2025-04-18 北海道大学
カレイ類体比重の測定風景。空中重量と水中重量を量り、アルキメデスの原理に基づき比重を計算。
<関連情報>
- https://www.hokudai.ac.jp/news/2025/04/post-1858.html
- https://www.hokudai.ac.jp/news/pdf/250418_pr2.pdf
- https://onlinelibrary.wiley.com/doi/10.1111/jfb.70036
異体類の体比重と摂餌習性の関連 Relationship between body density and feeding habit among flatfishes
Sango Nishio, Kazuki Ito, Orio Yamamura
Journal of Fish Biology Published: 27 March 2025
DOI:https://doi.org/10.1111/jfb.70036
Abstract
The body density of 16 species of flatfish was measured. Their density varied, ranging from 1.011 to 1.074 g cm-3, with benthic feeders tending to have the highest values, followed by mixed feeders and then pelagic feeders. Greenland halibut, Reinhardtius hippoglossoides, had the lowest value (1.022 ± 0.0052 g cm-3), below the density of seawater (1.026 g cm-3), indicating that this species can swim away from the sea floor with low-energy costs. In this manner, low body density may contribute to pelagic feeding. Further study of lipid content and other body characteristics of each flatfish is expected to elucidate their evolutionary traits more clearly.
