Description
Measure a nonnegative gap between supplied fish-tag detections.
Fish records distinguish morphometric length definitions, relative image scales, annulus labels, detection times and survey-effort geometry. A supplied conversion factor need not apply across species or sizes. Local labels, ratios and nominal swept areas organize observations without identifying a fish, determining age or estimating abundance.
Measure a nonnegative gap between supplied fish-tag detections.
When to use this tool
Use Fish Tag Detection Gap when you already have previousDetectionSeconds, nextDetectionSeconds and need to measure a nonnegative gap between supplied fish-tag detections.
How to use the tool and how it works
- Enter previousDetectionSeconds, nextDetectionSeconds. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read gapSeconds. Use the output convention below.
Require nextDetectionSeconds>=previousDetectionSeconds; return next-previous.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| previousDetectionSeconds | Previous Detection Seconds | Required. Finite number. |
| nextDetectionSeconds | Next Detection Seconds | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| gapSeconds | Next-previous, requiring the next timestamp not precede the previous one. | Required. Finite number. |
{
"input": {
"previousDetectionSeconds": 120,
"nextDetectionSeconds": 195
},
"output": {
"gapSeconds": 75
}
}Limitations and assumptions
- No tag, actual detection, missed event or fish behavior is assessed.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Inspect original specimens, images, reference definitions and survey logs when verifying observations. Use a complete species-appropriate measurement or population method for age, abundance or condition questions; local scales and effort terms preserve only their stated basis.
References
Similar or alternative tools
- Fish Net Soak Time Unit
Convert a supplied net-soak duration to fixed-length hours.
- Fish Tag Release Recapture Date Gap
Measure signed days from tagged-fish release to recorded recapture.