Description
Return total-minus-fork, total-minus-standard, and fork-minus-standard differences.
Fish morphometrics relate lengths, masses, ratios, and geometric components under stated measurement conventions. Standard, fork, and total lengths have distinct anatomical bases and should not be treated as interchangeable labels.
Return total-minus-fork, total-minus-standard, and fork-minus-standard differences.
When to use this tool
Use Fish Caudal Notch Length Difference Term when you need one explicit morphometric component using compatible supplied measurements.
How to use the tool and how it works
- Enter totalLength, forkLength, standardLength. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read notchDifference, caudalExtension, forkStandardDifference. Use the output convention below.
Require totalLength at least forkLength at least nonnegative standardLength. Return total-minus-fork, total-minus-standard, and fork-minus-standard differences.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| totalLength | Total Length | Required. Finite number. |
| forkLength | Fork Length | Required. Finite number. |
| standardLength | Standard Length | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| notchDifference | Notch Difference | Required. Finite number. |
| caudalExtension | Caudal Extension | Required. Finite number. |
| forkStandardDifference | Fork Standard Difference | Required. Finite number. |
{
"input": {
"totalLength": 120,
"forkLength": 110,
"standardLength": 95
},
"output": {
"notchDifference": 10,
"caudalExtension": 25,
"forkStandardDifference": 15
}
}Limitations and assumptions
- Use one unit and compatible anatomical measurement definitions; the differences do not infer missing measurements or convert among species-specific length standards.
- 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
Check measurement landmarks, species-specific models, and uncertainty before interpreting biological condition or comparing samples.
References
Similar or alternative tools
- Fish Standard Total Length Gap
Return their difference and total/standard when standard is positive, otherwise ratio zero and defined false.
- Fish Length Reference Offset
Add signed suppliedCorrection to nonnegative observedLength, require a nonnegative corrected result, and subtract nonnegative referenceLength for offset.