Table 1. School parameters and their descriptions for Fish-finder Image Segmentation Helper (FISH) outputs.
| Parameter | Description |
|---|---|
| File | Source file name |
| Time | HH:MM:SS |
| Date | YY/MM/DD |
| PicRef | File name of picture |
| Lat_dd | Latitude in decimal degrees |
| Long_dd | Longitude in decimal degrees |
| LeftLat | Latitude of left extent of school |
| LeftLon | Longitude of left extent of school |
| RightLat | Latitude of right extent of school |
| RightLon | Longitude of right extent of school |
| BotAltitude (m) | Altitude at bottom of school |
| TopDepth (m) | Depth at top of school |
| MeanAltitude (m) | Mean altitude of school |
| MeanDepth (m) | Mean depth of school |
| BotDepth (m) | Depth of sea floor |
| SchoolHeight (m) | Vertical extent of school |
| SchoolWidth (m) | Horizontal extent of school |
| Area (m2) | Area of school |
| AreaLV (m2) | Area of school less vacuoles |
| Perimeter (m) | Perimeter of school |
| MaxCalDiam (m) | Length of maximum diameter |
| MinCalDiam (m) | Length of widest point perpendicular to maximum diameter |
| MaxCalAngle (°) | Angle of maximum calibrated diameter |
| Pixel value count | Number of pixels for each pixel type* |
*Recreational fish-finders (RFF) typically classify pixels on a sequential numeric scale with no reference to actual dB values. These need to be calibrated to a scientific echo-sounder (SES).