New Technique for aging an octopus

Discussion in 'Physiology and Biology' started by DWhatley, Sep 24, 2013.

  1. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    Age validation in Octopus maya (Voss and Solís, 1966) by counting increments in the beak rostrum sagittal sections of known age individuals

    Guadalupe Villegas Bárcenas,Catalina Perales-Raya,Aurora Bartolomé,Eduardo Almansa,Carlos Rosas - paper via subscription
    Abstract

    The present study was carried out to validate the daily deposition and age estimation by using beak rostrum sagittal sections increments of cultivated Octopus maya (Voss and Solís, 1966). This study validates for first time the periodicity of beak increments by using animals of known age. We analyzed the rostrum sagittal sections (RSS) of upper and lower beaks in 40 juveniles of O. maya divided into four age groups (63, 87, 105 and 122 days) with 10 individuals per group. The animals were fed with a soft diet allowing obtaining age estimations not affected by the beak erosion. At the same time 50 animals were sampled every 20 days until 120 days old to obtain an age-body wet weight (BW) curve which could be compared with the age-BW curve obtained using age estimations from beaks. Co-variance analysis showed no statistical differences between both curves. The number of increments present in the beaks corresponded with the number of days from hatchling. Therefore, it was possible to validate that a growth increment corresponds to a day of life in O. maya, confirming that, up to 122 days old, the beaks counts can be used to determine the age of O. maya.
     
  2. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    Validation of growth increments in stylets, beaks and lenses as ageing tools in Octopus maya
    Almendra Rodríguez-Domínguez,Carlos Rosas.Iván Méndez-Loeza,Unai Markaida
     

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