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This dataset corresponds to the size-frequency (SF) data for Swordfish (Xiphias gladius), classified by fishing fleet, year, gear, type of school, time interval (usually monthly), spatial stratum (typically CWP square grids of 5°×5°), and fork length class. The size data may originate from samples or have been raised to represent the total catch.
Size measurements have been consolidated following the processing steps described in IOTC-2020-WPDCS16-16. The conversion factors and morphometric relationships available to convert all size measurements to fork lengths are available in Table 1.
Code | Species | Source Length type | a | b | Allometric relationship | Min length | Max length | Reference |
|---|---|---|---|---|---|---|---|---|
SWO | Swordfish | CF | 1.5411e+00 | 19.60500 | LJ = a*CF+b | 32 | 180 | Poisson and Taquet (2001) |
SWO | Swordfish | PA | 2.5407e+00 | 25.69800 | LJ = a*PA+b | 18 | 105 | Poisson and Taquet (2001) |
SWO | Swordfish | LJ | 5.8641e-06 | 3.08490 | GG = a*LJ^b | 90 | 250 | Poisson and Taquet (2001) |
SWO | Swordfish | LJ | 3.8150e-06 | 3.18800 | RD = a*LJ^b | 89 | 266 | Mejuto et al. (1988) |
Mejuto, J., Iglesias, S., Rey, J.C., Alot, E., Garcia, B., 1988. Relaciones tailla-peso del pez espada (Xiphias gladius) en las areas BIL 94 y BIL 95, por estratos espacio temporales. ICCAT Collective Volume of Scientific Papers 27, 214–221.
Poisson, F., Taquet, M., 2000. French swordfish longline fishery in south west Indian Ocean: preliminary results from the PPR program. Presented at the 1st IOTC Working Party on Billfish, IOTC, Victoria, Seychelles, 30 September 2000, p. 33.
The data originate from the IOTC Contracting Parties and Cooperating Non-Contracting Parties (CPCs) as per the IOTC data requirements (Resolution 15/02). They are submitted annually, mostly using IOTC Form SF, and curated by the Secretariat for dissemination prior to IOTC Working Parties and other scientific data users.
