Stylets are reduced internal structures found in the man
tle musculature, which contain concentric rings in their internal
microstructure that can be used to age octopus in a similar man
ner to otolith in fish and statoliths in squid (Bizikov, 2004; Sous
Reis and Fernandes, 2002) Leporati and Hart (2015) confirmed
daily stylet increment periodicity in O. (Cf tetricus, by injecting cap
tive octopus with calcine. Using stylet increment analysis (SIA) as
described by
Doubleday et al. (2006), a strong relationship between