(4/n) The data collected showed that only about half of females are mature at 75-80 cm, when they are 18 years old, highlighting the long life cycle of this species.

(3/n) Using this method, we examined past survey data and reassessed maturity based upon GSI, luckily we had been collecting information on gonad weight since 1996.

(2/n) Assessing maturity using microscopic methods, we examined if the gonadosomatic index (gonad weight / total weight) could be used to indicated maturity status. It tuns out that individuals with an GSI >1.5 are likely to be mature.

However, a new study shows that early estimates of age at maturity were too high due to biased sampling. Correcting for this results in no significant change in age at maturity over time. 2/n
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2/n Absence of neonates in the evaluated data and the scientific literature in general suggests pupping occurs in bathypelagic or benthic habitats of mid-Atlantic Ridge and/or the Irminger Sea.