Demographic structure, sex ratio and growth rates of southern bluefin tuna (Thunnus maccoyii) on the spawning ground.

A clear trend was evident in the percent female with fish length, decreasing steadily from 74–89% in the 150 and 155 cm length classes to only 7–27% in the 185 and 190 cm length classes.

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Results from the GLMs suggest that spawning season, month and BE index are all highly significant explanatory variables of the proportion of small SBT, as are the pair-wise interaction terms between spawning season and month and spawning season and BE index ( Table 3 ).

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