Slide Menu
Search Help Show/Hide Menu

Item Identification

Title: Master Branchiostegal data
Short Name: Master data
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.

Data Attributes

Attribute Summary

Rubric Score Primary Key? Name Type Description
100
Primary Key OBS VARCHAR2(4 BYTE) An arbitrarily assigned sequential number that serves as a key
100
TRIP VARCHAR2(4 BYTE) The trip ID these data were collected during
100
CARC VARCHAR2(20 BYTE) The sample number assigned by the observer to this observation. This value is only unique within a trip, and can be null.
100
ANAL_ID VARCHAR2(1 BYTE) The species identification based on the anal opening/anal fin height ratio as categorized in Beerkircher et. al. (2008). R=roundscale spearfish, W= white marlin
100
LJFL number The lower jaw fork length in centimeters (rounded to nearest centimeter), taken along the curve of the body.
100
LJBR number The length from the tip of the jaw to the distal end of the longest branchiostegal ray taken in a straight line in centimeters (rounded to nearest centimeter).
100
LJOP number the length from the tip of the jaw to the distal end of the opercle taken in a straight line axially in c centimeters (rounded to nearest centimeter).
100
AFH number the height of the first anal fin in centimeters (rounded to nearest centimeter).
100
AFA number the distance between the posterior of the anal opening and the anterior origin of the first anal fin in centimeters (rounded to nearest centimeter).

Attribute Details

OBS

CC ID: 328735
Seq. Order: 1
Data Storage Type: VARCHAR2(4 BYTE)
Required: No
Primary Key: Yes
Status: Active
Description:

An arbitrarily assigned sequential number that serves as a key

TRIP

CC ID: 328736
Seq. Order: 2
Data Storage Type: VARCHAR2(4 BYTE)
Required: No
Primary Key: No
Status: Active
Description:

The trip ID these data were collected during

CARC

CC ID: 328737
Seq. Order: 3
Data Storage Type: VARCHAR2(20 BYTE)
Required: No
Primary Key: No
Status: Active
Description:

The sample number assigned by the observer to this observation. This value is only unique within a trip, and can be null.

ANAL_ID

CC ID: 328738
Seq. Order: 4
Data Storage Type: VARCHAR2(1 BYTE)
Required: No
Primary Key: No
Status: Active
Description:

The species identification based on the anal opening/anal fin height ratio as categorized in Beerkircher et. al. (2008). R=roundscale spearfish, W= white marlin

Derivation:

Beerkircher, L.R., D.W. Lee, and G.F. Hinteregger. 2008a. Roundscale spearfish Tetrapturus georgii: morphology, distribution, and relative abundance in the western North Atlantic. Bull. Mar. Sci. 82:155-170.

LJFL

CC ID: 328739
Seq. Order: 5
Data Storage Type: number
Required: No
Primary Key: No
Status: Active
Description:

The lower jaw fork length in centimeters (rounded to nearest centimeter), taken along the curve of the body.

LJBR

CC ID: 328740
Seq. Order: 6
Data Storage Type: number
Required: No
Primary Key: No
Status: Active
Description:

The length from the tip of the jaw to the distal end of the longest branchiostegal ray taken in a straight line in centimeters (rounded to nearest centimeter).

LJOP

CC ID: 328741
Seq. Order: 7
Data Storage Type: number
Required: No
Primary Key: No
Status: Active
Description:

the length from the tip of the jaw to the distal end of the opercle taken in a straight line axially in c centimeters (rounded to nearest centimeter).

AFH

CC ID: 328742
Seq. Order: 8
Data Storage Type: number
Required: No
Primary Key: No
Status: Active
Description:

the height of the first anal fin in centimeters (rounded to nearest centimeter).

AFA

CC ID: 328743
Seq. Order: 9
Data Storage Type: number
Required: No
Primary Key: No
Status: Active
Description:

the distance between the posterior of the anal opening and the anterior origin of the first anal fin in centimeters (rounded to nearest centimeter).

Catalog Details

Catalog Item ID: 33248
GUID: gov.noaa.nmfs.inport:33248
Metadata Record Created By: Larry Beerkircher
Metadata Record Created: 2016-07-05 15:46+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