NIPPON SUISAN GAKKAISHI
Online ISSN : 1349-998X
Print ISSN : 0021-5392
ISSN-L : 0021-5392
Volume 79, Issue 1
Displaying 1-50 of 55 articles from this issue
Foreword
Originals
  • TAKAHISA YOSHIDA, KEIICHI UCHIDA, YOSHINORI MIYAMOTO, TAKASHI NANBA, T ...
    2013 Volume 79 Issue 1 Pages 2-9
    Published: 2013
    Released on J-STAGE: January 24, 2013
    JOURNAL FREE ACCESS
      To study conger eel tube fishery in Tokyo Bay, we developed equipment to measure the time at which conger eel first entered the tubes and, after testing the equipment in the laboratory, conducted field experiments around Naka-no-Se, Tokyo Bay. A total of 192 experimental tubes were deployed and 85 of them were successfully measured. Conger eels are generally known to be active at night; however, in this study, even though the tubes were deployed during the daytime, 35% of the first entry times were within one hour after deployment and 63% of them were before sunset.
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  • KOUDAI IWAKAWA, TOYOMI TAKAHASHI, TETSUYA TAKATSU, YUTA INAGAKI, TOSHI ...
    2013 Volume 79 Issue 1 Pages 10-19
    Published: 2013
    Released on J-STAGE: January 24, 2013
    JOURNAL FREE ACCESS
      The growth trajectories of flathead flounder Hippoglossoides dubius of the 1989, 1991, and 1995 dominant year-classes in Funka Bay, Hokkaido, Japan were investigated using otter trawl samples collected from 1990 to 2006. The von Bertalanffy growth model and linear equations showed good fit for the year-classes for both sexes. The observed linear increase in body length at ≥3 years old may be sustained by the dietary shift from ophiuroids and small crustaceans with low energy content to fish and decapods with high energy content. The total lengths estimated by back-calculation from the otolith increment radii obtained from older individuals were smaller than those estimated from age-length data at catch. This discrepancy is likely due to a seasonal difference in growth between body length and otoliths in H. dubius in Funka Bay, and/or to the high fishing intensity by bottom gill nets and the fact that fast-growing individuals tend to be caught at an earlier age.
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  • TOSHIHIRO TANAKA, SATOSHI YOSHIMITSU, YUJI IMAYOSHI, YOSHIE ISHIGA, RY ...
    2013 Volume 79 Issue 1 Pages 20-30
    Published: 2013
    Released on J-STAGE: January 24, 2013
    JOURNAL FREE ACCESS
      Distributions of seaweed/seagrass communities were determined from 230 sites along the coast of Kagoshima Bay, southern Japan, during a series of surveys in 2006. Sargassum (brown algae) and Zostera (angiosperm) communities were confirmed from 159 and 41 sites, respectively. Of the 19 species of Sargassum and Zostera confirmed in this study, distributional characteristics of 12 major species were also elucidated. Kagoshima Bay is comprised of three different areas (back, central part and mouth of the bay) as defined by the influence of waters entering the bay from the Kuroshio Current. Two Zostera species, Z. marina and Z. japonica, and four temperate species of Sargassum, S. fusiforme, S. hemiphyllum, S. patens, and S. piluliferum, were confirmed from all areas. Meanwhile, six subtropical and warm-temperate species, S. alternato-pinnatum, S. crispifolium, S. cristaefolium, S. duplicatum, S. glaucescens, and S. incanum, were not detected in Kagoshima Bay except for some sites, as indicated by a previous survey in 1976; however, we detected them from various sites in the central part and mouth of the bay. We suggest that these species appeared and developed communities in the past 30 years.
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  • YASUHIRO FUJIOKA, TAKASHI TAGUCHI, TAKESHI KIKKO
    2013 Volume 79 Issue 1 Pages 31-37
    Published: 2013
    Released on J-STAGE: January 24, 2013
    JOURNAL FREE ACCESS
      The small cyprinid honmoroko Gnathopogon caerulescens is an endemic species of Lake Biwa, Japan, and a commercial resource for fisheries and aquaculture. In a laboratory setting, using eggs collected in the field, we investigated the relationship between the date of hatching of five successive cohorts of this fish and certain spawning parameters of each cohort at adulthood. Depending on the cohort, adult females spawned on average 3,000-4,000 eggs apiece in 1.5-3.5 mean spawning events between early April (water temperature 10.5℃) and mid-July (25.9℃). Spawning occurred at intervals of 3 to 9 days in May and June in one cohort, but irregularly in the other cohorts. More than 80% of the eggs released were spawned early in the breeding season (at<20℃ water temperature) in the three earlier-hatched cohorts, but the two later-hatched cohorts spawned less than 70% of the eggs during the same period. These data show that G. caerulescens is a multiple spawner with spawning occurring intermittently several times during the spawning season; they also suggest that the date of hatching affects the spawning pattern at maturity.
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  • YURI TAKEUCHI, HIDEHITO TAKAHASHI
    2013 Volume 79 Issue 1 Pages 38-47
    Published: 2013
    Released on J-STAGE: January 24, 2013
    JOURNAL FREE ACCESS
      Grass prawn tissue is softened by retort sterilization. It was speculated that the cause of the softening was gelatinization of the collagen by the drip which flowed out of the shrimp during retort sterilization. By the pre-treatment of boiling in NaCl solution before retort sterilization, the moisture content in the shrimp decreased and the drip in the pouch decreased during retort sterilization. Moreover, setting up a headspace in the pouch prevented contact between shrimp muscles and the drip. The results showed that the texture was improved when gelatinization was suppressed.
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  • MASANAO NARITA, TAKASHI MAOKA, KOHJI EBITANI, HOYOKU NISHINO
    2013 Volume 79 Issue 1 Pages 48-54
    Published: 2013
    Released on J-STAGE: January 24, 2013
    JOURNAL FREE ACCESS
      Ordinary, adductor muscle of scallop is white or light yellow, but orange adductor muscle, which is a color variant, rarely occurs. This paper describes the chemical components of orange adductor muscle and the anti-oxidative activity of the pigment contained in orange adductor muscle in the Okhotsk Sea. With regard to chemical components, moisture, crude protein, crude ash, glycogen and free amino acid, there were no significant differences between orange adductor muscle and ordinary adductor muscle. The main pigment of orange adductor muscle was identified by UV-visible, MS, 1H and 13CNMR spectral data as pectenolone, which is a carotenoid widely distributed in marine shellfish. Pectenolone showed anti-oxidative activity. This activity was slightly weaker than that of astaxanthin but stronger than that of β-carotene. Thus, we concluded that pectenolone contained in orange adductor muscle is an effective pigment of carotenoid.
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Short Papers
Symposia
From birth to dinner table on walleye pollock: Social-ecological analyses and managements
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Stock enhancement and management for coastal fishery resources, using monitoring method on molecular tools
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Damages to fisheries by the Great East Japan Earthquake and tsunami disasters
News
Highlights in Fisheries Science Research
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