Table 1.
Estimated total annual landings (tonnes) of tuna at Benoa, Bali, by species since 1993.
Table 2.
Number of SBT samples by fork length (FL), dressed weight (DW), sex, otoliths and age spawning season.
Figure 1.
Length (left) and age (right) distribution of the SBT spawning stock by spawning season.
The dark grey bar shows the median length class. For comparison, the length distribution of SBT thought to be caught south of the spawning ground (Company A) is shown for the 2004 (n = 121), 2005 (n = 685), 2006 (n = 311) and 2007 (n = 452) seasons (solid grey line). The 3-year running mean of the age distribution is shown (solid black line) and the two possible pulses of recruitment to the fishery (dashed grey line).
Figure 2.
Proportion of SBT caught by size (A) and age (B) classes by spawning season.
Mean fork length (FL) ± 2SE (upper graph) and mean age of all and SBT ≥20 years (yrs) (lower graph) by spawning seasons are shown in red. Data from Company A operating south of the spawning ground were excluded.
Figure 3.
Mean bigeye index (x) and proportion <165 cm FL (•) by spawning season.
Figure 4.
Proportion of SBT <165 cm by spawning season for bigeye index (A) and month-group (B).
BEI0 is shallow, BEI4 is deep. BEI = bigeye index.
Figure 5.
Mean fork length of SBT by spawning season.
Data are shown for observed (Δ) and estimated mean length when BE index (•) and month (x) is accounted for in the length distribution of fish caught.
Figure 6.
Expected proportion of small SBT each month and level of the bigeye index.
Proportions calculated from the best-fitting generalized linear model. BEI0 is shallow, BEI4 is deep. BEI = bigeye index.
Table 3.
Analysis of deviance table from fitting a generalized linear model to the proportion of small (≤165 cm) SBT on the spawning ground.
Figure 7.
Percent female by 5-cm length class for SBT in the Indonesian catch in 2009–2012.
Data point excluded if n<10.
Figure 8.
Mean length-at-age ± 2SE for male and female SBT caught on the spawning ground.
Note that fish over age 25 were pooled into age group 26+.
Figure 9.
von Bertalanffy (VB) growth curves fitted to the age and length data by sex.
Figure 10.
Mean length-at-age ± 2SE for fish caught on and off the spawning ground by sex.
SG = spawning ground.