Present address: Miyazu Station, National Center for Stock Enhancement, Fisheries Research Agency, 1721 Odashukuno, Miyazu, Kyoto 626-0052, Japan.
Turbulence effect on survival and feeding of Pacific bluefin tuna Thunnus orientalis larvae, on the basis of a rearing experiment
Article first published online: 1 FEB 2008
© 2008 Japanese Society of Fisheries Science
Volume 74, Issue 1, pages 48–53, February 2008
How to Cite
KATO, Y., TAKEBE, T., MASUMA, S., KITAGAWA, T. and KIMURA, S. (2008), Turbulence effect on survival and feeding of Pacific bluefin tuna Thunnus orientalis larvae, on the basis of a rearing experiment. Fisheries Science, 74: 48–53. doi: 10.1111/j.1444-2906.2007.01495.x
- Issue published online: 1 FEB 2008
- Article first published online: 1 FEB 2008
- Received 30 January 2007. Accepted 20 September 2007.
- bluefin tuna;
- feeding rate;
- initial feeding larvae;
- turbulence energy dissipation rate;
ABSTRACT: Physical conditions such as oceanic turbulence related to food availability are considered to be important factors affecting fish larval survival. Rearing experiments were conducted to elucidate the effects of turbulence on the survival and feeding rates during the initial feeding period of Pacific bluefin tuna Thunnus orientalis. Six levels of turbulence intensity were provided by changing flow rates from pipes set on the bottom of rearing tanks. The result showed a dome-shaped relationship between turbulence level and survival rate, in which the feeding rate appeared higher at a logged turbulence energy dissipation rate of −6.32, and decreased at both higher and lower turbulence levels. Compared with the turbulence intensity in the ocean, the optimal turbulence level for Pacific bluefin tuna larvae corresponded to the turbulence caused by sea surface winds with speeds of 4–12.5 m/s. The estimated optimal turbulence intensity for Pacific bluefin tuna larvae is comparable to that for yellowfin tuna Thunnus albacares.