NIPPON SUISAN GAKKAISHI
Online ISSN : 1349-998X
Print ISSN : 0021-5392
ISSN-L : 0021-5392
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Volume 81, Issue 3
Displaying 1-48 of 48 articles from this issue
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Foreword
Prize Winners of the Japanese Society of Fisheries Science Awards 2014
Association of Japanese Agriculture Scientific Societies Prize 2015
The Japanese Society of Fisheries Science Award 2014
Scientific Achievement Award in Fisheries Science 2014
Originals
  • Analyses of fuel consumption, catches and usability of a modified trawl net constructed of ultra-high-molecular-weight polyethylene twine for pair trawl fishery in the East China Sea
    TATSURU KADOTA, YOSHIKI MATSUSHITA, KOICHI HOSHINO, MEGUMI MINAGAWA, H ...
    2015 Volume 81 Issue 3 Pages 400-407
    Published: 2015
    Released on J-STAGE: June 05, 2015
    DOIhttps://doi.org/10.2331/suisan.81.400
    JOURNAL FREE ACCESS
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      Fishing experiments were carried out to reduce fuel consumption in pair trawl fishery in the East China Sea. A modified trawl was constructed with thinner twine of ultra-high-molecular-weight polyethylene (Dyneema) for the wings and the main body, except the belly. By using the modified trawl, fuel consumption during towing was significantly reduced compared to the conventional trawl constructed of thick polyethylene twine (p<0.05, 8.5% reduction when the codend was open, 4.4% reduction when the codend was closed). Furthermore, CPUE of the total of commercially valuable species did not significantly differ (p>0.05) between tows by the modified trawl (170.8 kg/h) and the conventional trawl (144.2 kg/h) as well as CPUEs of five commercially important species, such as yellow sea bream and Japanese butterfish (p>0.05). However, on-deck labor increased by using the modified trawl because many fishes were entangled in the meshes of the main body. Thus, we confirmed that the modified trawl reduces fuel consumption while maintaining catch, but further modification is necessary to improve on-deck handling.
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  • A comparative study of stock assessment and stock management between the Pacific stock of chub mackerel Scomber japonicus and the Northeast Atlantic mackerel Scomber scombrus
    TAIKI OGAWA, KAZUHIKO HIRAMATSU
    2015 Volume 81 Issue 3 Pages 408-417
    Published: 2015
    Released on J-STAGE: June 05, 2015
    DOIhttps://doi.org/10.2331/suisan.81.408
    JOURNAL FREE ACCESS
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      Catches of the Pacific stock of chub mackerel Scomber japonicus have been dominated by fishes of ages 0 to 2. On the other hand, catches of the Northeast Atlantic mackerel Scomber scombrus have mainly consisted of fishes aged 3 or over. In order to study the causes of the difference, we compared biological traits, stock dynamics, stock assessments, stock management and fisheries management. Natural mortality coefficient of the Pacific stock of chub mackerel (0.4/year) was higher than that of the Northeast Atlantic mackerel (0.15/year). Also, weight at age of the Pacific stock of chub mackerel was larger than that of the Northeast Atlantic mackerel. Yield per recruitment analyses indicated that the desirable age at first capture for the Pacific stock of chub mackerel was two or three years younger than that for the Northeast Atlantic mackerel. Therefore, we concluded that one of the causes of the difference of catch at age was differences of biological traits; the effects of other factors were unclear. We also point out the potential problem of recent stock management of the Northeast Atlantic mackerel.
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  • Stock assessment of sockeye salmon Oncorhynchus nerka by using adaptive framework virtual population analysis
    YU SU, EMMANUEL ANDREW SWEKE, TAKASHI DENBOH, HIROSHI UEDA, TAKASHI MA ...
    2015 Volume 81 Issue 3 Pages 418-428
    Published: 2015
    Released on J-STAGE: June 05, 2015
    DOIhttps://doi.org/10.2331/suisan.81.418
    JOURNAL FREE ACCESS
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      In Lake Toya, sockeye salmon Oncorhynchus nerka is heavily caught by recreational angling and its population has widely fluctuated from year to year. Adaptive framework virtual population analysis (ADAPT VPA) was conducted as a step towards sound management of the stock. Surveys by mail, access point, and questionnaire were carried out to collect data on fork length, wet body weight, species, and catch number of sockeye salmon from anglers. Additionally, we carried out gillnet sampling whose data included wet body weight, and fork length which was used in age length key of sockeye salmon. The catch data of sockeye salmon from Lake Toya Fisheries Cooperative Association (Lake Toya FCA) and anglers were used to calculate total catch. Catch per unit effort (CPUE) from anglers was used as an abundance index for the ADAPT VPA. The stock of sockeye salmon in the lake was estimated to be 8.31 tons in 1998, but decreased noticeably to 4.13 tons in 2002. This was followed by a considerable increase to 17.26 tons in 2009. In 2012, the estimated stock weight was 7.77 tons.
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  • Temporal changes in demersal fish assemblage structure in the East China Sea and the Yellow Sea
    KEISUKE YAMAMOTO, KAZUYA NAGASAWA
    2015 Volume 81 Issue 3 Pages 429-437
    Published: 2015
    Released on J-STAGE: June 05, 2015
    DOIhttps://doi.org/10.2331/suisan.81.429
    JOURNAL FREE ACCESS
    Supplementary material
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      Both the East China Sea and the Yellow Sea are important fishing grounds for demersal fishes. Trawl surveys were conducted during winter from 1991 to 2007 to clarify temporal changes in demersal fish assemblage structure in the Kuroshio water and Yellow-Sea cold water within these seas. In total, 163 and 56 species of demersal fishes were collected in the Kuroshio water and Yellow-Sea cold water, respectively. Densities of shallow-water fishes decreased in both waters, and there was a marked decline in the Kuroshio water from 1996 to 2007. Species richness and evenness of demersal fish assemblage also decreased in the Kuroshio water. These changes are considered to have resulted from the high fishing intensity in the coastal and offshore areas of the seas.
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  • Diet of torrent catfish Liobagrus reini and fluvial sculpin Cottus pollux in the Aki River, Tokyo Metropolis
    HIROMU OGAWA, OSAMU KATANO, MASASHI YOKOTA, CARLOS AUGUSTO STRUSSMANN
    2015 Volume 81 Issue 3 Pages 438-446
    Published: 2015
    Released on J-STAGE: June 05, 2015
    DOIhttps://doi.org/10.2331/suisan.81.438
    JOURNAL FREE ACCESS
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      We investigated the diet of two benthic species, the torrent catfish Liobagrus reini and the fluvial sculpin Cottus pollux (large-egg type), from May 2013 to January 2014 in the Aki River, Tokyo, Japan. The diet was analyzed by volume of ingested prey animals and index of relative importance (IRI). Both species mainly preyed on Ephemeroptera, Trichoptera and Diptera. The catfish preyed on ephemeropteran nymphs selectively throughout the year, whereas the sculpin did not prey on it selectively in winter. The differences between the two species might result from different foraging tactics but their diets overlapped greatly in about half of the months examined. This fact suggests the potential for competition for food resources between them when benthic invertebrates are not abundant.
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  • Spatial and temporal variation of sediment properties along the coast of the Sanriku District, Iwate Prefecture, due to the tsunami generated by the Great East Japan Earthquake in 2011
    KIMIAKI NAIKI, MIWA YAMADA, SHINNOSUKE KAGA, SHIHO WATANABE, TAKASHI K ...
    2015 Volume 81 Issue 3 Pages 447-455
    Published: 2015
    Released on J-STAGE: June 05, 2015
    DOIhttps://doi.org/10.2331/suisan.81.447
    JOURNAL FREE ACCESS
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      To determine the effects of the tsunami generated by the Great East Japan Earthquake in 2011 on the environment of aquaculture farming grounds, we investigated environmental conditions of the sediment in nine bays along the Pacific Coast of northern Japan. Comparisons were made before and after the Earthquake and tsunami for the following variables: mud content (MC), chemical oxygen demand (COD), and acid volatile sulfides (AVS). The spatial and temporal distributions of MC, COD, and AVS varied with differences in geographic characteristics of the bay. The amount of open water in the bay decreased but the breakwater in the bay increased after the tsunami. Changes in MC, COD, and AVS were supported by the results of numerical simulations, and our results indicated that all three variables are good indicators for managing the environment of aquaculture farming grounds.
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  • Method of measuring the ratio of metmyoglobin formation in fish meat
    KOTA INOHARA, YUKINO ONOUE, IKUO KIMURA
    2015 Volume 81 Issue 3 Pages 456-464
    Published: 2015
    Released on J-STAGE: June 05, 2015
    DOIhttps://doi.org/10.2331/suisan.81.456
    JOURNAL FREE ACCESS
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      The color of fish meat is a major factor that influences the purchasing decisions of consumers. In fisheries, a bright red color is a commercially important factor for raw fish meat such as ordinary muscle of tuna and dark muscle of fish for sashimi. The discoloration of meat from red to brown is induced by autoxidation of oxymyoglobin to metmyoglobin. Previously, we reported that the method of Bitou for measuring the ratio of generated metMb in myoglobin contained in ordinary muscle of tuna was not applicable for amberjack Seroiola dumerili myoglobin. Therefore, we suggested that for measuring the ratio of generated metMb, an individual method for each fish myoglobin should be developed. In this study, we prepared purified myoglobin from yellowtail Seriola quinqueradiata, spotted mackerel Scomber australasicus, chub mackerel Scomber japonicus, red seabream Chrysophrys major and southern bluefin tuna Thunnus maccoyi and then prepared deoxymyoglobin, oxymyoglobin and metmyoglobin. The wavelength of isosbestic point among visible spectra of deoxymyoglobin, oxymyoglobin and metmyoglobin and between visible spectra in the β peak of deoxymyoglobin and metmyoglobin were 523-525 nm and 547-549 nm. From these data, we developed a method for measuring the ratio of generated metmyoglobin in myoglobin for each fish.
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Short Papers
Symposium
Forefront of studies on early life history of fishes
I.
II.
III.
Mini-Symposium
Present situation and perspective of genome editing in marine products
Regional News
Highlights in Fisheries Science Research
Topics
Dynamic Women@Fisheries Science 30
Abstracts of Original Papers
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