TY - JOUR
T1 - Eye lens structure of the octopus enteroctopus megalocyathus
T2 - Evidence of growth
AU - Baqueiro Cárdenas, Erick R.
AU - Medrano Correa, Sonia
AU - Contreras Guzman, Ramiro
AU - Barahona, Nancy
AU - Briceño, Felipe
AU - Villegas, Maria José
AU - Paredes, Rodolfo
PY - 2011/8
Y1 - 2011/8
N2 - The need for age determination for the proper management of octopus fisheries has directed research attention to the few hard structures in the octopod's soft body, beak, statoliths, and the vestigial shell. So far, none of these structures have proved reliable or practical for the purpose. Eye weight, pigment, and nitrogen content have been used successfully in age determination of vertebrates. Given the structural similarity of lenses between octopus and vertebrate, we explore the possibility of using octopus eye lens weight, diameter, and structural marks as age indicators. The lenses of 228 octopi were obtained from the commercial catch from Ancud and Quelln, in Chiloe, Chile. They were measured, weighed, and prepared for histological analysis of the concentric lines structure. The prehatching nucleus was identified, and the total number of lines counted. The lines start to form in the prehatching larvae. Lens diameter and weight showed a much smaller variation than body length or weight, with an apparent correspondence of size or weight classes of body measurements to a lens diameter or weight.
AB - The need for age determination for the proper management of octopus fisheries has directed research attention to the few hard structures in the octopod's soft body, beak, statoliths, and the vestigial shell. So far, none of these structures have proved reliable or practical for the purpose. Eye weight, pigment, and nitrogen content have been used successfully in age determination of vertebrates. Given the structural similarity of lenses between octopus and vertebrate, we explore the possibility of using octopus eye lens weight, diameter, and structural marks as age indicators. The lenses of 228 octopi were obtained from the commercial catch from Ancud and Quelln, in Chiloe, Chile. They were measured, weighed, and prepared for histological analysis of the concentric lines structure. The prehatching nucleus was identified, and the total number of lines counted. The lines start to form in the prehatching larvae. Lens diameter and weight showed a much smaller variation than body length or weight, with an apparent correspondence of size or weight classes of body measurements to a lens diameter or weight.
KW - Enteroctopus
KW - age
KW - eye
KW - histology
KW - lens
KW - octopod
KW - octopus
UR - http://www.scopus.com/inward/record.url?scp=80052327816&partnerID=8YFLogxK
U2 - 10.2983/035.030.0201
DO - 10.2983/035.030.0201
M3 - Article
AN - SCOPUS:80052327816
SN - 0730-8000
VL - 30
SP - 199
EP - 204
JO - Journal of Shellfish Research
JF - Journal of Shellfish Research
IS - 2
ER -