Turbulence effect on survival and feeding of Pacific bluefin tuna Thunnus orientalis larvae, on the basis of a rearing experiment

Kato, Yoshiki; Takebe, Takayuki; Masuma, Shukei; Kitagawa, Takashi; Kimura, Shingo

doi:10.1111/j.1444-2906.2007.01495.x

Cited by 19 publications

(10 citation statements)

References 18 publications

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“…For the improvement of egg and larval quality, future work needs to consider improved broodstock diets that may improve egg quality and fecundity (Watanabe and Vassallo‐Agius, 2003). The availability of certain turbulence levels in the larval rearing tanks, which have shown improvements in feeding and survival rates of yellowfin tuna ( Thunnus albacares ) (Kimura et al., 2004) and Pacific bluefin tuna (Kato et al., 2008) should also be implemented in ABFT in order to achieve a better success in larval rearing. Once the ABFT begin feeding, more work should be done on the type of feeds that are fed to the larvae.…”

Section: Resultsmentioning

confidence: 99%

Spawning induction and large-scale collection of fertilized eggs in captive Atlantic bluefin tuna (Thunnus thynnus L.) and the first larval rearing efforts

Metrio

Bridges

Mylonas³

et al. 2010

Journal of Applied Ichthyology

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Section: Resultsmentioning

confidence: 99%

Spawning induction and large-scale collection of fertilized eggs in captive Atlantic bluefin tuna (Thunnus thynnus L.) and the first larval rearing efforts

Metrio

Bridges

Mylonas³

et al. 2010

Journal of Applied Ichthyology

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“…It is difficult to specify mechanisms inducing converse effects of the egg size and the mixing of rearing water on the growth rate of PBT larvae. Kato et al () reported that a strong water current (turbulence) induced a low feeding incidence. However, it is reported that PBT larvae are daytime feeders (Uotani et al ), and in the present study, we conducted the mixing of rearing water by strong aeration during the night.…”

Section: Discussionmentioning

confidence: 99%

Factors Influencing Early Survival and Growth of Laboratory‐reared Pacific Bluefin Tuna, Thunnus orientalis, Larvae

Tanaka

Kumon

Higuchi³

et al. 2017

J World Aquaculture Soc

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The collection of fertilized eggs for mass culture of Pacific bluefin tuna (PBT) relies on the spontaneous spawning of broodstock in captivity, and the spawning season of the broodstock is generally from mid‐May to September. The diameter of fertilized eggs from the broodstock decreases during the spawning season. To investigate the influence of three potential factors, the egg diameter (larger or smaller), the rearing water temperature (25 or 28 C), and the aeration rate during the night (strong or weak), on early survival and on growth of PBT larvae, replicate trials were conducted to assess these three factors until 7 d after hatching (d.a.h.). At 7 d.a.h., survival rates of larvae reared with strong nighttime aeration were found by a three‐way ANOVA to be significantly higher than for larvae reared with weak aeration. Furthermore, growth rates of PBT larvae hatched from larger eggs were significantly faster than those from smaller eggs. However, a significant difference in the survival rate was not detected for the factors, egg diameter and rearing water temperature. The results indicate that rearing with strong nighttime aeration significantly improved the early survival of PBT larvae and the egg diameter (a proxy for egg quality) and influenced growth.

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“…In these studies, it was found that manipulating the aeration levels to vertically mix the rearing water reduced the number of larvae sinking to the tank bottom. This may be the case in PBT larviculture, also, as water flow significantly affects the survival and feeding of PBT larvae (Kato et al, 2008).…”

Section: Rearing In the Early Larval Stagementioning

confidence: 99%

A review of the broodstock management and larviculture of the Pacific northern bluefin tuna in Japan

2011

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We reviewed research on the broodstock management and larviculture of the Pacific northern bluefin tuna (PBT) Thunnus orientalis in Japan. Japan has been at the forefront of PBT research since 1970 due to the participation by federal and prefectural governments and universities in a national project aimed to optimize productivity of the sea around Japan. In 1979, scientists at Kinki University succeeded in the first spontaneous spawning in captivity by the broodstock of 5 year-old PBT. Successful spawning was also performed in 1980 and 1982, but no spawning then occurred until 1993, when Maruha Nichiro Holdings, Inc. (MNH) and Nippon Formula Feed Manufacturing Company, Ltd. (NFFMC) became involved in tuna farming and succeeded in the spawning of four-year-old broodstock. Since then, successful spawning of PBT in captivity has been reported from several sites as well as spawning in Kinki Univ. since 1994. With the successful spawning of PBT, the Fisheries Research Agency (FRA; formerly, Japan Sea Farming Association) of Kinki University, in conjunction with MNH, NFFMC, and Takuyo Ltd., have actively carried out research on and development of tuna larviculture technology. Thus, knowledge about broodstock management and larviculture has accumulated in Japan, but technical problems with larviculture still remain to be solved. There are 9 sites of successful spawning in net pens in Japan so far. At 4 of these sites in regions around Amami Island, yearly spawning has stably occurred. We have been accumulating data about the period of maturation, environmental key factors triggering the spawning, the age of onset of spawning, and the pattern of spawning through measurement of the ambient environment, gonad morphometry, endocrinology, mitochondrial DNA analysis, and daily careful observation of broodstock. Research on PBT larviculture at Kinki University, FRA, MNH, NFFMC, and Takuyo have succeeded in producing tens of thousands of hatchery-raised juveniles. As a result, Kinki University succeeded in establishing the full life cycle of PBT in captivity, and also achieved its aquaculture life cycle. However, solutions are needed for the remaining technological issues of PBT larviculture, including sinking syndrome, where larvae die on the bottom of the tank during the early phase of larviculture, the search for appropriate food (species, size, and nutrition) around the transition stage from larva to juvenile, cannibalism and collision against walls in the juvenile, and malformation and viral diseases in the young stage.

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Turbulence effect on survival and feeding of Pacific bluefin tuna Thunnus orientalis larvae, on the basis of a rearing experiment

Cited by 19 publications

References 18 publications

Spawning induction and large-scale collection of fertilized eggs in captive Atlantic bluefin tuna (Thunnus thynnus L.) and the first larval rearing efforts

Spawning induction and large-scale collection of fertilized eggs in captive Atlantic bluefin tuna (Thunnus thynnus L.) and the first larval rearing efforts

Factors Influencing Early Survival and Growth of Laboratory‐reared Pacific Bluefin Tuna, Thunnus orientalis, Larvae

A review of the broodstock management and larviculture of the Pacific northern bluefin tuna in Japan

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