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  • 1
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    Development of female reproductive organs during sexual maturation in the Japanese common squid Todarodes pacificus (1991)
    Gakkai
    In:  Nippon Suisan Gakkaishi, 57 (12). pp. 2243-2247.
    Details
    Publication Date: 2019-02-15
    Description: Development of female reproductive organs during sexual maturation was studied for Japanese common squid caught from feeding and spawning grounds. The female maturity was divided into six stages based on the histological observation of ovary. The maturity was compared with the ovary somatic index (OSI: ovary weight as a percentage of body weight), oviduct somatic index (ODSI: oviduct weight as a percentage of body weight), gonad somatic index (ovary and oviduct weight as a percentage of body weight) and nidamental gland index (m: a ratio of nidamental gland length to mantle length). Results showed that the female maturational process consists of two phases and ovary and oviducts development are correlative with the nidamental gland development. In the first phase, ripe eggs are produced in the ovary with the rapid development of the nidamental gland and in the next phase, ripe eggs are transferred into the oviducts and stored there until spawning. The nidamental gland development is slower in the next phase, wich suggests that the production of jelly material is started in this organ. It is possible to express the female maturity condition by GSI and m. These numerical values are GSI〉1.0 and m〉0.208 in yolk formation stage; GSI〉2.6and m〉0.290 in the mature stage.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Development of male reproductive organs during sexual maturation in the Japanese common squid Todarodes pacificus (1991)
    Gakkai
    In:  Nippon Suisan Gakkaishi, 57 (12). pp. 2237-2241.
    Details
    Publication Date: 2019-02-15
    Description: Development of male reproductive organs during sexual maturation was studied for Japanese common squid caught from feeding and spawning grounds. The male maturity was divided into five stages based on the histological observation of the testis. The maturity was compared with testis somatic index (TSI: testis weight as a percentage of body weight) and accessory gland somatic index (AGSI: accessory gland weight as a percentage of body weight). Results showed that sperm have already been produced in the testis even when the testis is a relatively small size, and that the male maturational process consists of two phases. In the first phase, sperm are produced in the testis and in the next phase sperm are transferred into the accessory gland, stored there in the form of spermatophore until copulation with the female. In the maturation stage, sperm are still produced, which means that copulating behavior is repeated by same male during this final sexual stage. It is possible to express the male maturity condition by TSI and AGSI. These numerical values are TSI〉0.5 and AGSI〉0.1 in the maturing stage; TSI〉2.0 and AGSI〉l.0 in the mature stage.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Relationship between statoliths and environmental variables in cephalopod (1996)
    World Scientific Publishing
    In:  International Journal of PIXE, 06 (01n02). pp. 339-345.
    Details
    Publication Date: 2021-05-03
    Description: The hard tissues of cephalopod, namely statoliths were analyzed with PIXE for the Japanese common squid Todarodes pacificus of the Sea of Japan origin in order to examine the relationship between the amount of trace elements in statoliths and environmental temperature of the squid habitat. Calcium, iron, zinc. copper and strontium were detected in the statoliths. Negative relationship was observed between Sr concentration in statoliths and environmental temperature. On the contrary to Sr, Fe and Zn concentration in statoliths related positively with environmental temperature. These observations revealed that the statoliths would be a useful thermometer for reconstructing the environmental temperature of cephalopod habitat as seen in the hard tissues of other marine organisms.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1142/S0129083596000351
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    PIXE analysis of trace elements in squid statoliths : comparison between Ommastrephidae and Loliginidae (1996)
    World Scientific Publishing
    In:  International Journal of PIXE, 06 (3-4). pp. 537-542.
    Details
    Publication Date: 2021-05-03
    Description: Trace elements in the squid statoliths were analyzed by PIXE for following seven species distributing at offshore and inshore waters: Family Ommastrephidae, Ommastrephes bartrami, Todarodes pacificus; family Loliginidae, Loligo bleekeri, L. duvaucelii, L. chinensis, L. edulis and Sepioteuthis lessoniana. Statoliths of all seven species contained manganese, iron, capper, zinc and relatively high amount of strontium. Statoliths Sr concentration, an possible index for thermal history of the animal’s habitat, were the highest in O. bartrami that spends their entire life time at pelagic water, and secondly highest in T. pacificus living at the pelagic as well as the coastal waters. On the other hand, statoliths Sr concentration was relatively low in the five species of Loliginidae living at coastal waters, with following order: L. edulis 〉S. lessoniana 〉L. duvaucelii 〉L. bleekeri 〉L. chinensis. These observations may indicate that quantity of the statoliths trace elements are species specific in squids, thus would be a possible “key” to reconsidering about taxonomy and distribution in squid.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1142/S0129083596000594
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    The 1988-89 eruption of Tokachidake volcano (1989)
    In:  [Talk] In: The Spring meeting of the Volcanological Society of Japan 1989, 1989, Tokyo, Japan .
    Details
    Publication Date: 2014-10-28
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 6
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    Direct measurements of western boundary currents off Brazil between 20°S and 28°S (1998)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 103 (C3). pp. 5429-5437.
    Details
    Publication Date: 2018-04-17
    Description: Current measurements from three moored arrays on the Brazilian continental slope between 20 degrees S and 28 degrees S are investigated for the existence and strength of western boundary currents from near the surface down to the North Atlantic Deep Water. The Brazil Current is found to deepen southward from 100 m to more than 670 m and to strengthen its volume transport to 16.2 x 10(6) m(3)/s. Antarctic Intermediate Water is transported in a well-developed boundary current southward at 28 degrees S and northward north of Cabo Frio (24 degrees S). This result supports earlier suggestions derived from the analysis of hydrographic data that Antarctic Intermediate Water enters the Brazil Basin from the east and bifurcates as it meets the continental break off Brazil. North Atlantic Deep Water is transported southward in a weakly developed boundary current that leads to lower estimates of volume transport than expected from earlier hydrographic data analysis.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/97JC03529
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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