North Pacific Anadromous Fish Commission

Technical Report 15

Table of Contents

Effect of Temperature and Amount of Food on the Growth Rate / Aerobic Scope of Juvenile Chum Salmon

Authors:
Yuki Iino, Takashi Kitagawa, Takaaki K. Abe, Tsuyoshi Nagasaka, Yuichi Shimizu, Katsuhiko Ota, Takuya Kawashima, and Tomohiko Kawamura

Abstract Excerpt:
In Japan, the return rates of chum salmon (Oncorhynchus keta) have declined recently (NPAFC 2018). The decline appears to be influenced by high juvenile mortality during northward migration to the Okhotsk Sea (Urawa 2000). In particular, the high juvenile mortality due to low growth rates during the long northward migration to the Okhotsk Sea can occur in the Sanriku coastal area of Honshu island, Japan (Honda et al. 2017). Their growth depends on coastal environmental conditions such as water temperature and prey abundance (Weatherley and Gill 1995), but how these factors lead to low growth is still unknown. Because of low food intake and high energy expenditures on respiration and locomotion, they probably allocate less energy to their growth. Therefore, it is necessary to evaluate the metabolic performance of juvenile chum salmon, but few studies have considered their energetics. The aim of this study was to determine how the metabolic performance of juvenile chum salmon under different food levels and temperatures affects their growth rates.

*This is the first paragraph of an extended abstract. Download the full abstract below.

DOI:
https://doi.org/10.23849/npafctr15/82.84.

Citation

Iino, Y., T. Kitagawa, T.K. Abe, T. Nagasaka, Y. Shimizu, K. Ota, T. Kawashima, and T. Kawamura.  2019.  Effect of temperature and amount of food on the growth rate/aerobic scope of juvenile chum salmon.  N. Pac. Anadr. Fish Comm. Tech. Rep. 15: 82–84.  https://doi.org/10.23849/npafctr15/82.84.