2023 Volume 71 Issue 1 Pages 1-8
Polychaete Perinereis aibuhitensis is in great demand as fishing bait in Japan. However, P. aibuhitensis for fishing bait is imported from Korea and China. In preparation for coming restrictions such as resource depletion, it is indispensable to cultivate P. aibuhitensis domestically. Understanding the life history of P. aibuhitensis is necessary for domestic aquaculture. In the present study, we analyzed serotonin, which is involved in diurnal rhythm regulation in vertebrates, as well as tryptophan metabolites (kynurenine and indole-3-acetic acid). Mass spectrometric analyses were used in this study to detect serotonin, kynurenine, and indole-3-acetic acid in the head of the P. aibuhitensis. Serotonin production, as well as kynurenine production, was found to have no significant diurnal variation in P. aibuhitensis. Notably, there was a diurnal rhythm in indole-3-acetic acid synthesis in P. aibuhitensis. These results indicate that indole-3-acetic acid, rather than serotonin, plays an important function in the diurnal rhythm of P. aibuhitensis. These findings suggest that P. aibuhitensis could be efficiently reared and produced in Japan, if we can artificially support its optimal living environment that can maintain the diurnal rhythm of indole-3-acetic acid even in high-density farming.
