Original papers
Age and growth of spear squid (Heterololigo bleekeri) caught in the coastal water off Miyagi Prefecture
2017 Volume 81 Issue 1 Pages 36-42
Details
2017 Volume 81 Issue 1 Pages 36-42
Age and growth of the spear squid, Heterololigo bleekeri, from 288 squids caught in the coastal water off Miyagi Prefecture from July 2014 to June 2015 were examined using a statolith microstructure.
The logistic growth equation was well fitted to examine the relationship of age and mantle length. The growth equations were shown as follows, M.L.=312(/ 1+e4.87–0.0294t) for male and M.L.=225(/1+e4.68–0.0317t) for female, where M.L. is mantle length in mm and t is age in days. A significant difference in growth equations between males and females was detected, which confirmed that males grew bigger than females (F=44.2, p<0.01). The hatching periods of H. bleekeri were estimated to be from February to September, with the main periiods being from April to June.
