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Item Identification

Title: Roundscale Spearfish Head Morphology
Status: Completed
Abstract:

The morphometric characteristics that separate white marlin Kajikia albidus from roundscale spearfish Tetrapturus georgii can be difficult for non-experts to distinguish, particularly when the animals are in the water. Using the measurements of the lower jaw tip to the longest branchiostegal ray (LJBR) and the opercle (LJOP), a discriminant function is presented that will help field observers separate the two species. The function DR-W = LJBR (3.31861) + LJOP (-2.84856) – 6.37198 classified specimens as roundscale spearfish when DR-W was > 0 and as white marlin when DR-W < 0 with a 95% correct classification rate overall. Since only the head of a specimen needs to be closely observed, the method has particular utility for tournament anglers during the hook removal process.

Notes:

Data were collected as part of the POP

Other Citation Details:

Beerkircher and Serafy 2011. Using head measurements to distinguish white marlin Kajikia albida from roundscale spearfish Tetrapturus georgii in the western North Atlantic. Bull. Mar. Sci. 87(1):147-153

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
None BILLFISH
None IDENTIFICATION
None MORPHOLOGY
None SPEARFISH
None WHITE MARLIN

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
None ATlantic
None CAribbean
None Gulf of MExico

Physical Location

Organization: Southeast Fisheries Science Center
City: Miami
State/Province: FL
Country: USA

Project Information

Project Type: Project
Is Mandated?: Yes
Mandated By: MSRA, MMPA, ESA, Atlantic HMS Regulations
Collection Type: Observer
Collection Authority: Federal
Collection Method: Biological Samples, Paper, Electronic

Support Roles

Data Steward

CC ID: 301047
Date Effective From: 2008
Date Effective To:
Contact (Person): Beerkircher, Larry
Address: 75 Virginia Beach Drive
Miami, FL 33149
Email Address: lawrence.r.beerkircher@noaa.gov
Phone: 305-361-4290
Contact Instructions:

Contact by email preferred.

Distributor

CC ID: 301050
Date Effective From: 2008
Date Effective To:
Contact (Organization): Southeast Fisheries Science Center (SEFSC)
Address: 75 Virginia Beach Drive
Miami, FL 33149
USA
Phone: (305)361-5761
URL: https://www.fisheries.noaa.gov/about/southeast-fisheries-science-center
Business Hours: 8:00 a.m. - 4:30 p.m. EST
Contact Instructions:

Contact by email preferred.

Metadata Contact

CC ID: 301048
Date Effective From: 2008
Date Effective To:
Contact (Person): Beerkircher, Larry
Address: 75 Virginia Beach Drive
Miami, FL 33149
Email Address: lawrence.r.beerkircher@noaa.gov
Phone: 305-361-4290
Contact Instructions:

Contact by email preferred.

Point of Contact

CC ID: 301049
Date Effective From: 2008
Date Effective To:
Contact (Person): Beerkircher, Larry
Address: 75 Virginia Beach Drive
Miami, FL 33149
Email Address: lawrence.r.beerkircher@noaa.gov
Phone: 305-361-4290
Contact Instructions:

Contact by email preferred.

Extents

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 210835
W° Bound: -95
E° Bound: -44
N° Bound: 46
S° Bound: 7

Access Information

Security Class: Unclassified
Data Access Procedure:

Contact POC

Data Access Constraints:

Waiver Needed

Data Quality

Representativeness:

Unknown. Likely only Representative of the white marlin and RSSP captured at these times and places by PLL vessels.

Accuracy:

Nothing is known about the degree of agreement between individual measurements in the POPOL data set and the true measurements, as the observer collecting the data is the sole source of the information and it cannot be cross checked with alternate sources.

Analytical Accuracy:

See above. The accuracy of analytical results to the “true” values cannot be determined as the true values cannot be calculated without 100 % observer coverage and multiple observers on each vessel. Neither situation has ever occurred during collection of POPOL data.

Quantitation Limits:

No limits. The species size range captured on board pelagic longline vessels can be easily measured by observers with standard hand measuring devices.

Bias:

There have been no quantitative studies to detect potential bias in POPOL.

Comparability:

There are no known comparable data sets .

Completeness Measure:

Only dead specimens could be measured; observations of live white marlin or roundscale spearfish did not include the complete detailed measurements.

Precision:

A hand centimeter measuring tool, collecting data to the nearest centimeter, can be expected to be very precise.

Analytical Precision:

No information available.

Field Precision:

No information available.

Sensitivity:

No information available.

Detection Limit:

See above, specimen needed to be dead and brought on board by the crew in order for the observer to take the complete data needed.

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
69
Data Set ROUNDSCALE SPEARFISH branchiostegal morphometric data

Catalog Details

Catalog Item ID: 26098
GUID: gov.noaa.nmfs.inport:26098
Metadata Record Created By: Lee M Weinberger
Metadata Record Created: 2015-07-24 15:23+0000
Metadata Record Last Modified By: Lee M Weinberger
Metadata Record Last Modified: 2021-05-06 22:24+0000
Metadata Record Published: 2021-05-06
Owner Org: SEFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2022-05-07