Retinomotor responses of juvenile bluefin tuna Thunnus thynnus

Masuma, Shukei; Kawamura, Gunzo; Tezuka, Nobuhiro; Koiso, Masahiko; Namba, Keiichi

doi:10.1046/j.1444-2906.2001.00244.x

Cited by 49 publications

(38 citation statements)

References 12 publications

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“…Such conditions can result in aggregations of fish that are sufficiently high to cause collisions and seriously deplete oxygen concentrations (Johansson et al 2006;Chapter 4). In other cases, problems arise because natural stimuli that are important in guiding fish behaviour are absent in culture systems, as when juvenile bluefin tuna (Thunnus thynnus), which do not see well in dim light, collide with tank or cage walls and injure themselves at the low light intensities that occur around dawn (Ishibashi et al 2009;Masuma et al 2001;Chapter 4). An additional example is seen in young guppies (Poecilia reticulata), which fail to forage efficiently on zooplankton when the light to which they are exposed lacks long wavelengths (White et al 2005;Chapter 5).…”

Section: Effects Of the External Stimuli That Control Behaviourmentioning

confidence: 99%

Conclusions: Aquaculture and Behaviour

Huntingford

Jobling

Kadri

2012

Aquaculture and Behavior

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This chapter draws together the information presented earlier in the book. Firstly, the criteria that must be met if aquaculture is to be effective and sustainable are discussed and summarised. Second, the reader is reminded that cultured fish show a broadly similar repertoire of behaviour to that of their wild counterparts, in spite of striking differences between the conditions prevailing in fish farms and in nature. A general account is then given of the problems that can arise from the expression of natural behaviour by fish in production systems. Such problems may come from the mechanisms that control behaviour, from the way in which it develops and from the fact that behaviour is the product of natural selection favouring traits that promote Darwinian fitness. By the same token, solutions can be found to such problems based on an understanding of these different aspects of fish behaviour and these are exemplified with reference to examples given in Chapters 4-10. Up to this point, attention has been focused on aquaculture as currently practised, but the final section looks to the future, attempting to anticipate how fish culture might change. Likely developments include diversification of culture species, increased intensification of aquaculture systems, greater use of genetic technologies for stock improvement, increased emphasis on environmental protection and fish welfare and increasing overlap with commercial fisheries, through capture-based aquaculture, and with conservation, through recruitment enhancement. In each case, the part that behavioural biology might play in influencing such developments is discussed.

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Section: Effects Of the External Stimuli That Control Behaviourmentioning

confidence: 99%

Conclusions: Aquaculture and Behaviour

Huntingford

Jobling

Kadri

2012

Aquaculture and Behavior

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“…Masuma et al (2001) suggested that one of the causes for the bumping is visual disorientation due to the incompatibility of the retinal adaptation with the change in the ambient light intensity at dawn. PBT in captivity have less diseases, with the exception of an iridovirus disease which breaks out in yearling tuna kept at temperatures over 21 ºC (Sawada, 2005).…”

Section: Management Of Broodstockmentioning

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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“…Miyashita [3] investigated the development of external morphology concerning swimming performance and found that BFT attain remarkable propulsion power from the juvenile period to the young stage, but their control system for swimming develops later, resulting in an inability to avoid tank walls. Masuma [4] carried out retinomotor response experiments using cultured BFT juveniles and concluded that visual disorientation due to incompatibility of retinal adaptation with the change in ambient light intensity at dawn is one of the causes of net-pen wall collisions. Torisawa [5] also examined the effect of light intensity on schooling behavior and retinal light adaptation of juvenile Pacific BFT in a water tank.…”

Section: Introductionmentioning

confidence: 99%

Analysis of juvenile tuna movements as correlated random walk

et al. 2011

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We explore how a stochastic model provides the most promising avenue towards predicting fish movement. To construct a stochastic model describing fish movement, trajectories of ten juveniles in a water tank were analyzed from a stochastic point of view. The heading angle was defined as a random variable. Our analysis found that the most probable forward heading angle was between 0°and 22.5°(probability *78%), followed by angles between 22.5°and 45°(probability *10%). We also found that the choice of future heading angle depends on the current heading angle. Therefore, we treated heading angle state as a first-order Markov process and constructed a correlated random walk model describing juvenile movement in a water tank. Our stochastic model simulated a trajectory similar to observed trajectories. We used the model as a tool for estimating the probability distribution of potential fish path outcomes. We derived the distribution of potential outcomes from a large number of simulations (N = 1000) and investigated these trajectories. We collected a set of juvenile trajectories that collided with the tank and estimated the probability of juvenile collisions with the tank.

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Retinomotor responses of juvenile bluefin tuna Thunnus thynnus

Cited by 49 publications

References 12 publications

Conclusions: Aquaculture and Behaviour

Conclusions: Aquaculture and Behaviour

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

Analysis of juvenile tuna movements as correlated random walk

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