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MASUMA Shukei

    Aquaculture Research Institute, Kindai University　Specially Appointed Professor
Last Updated :2024/04/25

Researcher Information

Degree

  • Doctor of Agriculture（2006/03 Kyushu University）

J-Global ID

Research Interests

  • 海産魚類増養殖   

Research Areas

  • Other / Other

Published Papers

  • Ryuichiro Aoki; Shukei Masuma; Youhei Washio; Hisashi Chuda; Keitaro Kato
    Fisheries Science Springer Science and Business Media LLC 0919-9268 2024/04
  • Mai Sakakibara; Ryuichiro Aoki; Shukei Masuma; Osamu Nakamura; Sho Shirakashi; Shigeyuki Tsutsui
    Developmental & Comparative Immunology Elsevier BV 105113 - 105113 0145-305X 2023/12 [Refereed]
  • Shukei Masuma; Ryuichiro Aoki
    Aquaculture International Springer Science and Business Media LLC 0967-6120 2023/11 [Refereed]
  • HISASHI CHUDA; KOTARO SUGANO; HIROMU NAKATSUKASA; NOBUHIRO HATTORI; YASUHISA KOBAYASHI; SHUKEI MASUMA
    NIPPON SUISAN GAKKAISHI Japanese Society of Fisheries Science 88 (6) 485 - 493 0021-5392 2022 [Refereed]
  • Shukei Masuma; Yuki Kusunoki; Ryuichiro Aoki
    AQUACULTURE RESEARCH WILEY 53 (4) 1268 - 1275 1355-557X 2021/11 [Refereed]
     
    Longtooth grouper (LG), Epinephelus bruneus, which is a protogynous hermaphrodite fish, is a highly valued grouper in Japan. Recently, LG farming and larviculture have started in subtropical waters but the reproductive information is scarce. We conducted two experiments to estimate the breeding season for LG held in a sea cage at Amami Island, Japan. Seasonal changes of plasma sex steroid (E2 and 11-KT) levels were measured in Experiment 1. Blood samples were collected from April to July and September 2018 and February 2019. E2 levels of the females increased from February (0.43 +/- 0.10 ng/ml) and were significantly higher between April (0.97 +/- 0.14 ng/ml) and May (0.66 +/- 0.07 ng/ml) compared with those of June, July, and September. Eleven-KT levels of males were also higher between February and June. Spermiation responses indicating maturity of testis were examined throughout the year in Experiment 2. Spermiation was also observed between February and June. These results suggested that the breeding season of LG in subtropical regions was between April and May, with a residual period in June, which was earlier than those of temperate sites of Mainland Japan.
  • Yuta Matsuura; Toyohiro Nishioka; Jun Satoh; Yoshiko Shimahara; Tomomasa Matsuyama; Tomokazu Takano; Ikunari Kiryu; Yasuhiko Kawato; Sachiko Terashima; Shukei Masuma; Chihaya Nakayasu
    AQUACULTURE ELSEVIER 539 0044-8486 2021/06 
    The market for Pacific bluefin tuna (Thunnus orientalis) is expanding as global consumption increases. Meeting this demand has led to overfishing and consequent depletion of wild populations, resulting in a focus on aquaculture as an alternative to fishing. However, under the crowded conditions typical of tuna aquaculture settings, infectious diseases are a common problem associated with considerable economic losses, especially with regard to Pacific bluefin tuna, which is a high-priced species. Studying diseases in Pacific bluefin tuna requires techniques that enable experimental infection; however, no promising methods are available due to the difficulty of handling these fish, including transportation, retention, and injection. In the present study, therefore, we developed a method for experimental infection of juvenile Pacific bluefin tuna with red seabream iridovirus (RSIV), which causes an acute and highly contagious disease in this species. The route of experimental infection was validated using Pacific bluefin tuna and greater amberjack (Seriola dumerili), which is used as a model species susceptible to the disease. Oral infection with the virus was found to be suitable for reproducing red seabream iridoviral disease (RSIVD). A high copy number of the RSIV genome was detected in Pacific bluefin tuna that died following RSIV experimental infection, indicating that the virus efficiently replicated in the infected fish. In addition to virus detection, a histopathologic abnormality specific to RSIV infection was detected in the infected fish. These results indicate that experimental infection via the oral route is effective for reproducing RSIVD in Pacific bluefin tuna.
  • S. Abe; T. Takagi; S. Torisawa; K. Abe; H. Habe; N. Iguchi; K. Takehara; S. Masuma; H. Yagi; T. Yamaguchi; S. Asaumi
    Aquacultural Engineering Elsevier BV 93 102146 - 102146 0144-8609 2021/05 
    In marine aquaculture, fish populations constantly decrease throughout the cultivation period because of mortality and escape. Current production management systems provide limited opportunities to count the cultured fish, making it difficult to estimate accurately the fish population in the cage. To overcome this problem, an automatic fish identifying method based on particle tracking velocimetry (PTV) flow visualization technology is proposed in this paper. The proposed method utilizes an image processing unit that extracts individual fish from the acquired image and a motion analysis unit that calculates the motion vector for each individual. Thus, the accuracy of the extraction results in the image processing unit affects the system's counting results. To validate the efficiency and robustness of the image extraction performed by the image processing unit, individuals were extracted from images using the open-source image deep learning semantic segmentation method (SegNet), which is able to distinguish between the background and foreground in the images via analysis at the pixel level. SegNet is able to improve the image discrimination performance by multiplying the learning paths, and the robustness of the detection results can be ensured by changing the layer structure according to the detection target. Accordingly, the use of SegNet was evaluated in terms of the number of layers and images in the training set. The results of this study indicate that the application of SegNet with PTV technology represents a promising method for the automatic identifying and behavioral tracking of fish in an aquaculture net cage.
  • Kentaro Higuchi; Yukinori Kazeto; Yuichi Ozaki; Toshiya Yamaguchi; Yukinori Shimada; Yoshiaki Ina; Satoshi Soma; Yoshitaka Sakakura; Rie Goto; Takahiro Matsubara; Issei Nishiki; Yuki Iwasaki; Motoshige Yasuike; Yoji Nakamura; Aiko Matsuura; Shukei Masuma; Tetsushi Sakuma; Takashi Yamamoto; Tetsuji Masaoka; Takanori Kobayashi; Atushi Fujiwara; Koichiro Gen
    SCIENTIFIC REPORTS NATURE PUBLISHING GROUP 10 (1) 9351 - 9351 2045-2322 2020/06 
    An amendment to this paper has been published and can be accessed via a link at the top of the paper.
  • 八木洋樹; 浅井七望; 白樫正; 岡田貴彦; 高岡治; 升間主計
    魚病研究 55 (3) 0388-788X 2020
  • Ryuichiro Aoki; Hisashi Chuda; Youhei Washio; Shukei Masuma; Keitaro Kato
    FISHERIES SCIENCE SPRINGER JAPAN KK 86 (1) 57 - 64 0919-9268 2020/01 [Refereed]
     
    The aquaculture of greater amberjack Seriola dumerili is of considerable research interest worldwide. The larviculture methods employed to culture this species, however, are still under development, and the majority of farms still rely on wild-caught juveniles. One of the problems associated with the hatchery production of this species is the optimal selection of broodstock to ensure a stable supply of high-quality eggs. Specifically, no reliable low-stress sex-discrimination technique is currently available for selecting broodstock of this species. This study investigated the efficacy of a hormone-based sex-discrimination method in full-cycle cultured S. dumerili, ranging in age from 412 to 1150 days after hatching (DAH). Plasma concentrations of the female hormone 17 beta-estradiol (E2) and the male hormone 11-ketotestosterone (11-KT) were measured in both spawning and non-spawning seasons, and the optimal threshold levels for sex discrimination were estimated using a receiver operating characteristic curve. Sex discrimination using E2 produced several false positives in younger fish, and had an overall accuracy of 78.7%. However, sex discrimination using 11-KT had an accuracy of 96.7%, even in 412 DAH fish. This study demonstrated that sex discrimination using 11-KT is a reliable method for optimizing the sex ratio of S. dumerili broodstock, even before the broodstock mature.
  • Kentaro Higuchi; Yukinori Kazeto; Yuichi Ozaki; Toshiya Yamaguchi; Yukinori Shimada; Yoshiaki Ina; Satoshi Soma; Yoshitaka Sakakura; Rie Goto; Takahiro Matsubara; Issei Nishiki; Yuki Iwasaki; Motoshige Yasuike; Yoji Nakamura; Aiko Matsuura; Shukei Masuma; Tetsushi Sakuma; Takashi Yamamoto; Tetsuji Masaoka; Takanori Kobayashi; Atushi Fujiwara; Koichiro Gen
    SCIENTIFIC REPORTS NATURE PUBLISHING GROUP 9 (1) 13871 - 13871 2045-2322 2019/09 
    In bluefin tuna aquaculture, high mortalities of hatchery-reared juveniles occur in sea cages owing to wall collisions that are caused by high-speed swimming in panic due to changes in illuminance. Here, we report that targeted gene mutagenesis of the ryanodine receptor (RyR1b), which allows the sarcoplasmic reticulum to release Ca2+ in fast skeletal muscle, using highly active Platinum TALENs caused slow swimming behaviour in response to external stimuli in Pacific bluefin tuna (PBT) larvae. This characteristic would be a useful trait to prevent wall collisions in aquaculture production. A pair of Platinum TALENs targeting exons 2 and 43 of the PBT ryr1b gene induced deletions in each TALEN target site of the injected embryos with extremely high efficiency. In addition, ryr1b expression was significantly decreased in the mutated G0 larvae at 7 days after hatching (DAH). A touch-evoked escape behaviour assay revealed that the ryr1b-mutated PBT larvae swam away much less efficiently in response to mechanosensory stimulation at 7 DAH than did the wild-type larvae. Our results demonstrate that genome editing technologies are effective tools for determining the functional characterization of genes in a comparatively short period, and create avenues for facilitating genetic studies and breeding of bluefin tuna species.
  • 塚正泰之; 山下洋; 高島秋則; 松浦良平; 安藤正史; 福田隆志; 山本眞司; 那須敏郎; 有路昌彦; 升間主計
    水産増殖 66 (3) 235 - 242 0371-4217 2018/09 [Refereed]
     
    Abstract: Japanese eel-flavored Amur catfish, Silurus asotus (JEC), is produced as an alternative to the endangered Japanese eel Anguilla japonica (JE). In this study, the quality of JEC was evaluated and compared with that of JE, wild Amur catfish (WC), and cultured Amur catfish fed pellets usually given to carp or red seabream. Among the griddle-cooked fish filet, the lipid content was the highest in JE (31.8%), followed by JEC (5.5%) and WC (2.2%). The glutamate and inosine monophosphate (IMP) concentrations were the highest in cooked JEC (0.96 and 8.8 μmol/g, respectively) and the lowest in cooked JE (0.42 and 4.4 μmol/g, respectively). Docosahexaenoic acid components of the lipid of JEC were the highest at 7.67%, whereas that of JE was 3.3%. In the sensory evaluation, the fatty taste score for JE was significantly higher than that for all Amur catfish groups, the latter among which showed no significant difference in fatty taste scores. The overall sensory evaluation score for WC was significantly lower than that for the other catfish. JEC had a reduced foul smell compared to WC meat, and it countered its low lipid content compared to JE with its high levels of glutamate and IMP.
  • Hisashi Chuda; Kazuki Ieda; Sho Shirakashi; Shukei Masuma
    AQUACULTURE ELSEVIER SCIENCE BV 491 346 - 350 0044-8486 2018/04 [Refereed]
     
    Interspecific hybrids of marine fish are becoming popular for aquaculture. The advantageous characteristics of hybrid fish include high growth rates, enhanced feed conversion rates, better appearance, high tolerance to environmental stress, and increased resistance to certain diseases. A new hybrid grouper Kue-Tama, female Epinephelus bruneus x male E. lanceolatus has recently been established. This hybrid showed significantly higher growth than that by E. bruneus and is considered a promising new species for aquaculture, especially in temperate areas where the slow growth of E. bruneus has prevented stable farming practices. The present study compared the resistance of Kue-Tama, its maternal parent E. bruneus and E. septemfasciatus, another popular grouper for farming, against the skin fluke, Benedenia epinepheli, which is a problematic parasite in grouper farming. The result of the cohabitation experimental infection showed that E. septemfasciatus was the most resistant to the skin fluke, followed by Kue-Tama and then E. bruneus. There appeared to be a negative relationship between the amount of mucus produced and the parasite intensity suggesting a resistance to skin flukes though the dry-weight of mucus collected from a given skin surface area did not differ between the three groupers. These results demonstrated that Kue-Tama has another favorable characteristic for aquaculture, in addition to their higher growth rate.
  • Osamu Murata; Shota Itakura; Shinji Yamamoto; Nobuhiro Hattori; Michio Kurata; Hiromi Ohta; Shukei Masuma
    Aquaculture Science Japanese Society for Aquaculture Research, Nishimura Toushadou Ltd. 65 (1) 93 - 95 2185-0194 2017 [Refereed]
     
    In order to breed a faster-growing grouper, the longtooth grouper, Epinephelus bruneus (LG), was hybridized with the giant grouper, E. lanceolatus (GG). Eggs from a female LG that was injected with HCG were inseminated by the fresh sperm of LG and cryo-preserved sperm of GG obtained from a fish in Malaysia. Normal hatching rate was 8.8% (LGGG) and 18.6% (LG), respectively. The LGGG and LG larvae were raised for 61 days after hatching the survival and mean size were 17.5, 42.0% and 63.6±11.3, 36.2±8.7 mm, respectively. This new hybrid grouper would be a promising-breed for aquaculture.
  • Takayuki Takebe; Takeo Kurihara; Nobuaki Suzuki; Kentaro Ide; Hideki Nikaido; Yosuke Tanaka; Satoshi Shiozawa; Hitoshi Imaizumi; Shukei Masuma; Yoshitaka Sakakura
    FISHERIES SCIENCE SPRINGER JAPAN KK 78 (2) 343 - 350 0919-9268 2012/03 
    We conducted a rearing experiment on Pacific bluefin tuna (PBT) larvae, which originated from one female broodstock, and determined the growth history of the larvae to clarify when the growth difference occurs. We investigated the otolith microstructure of the PBT larvae to examine the individual growth history and to predict the age and body size at the onset of individual growth difference. Since total length (TL) of fish can be back-calculated from otolith radius, we back-calculated TLs of 100 fish of 19 days post hatch (dph) divided into three size groups (small, intermediate, large). Growth difference was recognized from 3 dph (mouth opening), and the difference became larger thereafter. Growth of large-size fish was assumed to be promoted by the feeding conditions of PBT larvae.
  • Takashi Yokota; Masaharu Machida; Hiroyuki Takeuchi; Shukei Masuma; Reiji Masuda; Nobuaki Arai
    AQUACULTURE ELSEVIER 319 (1-2) 290 - 297 0044-8486 2011/09 
    The anti-predatory performance of hatchery-reared red tilefish (Branchiostegus japonicus) using tube-shaped burrows was studied together with the behavioral characteristics of potential predators, the white spotted conger (Conger myriaster) and the marbled rockfish (Sebastiscus marmoratus). White spotted conger were released in Maizuru Bay (Kyoto, japan) and tracked using acoustic telemetry; they were also observed in a tank using video recording. White spotted conger tended to remain inside shelters, but occasionally swam outside briefly at night. Attacking behavior of predators and predation avoidance behavior of red tilefish were also recorded in a tank. Red tilefish construct tube-shaped burrows into which they retreat to avoid attack. White spotted conger wandered around the tank, often invading the burrows to prey on red tilefish. Predation by white spotted conger occurred at night. Inside the burrows, red tilefish were not easily caught and were able to escape through the other entrance of the tube-shaped burrow. Marbled rockfish, on the other hand, pounced on red tilefish immediately after prey recognition, ambushing their prey near the burrow entrance. Predation by marbled rockfish was frequently observed around dusk and dawn, but some red tilefish that remained inside burrows survived. White spotted conger is nocturnal and probably an olfactory predator, whilst marbled rockfish is crepuscular and an ambush predator. For stock enhancement of red tilefish, the construction of tube-shaped burrows and their diurnal behavior around the burrows are desirable characteristics in reducing predation by both white spotted conger and marbled rockfish. (C) 2011 Elsevier B.V. All rights reserved.
  • Shukei Masuma; Takayuki Takebe; Yoshitaka Sakakura
    AQUACULTURE ELSEVIER 315 (1-2) 2 - 8 0044-8486 2011/05 
    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., has 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. (C) 2010 Elsevier B.V. All rights reserved.
  • Yutaka Haga; Toshihito Naiki; Youhei Tazaki; Takaaki Shirai; Yusuke Takaki; Yosuke Tanaka; Kazunori Kumon; Satoshi Shiozawa; Shukei Masuma; Toshihiro Nakamura; Shuzo Ishida; Toshio Takeuchi
    FISHERIES SCIENCE SPRINGER JAPAN KK 77 (2) 245 - 253 0919-9268 2011/03 
    Two feeding experiments were conducted to determine the effect of a 5'-inosine monophosphate (IMP)-supplemented casein peptide-based microdiet (MD) on the feeding activity, growth and survival of Pacific bluefin tuna (PBT) larvae. PBT larvae [total length: 14.0 mm (Exp. 1) or 13.3 mm (Exp. 2)] were fed a casein peptide-based MD supplemented with or without 3% IMP for 12 days. As a negative control, a limited number of yolk-sac larvae of spangled emperor Lethrinus nebulosus were fed only for the first 7 days and starved for the next 5 days. A sufficient amount of yolk-sac larvae of spangled emperor was fed in the Exp. 2. All fish in the control group had died by 9 or 10 days after the experiment. Extensive mortality was observed in fish fed the MD. The MD was only found in the stomach contents of PBT fed the MD + IMP. Of the fish fed an IMP-supplemented diet, 50% survived for 12 days after the initiation of both feeding experiments. In addition, significantly higher growth than that observed during the first 7 days was seen in the PBT in the IMP treatment after 12 days of the feeding experiment. These results suggest that the supplementation of casein peptide-based MD with IMP could improve the feeding activity, survival and growth performance of PBT.
  • MASUMA SHUKEI
    NSUGAF The Japanese Society of Fisheries Science 76 (5) 972 - 972 0021-5392 2010/09
  • Toyohiro Nishioka; Koh-ichiro Mori; Takuma Sugaya; Nobuhiro Tezuka; Takayuki Takebe; Hitoshi Imaizumi; Kazunori Kumon; Shukei Masuma; Toshihiro Nakai
    FISH PATHOLOGY JAPAN SOC FISH PATHOL DEPT FISHERIES-FAC AGR 45 (2) 69 - 72 0388-788X 2010/06 
    Amami Station of Fisheries Research Agency, Japan has experienced mass mortalities of Pacific bluefin tuna Thunnus olientalis in the process of seed production since around 2000. The mortalities mostly occurred at larval stages. In some cases of the mortalities, but not all cases, the diseased fish was characterized by vacuolation in the central nervous systems and retina, and a betanodavirus (RGNNV genotype) was detected in the affected fish by PCR and FAT methods and culture isolation. The present results suggest that VNN can be a cause of larval mortality of Pacific bluefin tuna.
  • Francisco de la Serna Sabate; Yoshitaka Sakakura; Yousuke Tanaka; Kazunori Kumon; Hideki Nikaido; Takeshi Eba; Akefumi Nishi; Satoshi Shiozawa; Atsushi Hagiwara; Shukei Masuma
    AQUACULTURE ELSEVIER SCIENCE BV 301 (1-4) 16 - 21 0044-8486 2010/03 [Refereed]
     
    Behavioral development was observed in the early life stages of Pacific bluefin tuna in order to provide fundamental information for improving seedling production techniques. Behavioral observations to quantify swimming, schooling and cannibalistic behavior were made at different developmental stages: pre-flexion (5 days after hatching, DAH), flexion (12 DAH), post-flexion (14 DAN) and juvenile (20 DAH). Video recordings of either observation containers or the rearing tank were made to observe swimming and schooling behavior, respectively. Cannibalistic behavior was estimated by frequency of chase behavior. Swimming speed maintained constant values from 6 DAH (9.2 +/- 6.0 mm/s, pre-flexion stage) to 20 DAN (22.4 +/- 9.0 mm/s, beginning of juvenile stage) and increased rapidly thereafter to 29 DAN (85.2 +/- 32.5 mm/s). Schooling behavior was first observed on 25 DAH juveniles (SL 23.5 +/- 5.0 mm). Chase behavior was first observed at 14 DAH (standard length, SL 6.1 +/- 0.6 mm, transition at flexion to post-flexion stage) and increased thereafter. We propose that a practical developmental stage for size grading to reduce the mortality by cannibalism should be between post-flexion and early juvenile (SL 6-23 mm), when the cannibalistic behavior onsets and swimming speed are relatively low. (C) 2010 Elsevier B.V. All rights reserved.
  • HAGA Yutaka; NAIKI Toshihito; TAZAKI Youhei; TAKEBE Takayuki; KUMON Kazunori; TANAKA Yosuke; SHIOZAWA Satoshi; NAKAMURA Toshihiro; ISHIDA Shuzo; IDE Kentaro; MASUMA Shukei; TAKEUCHI Toshio
    水産増殖 58 (4) 0371-4217 2010
  • SABATE Francisco De La Serna; SAKAKURA Yoshitaka; TAKEBE Takayuki; NIKAIDO Hideki; MATSUMOTO Naoyuki; SHIOZAWA Satoshi; HAGIWARA Atsushi; MASUMA Shukei
    水産増殖 水産増殖談話会 57 (2) 329 - 335 0371-4217 2009 [Refereed]
     
    クロマグロの行動観察のための至適条件を検討し、攻撃行動に着目した行動の発達を調べた。異なる水槽の色および照度に仔魚を置いたところ、暗い色の水槽と高照度（900 lx以上）では生残が低く（0-10％）、透明な水槽と中程度の照度（600 lx）で生残が高かった（60-80％）。後者の条件で、異なる孵化日と発育段階の魚；すなわち開口、脊索屈曲前期、脊索屈曲期、脊索屈曲後期、稚魚、を用いて遊泳および攻撃行動の発達を観察した。また、36日齢の稚魚で、給餌と攻撃行動の関係を調べた。開口は2日齢（体長2.9±0.1mm）で、稚魚は19日齢（体長6.3mm）に初めて出現した。遊泳速度は脊索屈曲期までは変化しなかった（3.7±3.9-9.5±14.3mm／s）。攻撃行動は16日齢（体長5.4±0.9mm、脊索屈曲後期）より観察され、その頻度は稚魚期にも変化しなかった。攻撃行動は稚魚が空腹状態のときに観察された。
  • Yoshiki Kato; Takayuki Takebe; Shukei Masuma; Takashi Kitagawa; Shingo Kimura
    FISHERIES SCIENCE BLACKWELL PUBLISHING 74 (1) 48 - 53 0919-9268 2008/02 [Refereed]
     
    Physical conditions such as oceanic turbulence related to food availability are considered to be important factors affecting fish larval survival. Rearing experiments were conducted to elucidate the effects of turbulence on the survival and feeding rates during the initial feeding period of Pacific bluefin tuna Thunnus orientalis. Six levels of turbulence intensity were provided by changing flow rates from pipes set on the bottom of rearing tanks. The result showed a dome-shaped relationship between turbulence level and survival rate, in which the feeding rate appeared higher at a logged turbulence energy dissipation rate of -6.32, and decreased at both higher and lower turbulence levels. Compared with the turbulence intensity in the ocean, the optimal turbulence level for Pacific bluefin tuna larvae corresponded to the turbulence caused by sea surface winds with speeds of 4-12.5 m/s. The estimated optimal turbulence intensity for Pacific bluefin tuna larvae is comparable to that for yellowfin tuna Thunnus albacares.
  • TERUYA Kazuhisa; TERUYA Kazuhisa; MASUMA Shukei; HONDO Yasushi; HAMASAKI Katsuyuki
    水産増殖 56 (3) 0371-4217 2008
  • Shukei Masuma; Shigeru Miyashita; Hiroshi Yamamoto; Hidemi Kumai
    REVIEWS IN FISHERIES SCIENCE TAYLOR & FRANCIS INC 16 (1-3) 385 - 390 1064-1262 2008 [Refereed]
     
    Development of bluefin tuna farming in Japan has a 30-year history. This paper reviews recent developments as well as the current status and problems of farming, broodstock management, and fingerling production in Japan. Farmed bluefin tuna by wild seed-stock comprises approximately 15-20% (2,400 tons) of the annual catch of bluefin in Japan. Comparisons among farms in Japan indicate that bluefin tuna growth is positively correlated with annual water temperature. Broodstock commence spawning at approximately 3-5 years of age, and eggs are collected from within the cages. The number of bluefin tuna eggs collected in Japan has varied greatly - between zero and about 500 million - with variance between farms and years. Current larval rearing techniques produce tens of thousands of fingerlings of 35-50 mm per season in Japan, but survival rates are 0.01-4.5%. Although there are the bottlenecks in egg collection and larval rearing under the present technology, the approaches for enhancing bluefin resources and the replacement of wild seed-stock by artificial fingerling to tuna farms have firmly been improving in Japan.
  • Shukei Masuma; Nobuhiro Tezuka; Kazuhisa Teruya
    Japanese Journal of Ichthyology 40 (3) 333 - 342 1993/09 [Refereed]

Books etc

  • 升間主計 (Joint work第7章 養殖の歴史と現状、第8章 養殖・種苗生産の技術)朝倉書店 2022/06 9784254485066 x, 196p, 図版 [4] p 121-192
  • 近畿大学水産研究所 (Supervisor)日刊工業新聞社 2019/02 9784526079443 159p
  • 水産総合研究センター (Joint work)成山堂書店 2014/03 9784425886319 xii, 294p, 図版 [8] p
  • Aquaculture Industry of Bluefin Tuna － Development of Technology and Business
    升間主計 (Joint workMaturation and egg spawning)恒星社厚生閣 2011/03 9784769912439 145p, 図版 [2] p

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