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Enhancement of survival rate of Pacific bluefin tuna (Thunnus orientalis) larvae by aeration control in rearing tank

Published online by Cambridge University Press:  01 December 2011

Yoshizumi Nakagawa ,
Michio Kurata ,
Yoshifumi Sawada ,
Wataru Sakamoto  and
Shigeru Miyashita
Yoshizumi Nakagawa
Affiliation:
Fisheries Laboratory, Kinki University, 3153 Shirahama, 649-2211 Wakayama, Japan Department of Aquatic BioscienceFaculty of Bio-industry, Tokyo University of Agriculture, 099-2493 Hokkaido, Japan
Michio Kurata
Affiliation:
Fisheries Laboratory, Kinki University, 3153 Shirahama, 649-2211 Wakayama, Japan
Yoshifumi Sawada
Affiliation:
Fisheries Laboratory, Kinki University, 3153 Shirahama, 649-2211 Wakayama, Japan
Wataru Sakamoto*
Affiliation:
Fisheries Laboratory, Kinki University, 3153 Shirahama, 649-2211 Wakayama, Japan
Shigeru Miyashita
Affiliation:
Fisheries Laboratory, Kinki University, 3153 Shirahama, 649-2211 Wakayama, Japan
*
aCorresponding author: sakamoto@kindaisuiken.jp
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Abstract

High levels of larval mortality are a significant barrier to the artificial mass production of Pacific bluefin tuna (Thunnus orientalis). Mortality may occur when larvae sink and come into contact with the bottom of the rearing tank during the first 10 days after hatching. We evaluated the effect of flow control by aeration on the survival of T. orientalis larvae. These larvae were held in 500-L tanks in which the aeration rate was varied during the night. Larval survival increased with air supply. We documented the cross-sectional flow pattern and gravitational sinking velocities of larvae to assess the correlation between survival and circulation patterns in the tank. The sinking velocity of T. orientalis larvae at night increased with larval body density, which varied with swimbladder volume. Larvae with uninflated swimbladders sank significantly faster than larvae with inflated swimbladders. Both water circulation speed and survival increased at higher aeration rates. Our results suggest that aeration rates >900 ml min–1 may increase larval survival by counteracting sinking.

Keywords

Gas bladder inflationSwimbladderFlow fieldSurvival rateSinking velocityAerationThunnus orientalis
Type
Research Article
Information
Aquatic Living Resources , Volume 24 , Issue 4 , October 2011 , pp. 403 - 410
Copyright
© EDP Sciences, IFREMER, IRD 2011

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