Description
Return interceptLength + (captureLength-interceptLength) × earlierRadius/captureRadius.
Age and growth records compare reader estimates, increments, lengths, and observation intervals. A numeric difference or back-calculation depends on the chosen origin and model rather than establishing the animal's true age.
Return interceptLength + (captureLength-interceptLength) × earlierRadius/captureRadius.
When to use this tool
Use Otolith Radius Fish Length Back Calc Term when you need one supplied age or growth-record component.
How to use the tool and how it works
- Enter captureLength, captureRadius, earlierRadius, interceptLength. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read earlierLength. Use the output convention below.
Require positive captureRadius, earlierRadius within it, and captureLength at least nonnegative interceptLength. Return interceptLength + (captureLength-interceptLength) × earlierRadius/captureRadius.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| captureLength | Capture Length | Required. Finite number. |
| captureRadius | Capture Radius | Required. Finite number; strictly above 0. |
| earlierRadius | Earlier Radius | Required. Finite number; minimum 0. |
| interceptLength | Intercept Length | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| earlierLength | Earlier Length | Required. Finite number. |
{
"input": {
"captureLength": 200,
"captureRadius": 10,
"earlierRadius": 4,
"interceptLength": 20
},
"output": {
"earlierLength": 92
}
}Limitations and assumptions
- Lengths and radii each need consistent units. This is a caller-specified linear back-calculation model, not validation of otolith growth, intercept choice, or actual earlier fish length.
- 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
Review aging validation, measurement landmarks, sampling, and the species-specific growth assumptions separately.
References
Similar or alternative tools
- Otolith Edgeage Reference Offset
Add nonnegative integer countedIncrements, edgeFraction in [0, 1], and signed suppliedReferenceOffset for ageEquivalent.
- Fish Morphometric Size Standardization Term
Multiply measurement by (referenceLength/fishLength) raised to allometricExponent and return that factor separately.