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  • 1
    Digitale Medien
    Digitale Medien
    Shark attraction using a video-acoustic system (1969)
    Springer
    Marine biology 2 (1969), S. 264-276 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract An underwater television system located off Bimini, Bahamas, was used to observe and record the attraction of free-ranging sharks to a nearby sound source. Several species of sharks were attracted by irregularly pulsed signals either containing harmonics (e.g., overdriven sine waves) or consisting of octave bands of noise. Irregularly pulsed, pure tones and harmonic sounds above 1000 Hz were apparently not attractive. Attraction was not reinforced, and habituation of the approach response was regularly observed in prolonged test series. As the number of sharks in the test area increased, swimming activity rose dramatically. Circling and crisscrossing of the site became more intense under conditions of low ambient light and turbidity. Additional tests showed that minimum attractive sound levels were remarkably low, and that sharks could locate a sound source within seconds from distances beyond our limit of visibility (about 25 m).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351149
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A new fat body associated with the gonad of surgeonfishes (Acanthuridae: Teleostei) (1985)
    Springer
    Marine biology 86 (1985), S. 109-112 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Adults of nine species of surgeonfishes (Acanthuridae) from the Red Sea, Israel and the Eastern Tropical Pacific off Mexico possess previously undescribed fat bodies associated with both male and female gonads. These structures are unique in that they are external to the abdominal cavity, are composed almost entirely of highly-saturated triacylglycerols, and appear to have close circulatory connection with the gonads. In all species except one, the fat bodies rest in triangular pockets between the trunk musculature and skin, which extend posteriorly just above the anal fin base. The composition, arrangement and dynamics of the fat bodies suggest that they support the active gonad during a spawning season that lasts, in one species, from May to September.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00399015
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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