NDLI: Ontogeny of swim bladder inflation and caudal fin aspect ratio with reference to vertical distribution in Pacific bluefin tuna Thunnus orientalis larvae

Content Provider	Springer Nature Link
Author	Ina, Yoshiaki Sakamoto, Wataru Miyashita, Shigeru Fukuda, Hiromu Torisawa, Shinsuke Takagi, Tsutomu
Copyright Year	2014
Abstract	It is necessary to understand the processes involved in sinking death in Pacific bluefin tuna Thunnus orientalis aquaculture in order to develop methods to prevent or minimize this problem. We observed the nighttime vertical distribution of Pacific bluefin tuna in the water column on 2–9 DAH and the morphological characteristics of the larvae, in order to clarify the processes involved in sinking death. A cuboid tank (height 300 cm) was used to measure vertical distribution. The number of larvae was counted in each of 4 regions in the observation tank: upper layer (water depth 0–100 cm), middle layer (100–200 cm), lower layer (200–300 cm), and bottom area. The distribution of larvae in these regions at 4 days after hatching was polarized to the upper layer and bottom area. Individuals with inflated swim bladders were observed in the upper layer 3 days after hatching. No larvae with inflated swim bladders were observed in the bottom area on any day after hatching. Total body length and caudal fin aspect ratio of larvae with both inflated and un-inflated swim bladders were greater in the upper layer than those of larvae in the bottom area. Larvae with un-inflated swim bladders that failed to develop sufficiently for swimming sank to the tank bottom and died. Swim bladder development and caudal fin swimming ability are strongly related to sinking death.
Starting Page	1293
Ending Page	1299
Page Count	7
File Format	PDF
ISSN	09199268
Journal	Fisheries Science
Volume Number	80
Issue Number	6
e-ISSN	14442906
Language	English
Publisher	Springer Japan
Publisher Date	2014-09-18
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pacific bluefin tuna Larvae Body density Swimming ability Sinking death Caudal fin Aspect ratio Fish & Wildlife Biology & Management Freshwater & Marine Ecology Food Science
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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Diel and ontogenetic body density change in Pacific bluefin tuna, Thunnus orientalis (Temminck and Schlegel), larvae

Testes maturation of reared Pacific bluefin tuna Thunnus orientalis at two-plus years old

Reproductive biology of female Pacific bluefin tuna Thunnus orientalis from south-western North Pacific Ocean

Development of phototaxis in the early life stages of Pacific bluefin tuna Thunnus orientalis

Myxosporean and microsporidian infections in cultured Pacific bluefin tuna Thunnus orientalis in Japan

Promotion of initial swimbladder inflation in Pacific bluefin tuna, Thunnus orientalis (Temminck and Schlegel), larvae

Ontogenetic changes in RNA, DNA and protein contents of laboratory-reared Pacific bluefin tuna Thunnus orientalis

Dietary utility of enzyme-treated fish meal for juvenile Pacific bluefin tuna Thunnus orientalis

Sizes of adult bluefin tuna Thunnus orientalis in different areas of the western Pacific Ocean

Ontogeny of swim bladder inflation and caudal fin aspect ratio with reference to vertical distribution in Pacific bluefin tuna Thunnus orientalis larvae

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Diel and ontogenetic body density change in Pacific bluefin tuna, Thunnus orientalis (Temminck and Schlegel), larvae

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Development of phototaxis in the early life stages of Pacific bluefin tuna Thunnus orientalis

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Ontogenetic changes in RNA, DNA and protein contents of laboratory-reared Pacific bluefin tuna Thunnus orientalis

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Ontogeny of swim bladder inflation and caudal fin aspect ratio with reference to vertical distribution in Pacific bluefin tuna Thunnus orientalis larvae