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Influence of swimbladder inflation failure on mortality, growth and lordotic deformity in Pacific bluefin tuna, Thunnus orientalis, (Temminck & Schlegel) postflexion larvae and juveniles.

Authors :
Kurata, Michio
Ishibashi, Yasunori
Seoka, Manabu
Honryo, Tomoki
Katayama, Shigeru
Fukuda, Hiromu
Takii, Kenji
Kumai, Hidemi
Miyashita, Shigeru
Sawada, Yoshifumi
Source :
Aquaculture Research; Jun2015, Vol. 46 Issue 6, p1469-1479, 11p
Publication Year :
2015

Abstract

This study examined the influence of swimbladder inflation ( SBI) failure on mortality (Experiment 1), lordotic deformity (Experiment 2) and growth (Experiment 1, 2) in Pacific bluefin tuna, Thunnus orientalis, postflexion larvae and juveniles by producing larvae lacking inflated swimbladders. Experiment 1 was conducted for postflexion larvae to juveniles (from 18 to 30 days-post-hatch; dph). Mortality was not significantly different between the fish with ( WIS) and without ( WOIS) inflated swimbladders. Standard length ( SL) and body weight ( BW) were significantly smaller in WOIS than WIS. Moreover, the SBI was found in WOIS after postflexion stage. In Experiment 2, two examination trials were conducted on SBI, vertebral deformity and growth for juvenile stage. Lordotic deformities were found neither in the WOIS nor in the WIS. Although SL and BW were significantly smaller in WOIS than WIS at 22 dph, after 37 dph no significant differences were found between them. The results of Experiment 1 and 2 indicate that SBI failure causes growth retardation until juveniles of 30 dph; however, it does not cause growth retardation in juveniles after 37 dph and mortality of postflexion larvae and juveniles. Moreover, SBI failure did not cause lordotic deformity in PBT differently from many other fish. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
1355557X
Volume :
46
Issue :
6
Database :
Complementary Index
Journal :
Aquaculture Research
Publication Type :
Academic Journal
Accession number :
102270838
Full Text :
https://doi.org/10.1111/are.12304