E. Vivekanandan

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Reared in (tubular) aquaria containing different depths of water, Ophiocephalus striatus (0.7 g, 4.5 cm body length), an obligatory air-breathing tropical fish, swam long or short distances to enable themselves to exchange atmospheric air. In each tested depth (2.5, 5.0, 15.5, 31.0 and 40.0 cm) series, one group was starved, while the other was fed ad(More)
Reared in tubular aquaria containing different depths of water (2.5, 5.0, 15.5, 31.0 and 40.0 cm), the obligatory air-breathing fish Ophiocephalus striatus (760 mg; 4.5 cm L) was forced to swim vertically a longer or shorter distance per surfacing. Interaction of temperature (17, 22, 27, 32 and 37°C) and aquarium depth reveals that surfacing frequency of(More)
Die Nahrungsausnutzung des herbivoren FischesTilapia mossambica wurde bei unterschiedlichem Futterangebot untersucht. Als Nahrung dienten die GrünalgeSpirogyra maxima, Ziegenleber und lebende Kaulquappen. Mit Algennahrung allein konnten Jungfische ihren Energiebedarf nicht decken. Wurde darüber hinaus Ziegenleber verfüttert, so erhöhte sich sowohl die(More)
Reared in cylindrical aquaria containing different depths of water (2.5 to 70 cm) the obligatory air-breathing fish Ophiocephalus striatus, belonging to different weight classes (0.1, 0.75, 10, 20 and 41 g), was forced to swim vertically a longer or shorter distance per surfacing. Surfacing frequency was a depth-dependent, activity in individuals weighing(More)
Reared in tubular aquaria containing 20, 40 and 60 cm depth 0f water, Heteropneustes fossilis (20 g; 17 cm body length), an air-breathing catfish, swam 40, 80 and 120 cm/surfacing to exchange atmospheric air. With decreasing Po2, the starving groups reduced the surfacing, whereas, the decrease in the Po2 beyond 70 mm Hg induced the feeding groups to surface(More)
The obligatory air-breathing fish Ophiocephalus striatus, fed on goat-liver, surfaced 906 times, swimming 270 m/day in aerated water (mean pO2: 151 mm Hg) and 883 times, travelling 325 m/day in non-aerated water (92 mm Hg); surfacing and swimming activities increased below the pO2 of 74 mm Hg. Hanging duration was more (8.4 hr/day) in the aerated series(More)
A total of 200 specimens of oil sardine Sardinella longiceps collected from Kochi in the southwest coast and Chennai in the southeast coast were subjected to truss analysis. A truss network was constructed by interconnecting 10 landmarks to form a total of 21 truss distance variables extracted from the landmarks. The transformed truss measurements were(More)
The response of the Arabian Sea to global warming is the disruption in the natural decadal cycle in the sea surface temperature (SST) after 1995, followed by a secular warming. The Arabian Sea is experiencing a regional climate-shift after 1995, which is accompanied by a five fold increase in the occurrence of "most intense cyclones". Signatures of this(More)