Roundscale Spearfish Head Morphology
Southeast Fisheries Science Center
Project
(PRJ)
| ID: 26098
| Published / External
Created: 2015-07-24
|
Last Modified: 2022-08-09
Project (PRJ) | ID: 21322
ID: 26098
Project (PRJ)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | Roundscale Spearfish Head Morphology |
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Short Name | |
* Status | Completed |
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* » 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. |
* Purpose | |
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 |
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Keywords
Theme Keywords
Thesaurus | Keyword |
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None | BILLFISH |
None | IDENTIFICATION |
None | MORPHOLOGY |
None | SPEARFISH |
None | WHITE MARLIN |
Temporal Keywords
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* Spatial Keywords
Thesaurus | Keyword |
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None | ATlantic |
None | CAribbean |
None | Gulf of MExico |
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Physical Location
• » Organization | Southeast Fisheries Science Center |
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• » City | Miami |
• » State/Province | FL |
• Country | USA |
• » Location Description |
Project Information
Project Type | Project |
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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
* » Support Role | Data Steward |
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* » Date Effective From | 2008 |
Date Effective To | |
Person | Beerkircher, Larry |
Address |
75 Virginia Beach Drive Miami, FL 33149 |
Email Address | lawrence.r.beerkircher@noaa.gov |
Phone | 305-361-4290 |
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URL | |
Business Hours | |
Contact Instructions |
Contact by email preferred. |
* » Support Role | Distributor |
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* » Date Effective From | 2008 |
Date Effective To | |
Organization | Southeast Fisheries Science Center (SEFSC) |
Address |
75 Virginia Beach Drive Miami, FL 33149 USA |
Email Address | |
Phone | (305)361-5761 |
Fax | |
Mobile | |
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. |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2008 |
Date Effective To | |
Person | Beerkircher, Larry |
Address |
75 Virginia Beach Drive Miami, FL 33149 |
Email Address | lawrence.r.beerkircher@noaa.gov |
Phone | 305-361-4290 |
Fax | |
Mobile | |
URL | |
Business Hours | |
Contact Instructions |
Contact by email preferred. |
* » Support Role | Point of Contact |
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* » Date Effective From | 2008 |
Date Effective To | |
Person | Beerkircher, Larry |
Address |
75 Virginia Beach Drive Miami, FL 33149 |
Email Address | lawrence.r.beerkircher@noaa.gov |
Phone | 305-361-4290 |
Fax | |
Mobile | |
URL | |
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Contact Instructions |
Contact by email preferred. |
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Extents
Currentness Reference |
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Extent Group 1
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Extent Group 1 / Geographic Area 1
* » W° Bound | -95 |
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* » E° Bound | -44 |
* » N° Bound | 46 |
* » S° Bound | 7 |
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* » Security Class | Unclassified |
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» Data Access Procedure |
Contact POC |
• » Data Access Constraints |
Waiver Needed |
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Technical Environment
Description |
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Data Quality
Representativeness |
Unknown. Likely only Representative of the white marlin and RSSP captured at these times and places by PLL vessels. |
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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. |
Horizontal Positional Accuracy | |
Vertical Positional Accuracy | |
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. |
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» Quality Control Procedures Employed |
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Child Items
Rubric scores updated every 15m
Score | Type | Title |
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71 | Data Set (DS) | ROUNDSCALE SPEARFISH branchiostegal morphometric data |
Related Items
Item Type | Relationship Type | Title |
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Catalog Details
Catalog Item ID | 26098 |
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Metadata Record Created By | Lee M Weinberger |
Metadata Record Created | 2015-07-24 15:23+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2022-08-09 17:11+0000 |
Metadata Record Published | 2021-05-06 |
Owner Org | SEFSC |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2021-05-06 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2022-05-06 |
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