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  • 1980-1984  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Larval development of Euphausia nana (Crustacea: Euphausiacea) (1984)
    Springer
    Marine biology 81 (1984), S. 311-322 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The larvae of Euphausia nana Brinton in Sagami Bay and Suruga Bay, Central Japan, are described and illustrated. The furcilia stage is separated into six stages on the basis of the form of the pleopods and the number of terminal telson spines. Furcilia I, no pleopod or non-setose pleopods and seven terminal telson spines. Furcilia II, nonsetose and setose pleopods and seven terminal telson spines. Furcilia III, five pairs of setose pleopods and seven terminal telson spines. Furcilia IV, five pairs of setose pleopods and five terminal telson spines. Furcilia V, five pairs of setose pleopods and three terminal telson spines. Furcilia VI, five pairs of setose pleopods and one terminal telson spine. Segmentation of the antennal endopod and mandible palp occurred at the furcilia V stage. The dominant forms of early furcilia larvae of E. nana differed during different seasons of the year. The total lengths of calyptopis III and furcilia I to VI larvae also showed seasonal changes; they were largest in May and smallest from September to December.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393226
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vertical distribution of larvae of Euphausia nana and E. similis (Crustacea: Euphausiacea) in Sagami Bay and Suruga Bay, Central Japan (1984)
    Springer
    Marine biology 81 (1984), S. 131-137 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Vertical distributions of the larval stages of Euphausia nana Brinton and E. similis G. O. Sars in Sagami Bay and Suruga Bay, Central Japan were studied. Most of the metanauplius larvae of E. nana occurred between 25 and 80 m depth, and they were found at greater depths than the eggs and calyptopis larvae. The nauplii and metanauplii of e. similis were mainly found between 50 and 100 m depth, and they also occurred deeper than the eggs and calyptopes. The larvae of the two species from calyptopis I demonstrate diurnal vertical migration. However, this phenomenon was not clear in the season (March) when a seasonal thermocline was absent. Calyptopes and fruciliae of E. similis occurred deeper and migrated over greater vertical distances than those of E. nana. The distance of migration of furcilia I larvae of E. similis was estimated to be about 200 m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393111
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    X-diseases in the chaetognathSagitta crassa (1984)
    Springer
    Helgoland marine research 37 (1984), S. 139-148 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two different, hitherto unknown, diseases occurred in two specimens ofSagitta crassa which were individually isolated and maintained in the laboratory. One specimen survived for 24 days, producing a total of 343 eggs and suddenly died without showing any prior symptoms, and upon death had a grotesque appearance. The other had ciliary sense organs the hairs of which became stuck to one another. Ciliary sense organs are important for feeding of chaetognaths; once they become abnormal, the chaetognath may die of starvation. Specimens suffering from X-diseases have not been obtained from field samples so far. Chaetognaths which remained transparent at the time of death included specimens whose ciliary sense organs were attacked by bacteria, those slightly infected by bacteria on their body surface and those with abnormally rough body surfaces. Although the reasons for the development of the abnormality of the ciliary sense organs and body surfaces as well as the mechanism of bacterial infection remain obscure, bacterial infection and abnormalities of the body surface are often observed not only in the laboratory but also in the sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01989299
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    Paper (German National Licenses)
    Fulltext
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