open access

https://hdl.handle.net/2115/38644

Seasonal change in daily ration of brown sole Pleuronectes herzensteini in the coastal waters of northern Niigata Prefecture, Japan

英語

1995

Alaska Sea Grant Collage Program, University of Alaska

Proceedings of the International Symposium on North Pacific Flatfish

261-284

International Symposium on North Pacific Flatfish. 26-28 October 1994. Anchorage, Alaska, USA.

Stomach contents of 2,407 brown sole Pleuronectes herzensteini collected from the Sea of Japan off northern Niigata Prefecture, Japan, during 1982-1985 were examined to estimate daily ration. Samples were collected throughout the 24-h day. Instantaneous evacuation rate (R) was estimated from the depletion of stomach contents (percent body weight) with time during the night for using Elliott and Persson's (1978) model. When the obvious feeding periodicity was not seen, R was estimated from the relationship between R and temperature (T) described by Durbin et al. (1983); R=0.043e^0.115T. Gastric evacuation rates were used in conjunction with the field data to estimate the daily ration. Brown sole fed mainly on polychaetes through the year except April 1984. Bregmaceros japonicus (Pisces; Bregmacerotidae) was an important component of the diet in April 1984. Daily ration was high during the post-spawning season and highest in May (4.75% of body weight). In autumn and winter, the daily ration was low and was lowest in February/March, just before the spawning season (0.48% of body weight). The seasonal variation of the daily ration seems to be closely related to physiological conditions. It is estimated that the annual ration was about 831.5% of body weight and about 8,870 metric tons of food were consumed by brown sole per year in this study area.

会議発表論文

Version of Record

1995. Proceedings of the International Symposium on North Pacific Flatfish. Alaska Sea Grant College Program, University of Alaska Fairbanks.