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Influence of initial swimbladder inflation failure on survival of P acific bluefin tuna, T hunnus orientalis ( T emminck and S chlegel), larvae
Author(s) -
Kurata Michio,
Ishibashi Yasunori,
Takii Kenji,
Kumai Hidemi,
Miyashita Shigeru,
Sawada Yoshifumi
Publication year - 2014
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12027
Subject(s) - thunnus , biology , tuna , larva , hatching , fishery , zoology , fish <actinopterygii> , ecology
This study investigated the influence of initial swimbladder inflation ( ISI ) failure on survival of P acific bluefin tuna ( PBT ), T hunnus orientalis , larvae to prevent mass mortality due to sinking death. In Experiment 1, swimbladder inflation frequency and survival within an ISI promoted ( PS ) group, for which surface film of rearing water was removed, and a group without ISI promotion ( NPS ) were compared in 20 and 30 kL tanks. The PS group demonstrated significantly higher swimbladder inflation frequency and increased survival than the NPS group within 20 kL tanks at 9 days post hatching (dph). Similar tendencies were observed within 30 kL tanks. In Experiment 2, larval distribution and swimbladder inflation frequency in the night‐time were examined through larval sampling within the upper and middle layers of the water column and tank bottom within 1.6 and 30 kL tanks at 5 dph. Larvae at tank bottom had higher distributional density and significantly lower swimbladder inflation frequency than those distributed in the upper and middle layers within 1.6 kL tanks. Similar tendencies were observed within 30 kL tanks. Results of this study suggest the improvement of larval survival due to prevention of sinking death through ISI promotion in mass‐scale PBT larviculture.