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Enhancement of survival rate of Pacific bluefin tuna (Thunnusorientalis) 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 barrierto the artificial mass production of Pacific bluefin tuna (Thunnusorientalis). Mortality may occur when larvae sink and comeinto contact with the bottom of the rearing tank during the first10 days after hatching. We evaluated the effect of flow controlby aeration on the survival of T. orientalis larvae.These larvae were held in 500-L tanks in which the aeration ratewas varied during the night. Larval survival increased with airsupply. We documented the cross-sectional flow pattern and gravitationalsinking velocities of larvae to assess the correlation between survivaland circulation patterns in the tank. The sinking velocity of T. orientalis larvaeat night increased with larval body density, which varied with swimbladdervolume. Larvae with uninflated swimbladders sank significantly fasterthan larvae with inflated swimbladders. Both water circulation speedand survival increased at higher aeration rates. Our results suggestthat aeration rates >900 ml min–1 may increase larval survival bycounteracting 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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