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Shark and Red Snapper Bottom Longline Survey

Metadata Updated: April 1, 2024

The Southeast Fisheries Science Center Mississippi Laboratories conducts standardized fisheries independent resource surveys in the Gulf of Mexico, South Atlantic, and U.S. Caribbean to provide abundance and distribution information to support regional and international stock assessments. A shark/snapper/grouper bottom longline survey is conducted every year from July through September. The survey covers waters between 5-200 fm from Cape Hatteras, North Carolina to West Palm Beach, FL, and the U.S. northern Gulf of Mexico from southwest Florida to Brownsville, TX. During each survey approximately 300 randomly selected stations are sampled in both state and federal waters. Survey sites for bottom longline effort were selected at random within three depth strata: 9 – 55 m, 55 – 183 m, and 183 – 366 m in the Gulf of Mexico only. Most bottom longline sets are conducted parallel to depth contours unless survey conditions (i.e., current, sea state, wind) necessitated a different orientation. The number of randomly selected survey sites occupied within 60 nm contiguous sampling zones is proportionally allocated based on the amount of continental shelf area within each of the depth strata. In the Atlantic, 60% of stations were allocated between 9 - 55 m and 40% between 55 -183 m. In the Gulf of Mexico, 50% of stations were allocated between 9 - 55 m, 40% between 55 - 183 m, and 10% were allocated between 183 - 366 m (or at least 1 per sampling zone). Standardized gear utilized during the survey includes one mile of mainline and 100 15/0 circle hooks baited with Atlantic mackerel. Soak times are limited to one-hour to minimize mortality rates of all captured organisms and sampling occurs during day and night. All live sharks are tagged and released unless biological samples are needed for life history studies. Life history data pertaining to age, growth and reproduction are obtained from all captured reef fishes. All other fishes are measured and weighed prior to being released.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Date February 29, 2024
Metadata Created Date June 2, 2022
Metadata Updated Date April 1, 2024
Reference Date(s) (publication)
Frequency Of Update quarterly

Metadata Source

Harvested from NMFS SEFSC

Additional Metadata

Resource Type Dataset
Metadata Date February 29, 2024
Metadata Created Date June 2, 2022
Metadata Updated Date April 1, 2024
Reference Date(s) (publication)
Responsible Party (Custodian)
Contact Email
Guid gov.noaa.nmfs.inport:29395
Access Constraints Cite As: Southeast Fisheries Science Center, [Date of Access]: Shark and Red Snapper Bottom Longline Survey [Data Date Range],, Access Constraints: There are not restrictions or legal prerequisites for accessing these data., Use Constraints: NOAA NMFS does not approve, recommend, or endorse any proprietary product or proprietary material mentioned in this publication. No reference shall be made to NMFS, or to this publication furnished by NMFS, in any advertising or sales promotion which would indicate or imply that NMFS approves, recommends, or endorses any proprietary product or proprietary material mentioned herein or which has as its purpose any intent to cause directly or indirectly the advertised product to be used or purchased because of this NMFS publication. NMFS is not responsible for any uses of these datasets beyond those for which they were intended, and NMFS makes no claims regarding the accuracy of any data provided by agencies or individuals outside NMFS. Acknowledgement of NOAA NMFS and SEAMAP would be appreciated in products derived or publications generated from this data.
Bbox East Long -75
Bbox North Lat 36
Bbox South Lat 24
Bbox West Long -98
Coupled Resource
Frequency Of Update quarterly
Harvest Object Id b2acbf39-3323-4b7f-95cf-6f3e88c1622f
Harvest Source Id ca759a40-507d-4d0c-8f8c-64b3c5e05066
Harvest Source Title NMFS SEFSC
Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
Lineage Catch data (species, length, weight, sex) are collected on paper and are then entered into the database. Prior to 2004, all longline set locations and environmental data were recorded on paper and then manually entered into database. Since that time, these data are imported directly into the database via computer. All data are thoroughly scrutinized by watch leaders at sea and then again checked for accuracy at the end of each survey. Once considered complete and accurate, data are transferred to the custodian.
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-98.0, 24.0], [-75.0, 24.0], [-75.0, 36.0], [-98.0, 36.0], [-98.0, 24.0]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1995

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