2021 Volume 2021 Issue 50 Pages 39-45
Three specimens of Neomyxus leuciscus (Mugilidae) were collected from the waters around Chichi-jima Island, the Ogasawara Islands. One specimen (38.35 mm SL) provided new knowledge concerning the species’ initial morphological features and changes that occur from juvenile to adult: snout becomes relatively longer and teeth increase in number and size with growth. It is considered that these changes reflect the food habits as the species adapts to being a herbivore. Additionally, one specimen (135.25 mm SL) examined in this study suggests that mature individuals may exist in the waters around Chichi-jima Island. These specimens are biogeographically important in indicating that this species is reproducing albeit to a small degree in the waters around Chichi-jima Island.