A paper on the vision of cuttlefish (file attached)

Recently, seeing that some rods are even in short supply, it is clear that interest in squid fishing has increased significantly.

When providing information through blogs and providing examples of data, I try to ensure objectivity by specifying the source. Today, I would like to explain the paper that served as the basis for the statement in the previous post titled “Vision of the Cuttlefish” that “The visual acuity of the cuttlefish is known to be 0.6 to 0.7, but according to a paper published in 2007 by the Mie University Research Institute in Japan, which has conducted extensive research on the vision of cuttlefish, the vision of the cuttlefish is 0.63, and that of the flying squid is a whopping 1.37.”

The title of the paper is ‘Basic Study on the Vision of Squid’ in Japanese, and the translation is ‘Basic Study on the Vision of Squid’. A copy can be viewed by downloading the file below.

https://mie-u.repo.nii.ac.jp/record/10325/files/2006B044.pdf

This paper was written by Akihito Makino, who majored in biological resources at Mie University in Japan, when he was completing his master’s course. As cited in the paper, it states that the absorption wavelength of squid, including bigfin reef squid, is approximately 490 nanometers (nm), as announced in a 1958 paper by Hubbard and George in the United States (Pigment Migration and Adaptation in the Eye of the Squid, Loligo pealei), and that squid have the ability to react to light, and in particular, the ability to distinguish polarization, which can be seen in the citations in this paper.

Aside from these points, most of the paper seems to be difficult to understand and more than half of the explanation is about the experimental method, so it may not be very useful information for anglers. However, Table 3 on page 55, a comparison of the number of photoreceptor nuclei and visibility of six types of squid, is considered necessary information for anglers, and in particular, the fact that the visual axis of the cuttlefish shown in the figure is facing downwards seems to show the importance of pole movement in egging fishing.