Size frequency – equations used to estimate standard lengths and estimate
The available data on the sizes of billfish species caught by the different fisheries are presented as:??Size frequency data available: The size frequency data available in the IOTC databases is presented in (xls files compressed with WinZip): • FL_SWO.zip (as of 15-07-2013), contains the available data for swordfish • EFL_BLM.zip (as of15-07-2013), contains the available data for black marlin • EFL_BUM.zip (as of 15-07-2013), contains the available data for blue marlin • EFL_MLS_rev.zip (as of 13-09-2013), contains the available data for striped marlin • EFL_SFA.zip (as of 15-07-2013), contains the available data for Indo-Pacific sailfish Or click here if you want to download the above five files in one go FL_ALL_rev.zip The following standard lengths are used for billfish species: • Fork length: straight length from the tip of the lower jaw to the fork of the tail. Used for swordfish (SWO) • Eye to fork length: straight length from the eye orbit to the fork of the tail. Used for marl ins (BUM, BLM, MLS) and Indo-Pacific sailfish (SFA). All size data strata not recorded as standard length was converted into standard length by using the equations available for each species. Fish recorded under size class intervals other than those used for billfish species was assigned to the corresponding size class interval(s) for each species (first class is 15cm for all billfish species and class interval is 3cm). Equations: The equations used to estimate standard lengths from non-standar d measurements and to estimate weight from the available lengths can be found in Equations (as of 25-06-2013) Details about the type of SF data available can be found in SF_Reference.zip.
| Format: | Document biblioteca |
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| Language: | English |
| Published: |
2013
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| Online Access: | https://openknowledge.fao.org/handle/20.500.14283/BI971E http://www.fao.org/3/a-bi971e.pdf |
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