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Record of trapping experiment (with description of Nautilus and octopod jaws preserved as stomach contents in a cat shark)

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Kazushige Tanabe at The University of Tokyo
Kazushige Tanabe
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Abstract

Record of trapping experiments of Nautilus pompilius in the water off Suva and off Ovalau Island, Fiji in 1986 is described with description of measurement data of captured nautilus specimens and nautilus and octopod jaws preserved as stomach content of a captured cat shark.
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Kagoshima University, Research Center
for the South Pacific, Occasional Papers,
No. 15, p.5-15

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Tanabe 1988 (Kagoshima Univ. Res. Ceter for S. Pacifi
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Early life history and habitat of Nautilus pompilius inferred from oxygen isotope examinations
Article
Full-text available
  • Jan 1992
Ontogenetic change of habitat depths of Nautilus pompilius in the Philippines (Taon Strait) and Fiji is considered by comparing 18O/16O ratios in septa and cameral fluid of live-caught specimens and ambient sea-water. 18O values of cameral liquid become heavier with decreasing volume within a chamber, which may be due to isotopic fractionation during discharge across the siphuncular wall. All of the seven Philippine and Fiji specimens analyzed show a distinct change in 18O from light values in the first seven septa to heavier values in the succeeding septa. Two different isotopic temperature scales are obtained for the Fiji and Philippine populations, suggesting a differential vital effect of metabolism between them. Sightly light 18O values in Septa 1 to 7 and hatching at relatively high temperatures in aquaria both suggest that N. pompilius hatch at the shallowest depths within their inhabitable vertical range. Depths of postembryonic animals in the Philippines and Fiji waters estimated from the isotopic temperature-depth diagrams range from 120 to 160 m and from 440 to 520 m, respectively, both of which correlate well with capture records. More than several tens of small-scale 18O cycles are detected in the sequence of nacreous layers within the single septum of a submature Philippine specimen. This can be interpreted as reflecting daily vertical migration.
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Notes on animal weight, cameral fluids, swimming speed, and color polymorphism of the cephalopod Nautilus pompilius in the Fiji Islands
Article
Full-text available
  • Jan 1977
Forty-six specimens of Narrtilus pon~pilius Linnaeus were captured in depths varying between 100 and 500 m outside of the fringing reef near Suva, Fiji Islands. Thirty- right of the specinlens were male. Air weight per individual varied between 347 and 630 g. Sexual dimorphism in size is indicated, since mature shell modifications (approximated septa, blackened aperture) were present in two females weighing about 350 g (soft parts plus shell) and one weighing slightly over 400 g; the sniallest niale showing mature shell mod- ifications weighed 496 g. All newly captured speciniens were heavier than seawater, with mean weight in seawater of 1.87 g determined for twenty-five speciniens. Total volumes of cameral liquid ranged between 13.5 and 0 ml. Thirteen of twenty-five sampled specimens showed less than 1.0 m1 of cameral liquid from all chanibers. Average cameral liquid os- niolarity was lower than that observed in sampled populations of N. mac~omphalris from New Caledonia and N. pompilius from the Philippine Islands. SIaximum swimming rates were 0.25 n~/sec. N. po~npilius exhibits two conlnion color polyrnorphs.
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The reproductive biology of Nautilus pompilius in the Philippines
  • Jan 1977
  • 177-184
HAVEN, N., 1977 : The reproductive biology of Nautilus pompilius in the Philippines. Mar. Biol., 42, 177-184.
Marine ecological study on the habitat of Nautilus in the environs of Viti Levu Island
  • Jan 1982
  • 69-73
HAYASAKA, S. and SHINOMIYA, A., 1982: Marine ecological study on the habitat of Nautilus in the environs of Viti Levu Island, Fiji. Sci. Res. Rep. Oceania, (NAV '81) Kagoshima Univ. Res. Center S. Pac. I, 69-73
Cephalopod Life Cycle
  • Jan 1983
  • 11-28
WARD, P., 1983: Nautilus macromphalus (In BOYLE, P., ed.). Cephalopod Life Cycle, Vol. 1, 11-28. Academic Press.