Open Access
Table 2
Estimates of life-history parameters for frigate tuna in Sri Lankan waters utilised in the stock assessment.
| Life-history parameter | Definition | Estimate | Reference |
|---|---|---|---|
| a | Constant of the Length–Weight relationship | 0.083 | Herath et al., (2019a) |
| b | Exponent of the Length–Weight relationship | 3.430 | Herath et al., (2019a) |
| L∞ | The asymptotic average length (FL) of infinitely old fish | 64.8 cm | This study |
| K | Growth rate coefficient | 0.521 yr−1 | |
| Ø | Growth performance coefficient | 0.167 | |
| ta | The fraction of the year where yearly repeating growth curves cross length equal to zero | 0.578 year | |
| L50 | Length (FL) at 50% maturity | 32.3 cm | Herath (2019). |
| L95 | Length (FL) at 95% maturity | 35.5 cm | Herath (2019). |
| M | Pauly’s empirical formula | 0.940 yr−1 | This study |
| Then’s growth formula | 0.645 yr−1 | ||
| Gislason’s length-based formula | 0.935 yr−1 | ||
| Lorenzen’s length-based formula | 1.180 yr−1 | ||
| Mean | 0.925 yr−1 |
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