33248
Master Branchiostegal data
Master data
Entity
Published / External
30416
ROUNDSCALE SPEARFISH branchiostegal morphometric data
Data Set
Completed
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.
1
OBS
VARCHAR2(4 BYTE)
No
Yes
Active
An arbitrarily assigned sequential number that serves as a key
2
TRIP
VARCHAR2(4 BYTE)
No
No
Active
The trip ID these data were collected during
3
CARC
VARCHAR2(20 BYTE)
No
No
Active
The sample number assigned by the observer to this observation. This value is only unique within a trip, and can be null.
4
ANAL_ID
VARCHAR2(1 BYTE)
No
No
Active
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
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.
5
LJFL
number
No
No
Active
The lower jaw fork length in centimeters (rounded to nearest centimeter), taken along the curve of the body.
6
LJBR
number
No
No
Active
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).
7
LJOP
number
No
No
Active
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).
8
AFH
number
No
No
Active
the height of the first anal fin in centimeters (rounded to nearest centimeter).
9
AFA
number
No
No
Active
the distance between the posterior of the anal opening and the anterior origin of the first anal fin in centimeters (rounded to nearest centimeter).
gov.noaa.nmfs.inport:33248
Larry Beerkircher
2016-07-05T15:46:38
SysAdmin InPortAdmin
2022-08-09T17:11:10
2021-05-06
Southeast Fisheries Science Center
SEFSC
75 Virginia Beach Drive
Miami
FL
33149
USA
(305)361-5761
www.sefsc.noaa.gov
8:00 a.m. - 4:30 p.m. EST
1001
Public
No
2021-05-06
1 Year
2022-05-06