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  • 1985-1989  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Evidence for multiple spawning in the tropical oceanic squid Stenoteuthis oualaniensis (Teuthoidea: Ommastrephidae) (1989)
    Springer
    Marine biology 101 (1989), S. 513-519 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Indirect evidence suggests that Stenoteuthis oualaniensis is a multiple spawner, a reproductive strategy not reported previously for squid. After spawning once, S. oualaniensis apparently continues to feed, grow, and mature additional oocytes before spawning again. Squid were caught by jigging at night in waters around the main Hawaiian Islands during four cruises from 1981 to 1987. All females from 200 mm mantle length (ML) to at least 318 mm ML were sexually mature, indicating that considerable growth takes place after reaching sexual maturity. Size-frequency analyses of ovarian oocytes revealed continuous egg production throughout adult life. Mature ova are stored in the oviducts, but oviduct fullness is unrelated to body size, indicating repeat spawning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541653
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Respiration and nitrogen excretion by the squid Loligo forbesi (1989)
    Springer
    Marine biology 103 (1989), S. 333-338 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Respiration and nitrogen excretion rates of mature adult Loligo forbesi were investigated at the Roscoff Laboratory (North Brittany, France) during individual short-term incubation experiments in January 1986. The squids were in post-digestive condition and not actively swimming. Both oxygen uptake and nitrogen excretion are continuous processes. The metabolic rates of this active nektonic species (145 ml kg-1 h-1 oxygen uptake, 18.56 μg g-1 h-1 ammonia excretion) are distinctly higher than those of benthic cephalopods. Proteins constitute the main metabolic substrate for energetic needs. Besides ammonia, urea is also continuously released, in amounts ranging from 5 to 16% of ammonia-excretion values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397267
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Ammonia excretion during feeding and starvation in Octopus vulgaris (1985)
    Springer
    Marine biology 86 (1985), S. 193-197 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ammonia excretion was investigated in relation to oxygen consumption during a feeding regime and during shortterm starvation in two mature male Octopus vulgaris, trawled in spring 1983 off Banyuls-sur-mer. In our study, ammonia excretion is taken to include renal and gill loss. The excretion of primary amines was also studied, but proved to be negligible under our experimental conditions. Ammonia excretion and oxygen consumption are repetitive linear processes over 1 to 2 h incubation periods at 15° to 16°C, in both fed and starved conditions. Starvation induces a decline in ammonia excretion and oxygen consumption and an increase in the atomic O:N ratio, suggesting that O. vulgaris uses up other reserves (lipids) before utilizing an exclusively protein substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399026
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    Paper (German National Licenses)
    Fulltext
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