NIPPON SUISAN GAKKAISHI
Online ISSN : 1349-998X
Print ISSN : 0021-5392
ISSN-L : 0021-5392
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Volume 79, Issue 6
Displaying 1-36 of 36 articles from this issue
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  • Laboratory study on the behavioral patterns of Japanese common squid Todarodes pacificus under light and dark conditions
    GO TAKAYAMA, SEIZO HASEGAWA, YASUNORI SAKURAI, HIROSHI INADA, TAKAFUMI ...
    2013 Volume 79 Issue 6 Pages 960-967
    Published: 2013
    Released on J-STAGE: November 18, 2013
    DOIhttps://doi.org/10.2331/suisan.79.960
    JOURNAL FREE ACCESS
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      The behavior of Japanese common squid Todarodes pacificus in the laboratory tank was observed with an acoustic camera (DIDSON) under light and dark conditions to understand their behavioral response to light. To examine the effect of switching the light on and off, observations were conducted under four different lighting patterns consisting of combinations of light and dark conditions. The acoustic images of squid are useful for identifying their moving patterns with position and direction. Under the light condition, the squid tended to swim in the tank, away from the bottom and the walls. While in the dark condition, the squid rested mostly on the bottom, occasionally bumped their fins and arms against the walls with dashing movements, due to loss of visual perception. These behavioral patterns of squid under the light and dark conditions changed immediately upon switching the lighting condition, and were scarcely affected by the previous lighting condition.
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  • Age, growth and reproduction of the banded houndshark Triakis scyllium around the tip of the Izu Peninsula, Japan
    YUUKI FUJINAMI, SHO TANAKA
    2013 Volume 79 Issue 6 Pages 968-976
    Published: 2013
    Released on J-STAGE: November 18, 2013
    DOIhttps://doi.org/10.2331/suisan.79.968
    JOURNAL FREE ACCESS
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      We examined the biological characteristics, such as age, growth and reproduction, of the banded houndshark Triakis scyllium, which was caught around the tip of the Izu Peninsula between 1991 and 2012. Age and growth were estimated by counting growth bands in the vertebral sections from 52 males and 58 females. The number of growth bands observed for males and females was 3-15 and 2-18, respectively. One growth band formed from December to May. A growth curve was fitted to the observed length using the following modified von Bertalanffy growth equations with fixed length at birth: Lt=1329−1079exp(−0.178 t) for males, Lt=1436−1186exp (−0.165 t) for females. The growth curve was significantly different between sexes. Longevity was estimated to be 18.4 years for males and 20.6 years for females. Size and age at 50% maturity were estimated to be 914 mm total length (TL) and 5.7 years old for males, and 1083 mm TL and 8.6 years old for females. The number of embryos per litter was 8-29, and the sex ratio of embryos was 1:1.
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  • Settlement period and growth of juvenile Fulvia mutica in Tokyo Bay
    SATOSHI OHATA, MITSUHIRO ISHII, MAKOTO KAJIYAMA
    2013 Volume 79 Issue 6 Pages 977-986
    Published: 2013
    Released on J-STAGE: November 18, 2013
    DOIhttps://doi.org/10.2331/suisan.79.977
    JOURNAL FREE ACCESS
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      To examine the settlement period of juvenile Fulvia mutica and their growth, monthly dredge sampling was conducted at 24 sampling sites in Tokyo Bay from 2006 to 2010. According to shell length frequency analysis, the sampling sites were divided into two areas: northern and southern sea areas. In the northern sea area, many of the juveniles that had settled in autumn appeared from early winter, and disappeared the next summer probably due to the hypoxic water. On the other hand, in the southern sea area, while many of the juveniles that had settled in spring were caught even in summer, their growth was not observed until early autumn. A possible cause of the growth stagnation is hypoxic water, which develops during the summer. The growth of juveniles started in early winter in both sea areas, and the time taken to grow from 20 mm to 60 mm in shell length was shorter in the northern sea area than in the southern sea area.
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  • Benthic shrimp assemblages associated with water masses in the East China Sea and the Yellow Sea
    KEISUKE YAMAMOTO, KAZUYA NAGASAWA
    2013 Volume 79 Issue 6 Pages 987-1001
    Published: 2013
    Released on J-STAGE: November 18, 2013
    DOIhttps://doi.org/10.2331/suisan.79.987
    JOURNAL FREE ACCESS
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      Trawl surveys were conducted to identify the structure and distribution of the benthic shrimp assemblages related to water masses in the East China Sea and the Yellow Sea in summer (mid-August to mid-October 1989) and winter (January to February 1991). Using cluster analysis, five spatially distinct clusters were identified in the species composition and abiotic data in these seas. Canonical correspondence analysis also suggested a significant relationship between benthic shrimp species and abiotic factors. The benthic shrimp assemblages in this region consisted of the following five assemblage groups: a group in the Yellow Sea cold-water mass; a group originating from the Kuroshio; a group on the continental shelf edge in the Kuroshio water mass; a group in the low-salinity water mass; and a group in the mixed water mass. Water masses appear to be major factors regulating the distribution of the benthic shrimp assemblages in the East China Sea and the Yellow Sea.
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  • Evaluation of riverine DIN in the nori Pyropia cultivated in coastal sea areas using nitrogen stable isotopes
    SHUZO TAKAGI, YASUKO SHIMIZU, KOJI KUSAKA, SHIHO KOBAYASHI, TATEKI FUJ ...
    2013 Volume 79 Issue 6 Pages 1002-1008
    Published: 2013
    Released on J-STAGE: November 18, 2013
    DOIhttps://doi.org/10.2331/suisan.79.1002
    JOURNAL FREE ACCESS
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      To clarify the influence of nutrient supply from rivers on nori (Pyropia), we investigated the distributions and variance of nitrogen stable isotope (δ15N) in nori thalli in the Bisan Strait in the eastern part of the Seto Inland Sea. The δ15N value of nori cultured in low salinity areas was 7.7±0.1‰. On the other hand, the δ15N value of discolored nori collected in high salinity areas was 11.1±0.1‰. Using these results, the contribution ratios of riverine nitrogen to nori were estimated. The δ15N value in nori transplanted to an estuarine zone far from the river mouth decreased to the same level as the nori originally growing until 7 days. δ15N reflected the influence of nitrogen supply from rivers more quickly than the change of color.
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  • Comparison of discoloration of dark muscle between cultured yellowtail Seriola quinqueradiata and amberjack Seriola dumerili during chilled storage
    KATSUJI MORIOKA, KENJI OHNISHI, YOSHIAKI ITOH
    2013 Volume 79 Issue 6 Pages 1009-1016
    Published: 2013
    Released on J-STAGE: November 18, 2013
    DOIhttps://doi.org/10.2331/suisan.79.1009
    JOURNAL FREE ACCESS
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      This study was conducted to clarify the difference in discoloration profile of the dark muscle of cultured yellowtail Seriola quinqueradiata and amberjack Seriola dumerili during chilled storage. Discoloration of dark muscle was observed in yellowtail after storage for 24 h at 5℃, whereas no discoloration was observed in amberjack. The ratio of metmyoglobin (metMb) to total myoglobin (Mb) gradually increased in the dark muscle of both fish during storage, although it was higher in yellowtail than in amberjack. The pH of yellowtail dark muscle (pH 6.6) was lower than that of amberjack (pH 6.9). Similarly, the pH of yellowtail ordinary muscle (pH 6.0) was lower than that of amberjack (pH 6.1). Discoloration of the dark muscle of yellowtail initially appeared near the boundary between dark muscle and ordinary muscle. In crude Mb solutions prepared from the dark muscle of yellowtail and amberjack, the ratio of metMb to total Mb gradually increased during incubation at 25℃, and in both fish, this increase was accelerated by a decrease in pH from 7.0 to 6.0. These results indicate that a difference in the pH values of the dark and ordinary muscles of yellowtail and amberjack affects the difference in discoloration profile of dark muscle between these fish during chilled storage.
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