Open Access
Table 1
Derivation of LBIs as applied to frigate tuna stocks in Sri Lankan waters. Table adapted from ICES (2018).
| Indicator | Description | Reference point | Indicator ratio | Expected value | Property |
|---|---|---|---|---|---|
| Lmax5% | The mean length of the largest 5% of individuals | Linf | Lmax5%/Linf | > 0.8 | Conservation (large individuals) |
| L95% | 95% percentile of length distribution | Linf | L95%/Linf | > 0.8 | |
| Pmega | Proportion of fish larger than optimal harvest length (Lopt) + 15% | 0.3 | Pmega | >0.3 | |
| L25% | 25% percentile of the length distribution | Lmat | L25%/Lmat | > 1 | Conservation (immature individuals) |
| Lc | Length at 50% modal abundance | Lmat | Lc/Lmat | > 1 | |
| Lmean | The mean length of individuals > Lc | Lopt | Lmean/Lopt | ≈ 1 | Optimal yield |
| Lmaxy | Length class with maximum biomass in catch | Lopt | Lmaxy/Lopt | ≈ 1 | |
| Lmean | The mean length of individuals > Lc | LF=M | Lmean/LF=M | ≥ 1 | MSY |
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