable isotope and stomach content data to investigate potential dietary differences between regions. As researchers and resource managers consider multi-species management strategies, data like these are of paramount importance for adequate management of marine resources.
- Purpose:
- The purpose of the project is to sample east and west of Mobile Bay to quantify any differences in shark distribution and abundance and to use stable isotope and stomach content data to investigate potential dietary differences among sharks between regions.
- Time_Period_of_Content:
- Time_Period_Information:
- Range_of_Dates/Times:
- Beginning_Date:
- 200605
- Ending_Date:
- 200811
- Currentness_Reference:
- ground condition
- Status:
- Progress:
- In work
- Maintenance_and_Update_Frequency:
- As needed
- Spatial_Domain:
- Bounding_Coordinates:
- West_Bounding_Coordinate:
- -88.7167
- East_Bounding_Coordinate:
- -87.3333
- North_Bounding_Coordinate:
- 30.28698
- South_Bounding_Coordinate:
- 30.025
- Keywords:
- Theme:
- Theme_Keyword_Thesaurus:
- None
- Theme_Keyword:
- shark
- Theme_Keyword:
- stomach content
- Theme_Keyword:
- stable isotopes
- Theme_Keyword:
- abundance
- Theme_Keyword:
- distribution
- Theme_Keyword:
- nearshore
- Theme_Keyword:
- longline
- Theme_Keyword:
- eastern Gulf of Mexico
- Theme_Keyword:
- western Gulf of Mexico
- Theme_Keyword:
- food web
- Theme_Keyword:
- trophic dynamics
- Theme_Keyword:
- diet
- Theme:
- Theme_Keyword_Thesaurus:
- ISO Topic Category Code
- Theme_Keyword:
- biota
- Theme_Keyword:
- 002
- Theme_Keyword:
- environment
- Theme_Keyword:
- 007
- Theme_Keyword:
- oceans
- Theme_Keyword:
- 014
- Place:
- Place_Keyword_Thesaurus:
- None
- Place_Keyword:
- Dauphin Island Sea Lab
- Place_Keyword:
- Alabama
- Place_Keyword:
- Mobile Bay
- Place_Keyword:
- Mississippi
- Place_Keyword:
- Gulf of Mexico
- Access_Constraints:
- Permission to access these data must be given by Dr. Sean Powers or Marcus Drymon.
- Use_Constraints:
- Acknowledgment of the DISL: Fisheries Ecology Lab and the National Marine Fisheries Service would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected by users of these data. Users should be aware that comparison with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in mapping conventions, data collection, and computer processes over time. The distributor shall not be liable for improper or incorrect use of these data, based on the description of appropriate/inappropriate uses described in the metadata document. These data are not legal documents and are not to be used as such.
- Point_of_Contact:
- Contact_Information:
- Contact_Person_Primary:
- Contact_Person:
- Dr. Sean Powers or Marcus Drymon
- Contact_Organization:
- DISL: Fisheries Ecology Lab
- Contact_Address:
- Address_Type:
- mailing and physical
- Address:
- 101 Bienville Blvd.
- City:
- Dauphin Island
- State_or_Province:
- Al
- Postal_Code:
- 36528
- Country:
- USA
- Contact_Voice_Telephone:
- 251-861-2141 ext.2133
- Contact_Electronic_Mail_Address:
- spowers@disl.org
- Contact_Electronic_Mail_Address:
- mdrymon@disl.org
- Hours_of_Service:
- 8-5:00 CST
- Contact_Instructions:
- Please email Dr. Sean Powers or Marcus Drymon for further information.
- Data_Set_Credit:
- Mark Grace, Lisa Jones, Trey Driggers, John and Charlene Dindo, Tom Gouba, Clark Lollar, Hazel Wilson, Butch Sutton, Lionel LaForce, James Barbour, Kendall Falana, Jack Forrester, Keith Bates, Lee Saxon, Kristen Kelly, Matt Ajemian, Steven Scyphers, Matt Kenworthy, Glen Miller, Crystal Hightower, Brad Reynolds, Jason Herrmann, Andrea Kroetz, Cora Johnston, Eleni Petrou, Ben Toscano, James Southworth, Marla Valentine, Brian Jones, Zeb Schobernd, Christina Schobernd, Michael Hendon, Michael Felts, Carrie Horton, Angela Cicia, Mairi Miller, Erin Money
- Native_Data_Set_Environment:
- Microsoft Access
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- Data_Quality_Information:
- Logical_Consistency_Report:
- not applicable
- Completeness_Report:
- The DISL Coastal Shark Longline Project consists of several different sampling techniques. East to West block sampling took place every month from 200605 to 200811. North to South transect sampling within Mobile Bay and South of the bay's mouth took place from 200705 to 200811. Random port samples are also included in these data. This includes information from overlapping scientific studies and data collected at the Alabama Deep Sea Fishing Rodeo.
- Lineage:
- Process_Step:
- Process_Description:
- Gear Specifics: One of four research vessels was outfitted with commercial-style longline gear. Monofilament mainline (426 kg or 1000 lb test 4 mm diameter, 1 nautical mile length), was deployed off the stern through a series of blocks. High fliers or buoys were deployed at the start and end of each set during daylight hours. Five kg (11 lb) weights (start, mid-set, end set), and 3.66 m (12 ft) gangions (332 kg or 700 lb test 3 mm diameter) with hooks (#15 circle) were clipped to the mainline as it was deployed. Vessel speed ranged from 3.5 – 4 knots during the set. Bottom longline effort was 100 hooks fished for one hour (soak time). Soak time was determined from the time the buoy was deployed during the set until the first buoy was retrieved to begin the haulback. Hooks were baited with Atlantic mackerel (Scomber scombrus, 12 kg or 26 lb per set) cut to fit the circle hooks. All captures that could be safely landed were measured to the nearest mm and weighed to the nearest 0.1 kg. For captures too large to be brought on board lengths and weights were estimated. When possible the sex and state of maturity of sharks and finfish was recorded. Sharks that were not retained and in good physical condition were tagged and released. Experimental design and design change (2007): The initial coastal shark survey was initiated in May 2006. During the initial cruise, what would later turn into blocks 3 and 4 were fished (40 nautical miles). After this initial cruise, we developed a design encompassing 4 blocks, 20 nautical miles apiece. For the remaineder of 2006 (June - November), 12 stations were fished in one block each month. During a summary meeting in December 2006, it was decided to split effort between an eastern and western block each month. Beginning with the first survey in 2007, 6 stations were selected in one eastern block, and 6 stations were selected in one western block. Station selection routines remained the same; stations were selected by generating a random number list and adding that random number to the boundary of that block to get a longitude value. Another random number was then chosen and used as a distance from shore. In this way, random latitude and longitude coordinates were chosen. CTD deployment: Four CTDs were used during the course of this study, all of which are the property of NOAA Fisheries, MS Labs: SN077, SN087, a new SBE-911 on the NMFS R/V Gandy and a SBE-911 on the NMFS R/V Caretta. The two self contained units (SN-077 and SN-087) were always used on the NMFS R/V HST and the DISL R/V Wilson. Units were deployed directly following gear set out, and soaked on the surface for three minutes before the cast was made. When using self contained units, the data was uploaded to a computer after each cast. CTD processing: Data from the CTD were processed on land after completion of each cruise.
- Process_Date:
- 200811
- Process_Contact:
- Contact_Information:
- Contact_Person_Primary:
- Contact_Person:
- Dr. Sean Powers or Marcus Drymon
- Contact_Organization:
- DISL: Fisheries Ecology Lab
- Contact_Address:
- Address_Type:
- mailing and physical
- Address:
- 101 Bienville Blvd.
- City:
- Dauphin Island
- State_or_Province:
- Al
- Postal_Code:
- 36528
- Country:
- USA
- Contact_Voice_Telephone:
- 251-861-2141 ext.2133
- Contact_Electronic_Mail_Address:
- spowers@disl.org
- Contact_Electronic_Mail_Address:
- mdrymon@disl.org
- Hours_of_Service:
- 8-5:00 CST
- Contact_Instructions:
- Please email Dr. Sean Powers or Marcus Drymon for further information.
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- Entity_and_Attribute_Information:
- Overview_Description:
- Entity_and_Attribute_Overview:
- Microsoft Access tables cataloging cruise, station, set, catch, tag, CTD, stomach content and stable isotope data.
- Entity_and_Attribute_Detail_Citation:
- The CTD data from this project includes temperature, beam transmission, dissolved oxygen, depth, density, and salinity.
- Entity_and_Attribute_Detail_Citation:
- Cruise information includes a cruise ID, sampling event dates, vessel name, gear (longline, trawl, gillnet), and season.
- Entity_and_Attribute_Detail_Citation:
- Station information includes station ID (site sampled), date, longitude, latitude, depth and time.
- Entity_and_Attribute_Detail_Citation:
- Fish identification information includes common name; scientific name; precaudal length; fork length; total length (natural); standard length, stretch total length; weight; sex; maturity; tag number; if animal was injected with OTC; if liver, muscle, blood samples were taken: if stomachs were taken for gut content analysis; date stomach was analyzed; and if stomach was empty.
- Entity_and_Attribute_Detail_Citation:
- Stomach content data consists of the lowest taxonomic level the stomach content was identified to, the number of a particular item found in the gut, and weight of organisms found in stomach for each taxon.
- Entity_and_Attribute_Detail_Citation:
- Tag information includes tag number, type, recapture date, name of fisherman, location of recapture, precaudal length (mm), fork length (mm), stretch total length (mm), and weight.
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- Distribution_Information:
- Distributor:
- Contact_Information:
- Contact_Person_Primary:
- Contact_Person:
- Dr. Sean Powers or Marcus Drymon
- Contact_Organization:
- DISL: Fisheries Ecology Lab
- Contact_Address:
- Address_Type:
- mailing and physical
- Address:
- 101 Bienville Blvd.
- City:
- Dauphin Island
- State_or_Province:
- Al
- Postal_Code:
- 36528
- Country:
- USA
- Contact_Voice_Telephone:
- 251-861-2141 ext.2133
- Contact_Electronic_Mail_Address:
- spowers@disl.org
- Contact_Electronic_Mail_Address:
- mdrymon@disl.org
- Hours_of_Service:
- 8-5:00 CST
- Contact_Instructions:
- Please email Dr. Sean Powers or Marcus Drymon for further information.
- Distribution_Liability:
- The Dauphin Island Sea Lab's Fisheries Ecology Lab makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. The DISL: Fisheries Ecology Lab cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.
- Technical_Prerequisites:
- Must have software capable of reading files created in Microsoft Access.
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- Metadata_Reference_Information:
- Metadata_Date:
- 20090611
- Metadata_Contact:
- Contact_Information:
- Contact_Person_Primary:
- Contact_Person:
- Marcus Drymon
- Contact_Organization:
- DISL: Fisheries Lab
- Contact_Address:
- Address_Type:
- mailing and physical
- Address:
- 101 Bienville Blvd.
- City:
- Dauphin Island
- State_or_Province:
- Al
- Postal_Code:
- 36528
- Country:
- USA
- Contact_Voice_Telephone:
- 251-861-2141 ext. 2133
- Contact_Electronic_Mail_Address:
- mdrymon@disl.org
- Hours_of_Service:
- 8-5:00 CST
- Contact_Instructions:
- Please email Marcus Drymon for further information.
- Metadata_Standard_Name:
- FGDC Content Standard for Digital Geospatial Metadata
- Metadata_Standard_Version:
- FGDC-STD-001-1998
- Metadata_Access_Constraints:
- none
- Metadata_Use_Constraints:
- none
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