open access

https://hdl.handle.net/2115/51002

Vertical distribution and feeding habits of Japanese sandfish (Arctoscopus japonicus) larvae and juveniles off Akita Prefecture in the Sea of Japan

日本語

Mysidacea

2011-12-20

日本水産増殖学会

水産増殖

59(4)

615-630

To better understand the bathymetric distribution and feeding habits of Japanese sandfish (Arctoscopus japonicus) larvae and juveniles off Akita Prefecture, their abundance, diet, and prey size distributions were investigated from February to May 2009. Larvae and juveniles were distributed along the sea floor at temperatures of 7.3-12.2℃, and they ontogenetically shifted from the coastal spawning ground (0.5-5 m bottom depth) to offshore areas (bottom depth ≥60 m). Juveniles were not found on the bottom at temperatures ≥13.2℃. Newly hatched larvae had a notochord length of ca. 12mm and morphologically well-developed compared with other marine fish larvae. Pelagic and demersal copepodites were dominant in the diet of 12-30 mm long sandfish larvae, and mysids were dominant in the diet of ≥40 mm long juveniles. The mysid Xenacanthomysis pseudomacropsis might be an important prey item for sandfish juveniles in their nursery ground because it is larger than other pelagic and demersal crustacean prey, and it co-occurs with sandfish juveniles.

学術雑誌論文

Version of Record

© 2011 日本水産増殖学会

0371-4217

2185-0194

AN00124667