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SFCC - Scale Databasing - 2017

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SFCC - Scale Databasing - 2017

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SFCC - Scale Databasing - 2017

  1. 1. Storing, Retrieving & Using Scale Reading Data
  2. 2. The Tweed Foundation Scales Database Scales are collected by the boatmen at rod fisheries along the river from Salmon and Sea-trout that are killed Also, scales are collected by TF and RTC staff at the Paxton nets Miscellaneous scales are collected from all over the catchment Soon generated more data than could be easily manipulated, so a digital database written by James Hunt
  3. 3. The Tweed Foundation Scales Database To make this possible, had to devise a way of recording scale readings in a “digital” format: e.g. 2+.2+ open = 21.210 3.2+closed = 30.211 1.1+ open = 10.110 2.2 = 20.200 The numbers of Winters read do not change, but “plus” growth for both freshwater and marine phases is recorded as “0” if absent or “1” if present: For the marine phase, if “plus” growth is recorded (=1), then an open edge on it is recorded as “0” and a closed edge as “1”
  4. 4. The Tweed Foundation Scales Database : Data types entered Most of the cells have drop down menus of the standard data that is entered in to them so entries can be selected off these – entries are also restricted to what is on these menus so false or incomplete data cannot be entered.
  5. 5. The Tweed Foundation Scales Database : Repeat Spawners are entered in to the main database under their Sea-age, i.e. the Spawning Mark is just counted as a Winter However, when “Spawning Type” is recorded as “Yes” (i.e previously spawned) a subsidiary database opens up so that the details of this can be recorded – how many SW before first spawning, how many SMs etc.
  6. 6. The Tweed Foundation Scales Database : Two digital images, one of the juvenile & one of the adult are entered for difficult or particularly interesting scales.
  7. 7. The Tweed Foundation Scales Database : There is a menu of standard “Queries” from which outputs can be generated
  8. 8. The Tweed Foundation Scales Database : Places of origin of scales can be mapped
  9. 9. The Tweed Foundation Scales Database : Smolt ages of Summer Salmon
  10. 10. The Tweed Foundation Scales Database: Brown-trout Brown-trout scales are also put in the database, but are read like Salmon and Sea-trout, with two ages, a “burn life” and a “main channel” instead of just total age as is usually done This allows better comparison between fish for age & growth as most growth occurs during the main channel phase A 2.3 and a 1.3 trout have spent the same amount of time in main channels, so their size will be similar, even though they are year different in total age Recording the ages in the two phases separately also allows geographical growth patterns to be seen

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