Relationship between frequency of upside-down posture and space size around upside-down catfish, Synodontis nigriventris.
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چکیده
منابع مشابه
Swimming in the upside down catfish Synodontis nigriventris: it matters which way is up.
Synodontis nigriventris is a surface-feeding facultative air-breather that swims inverted with its zoological ventral side towards the water surface. Their near-surface drag is about double the deeply submerged drag (due to wave drag) and roughly twice the sum of frictional and pressure drags. For streamlined technical bodies, values of wave drag augmentation near the surface may be five times ...
متن کاملUpside-down swimming catfish and utricle
s The upside-down swimming catfish (Synodontis nigriventris) has unique behavior, i.e., it frequently shows a stable upside-down posture during swimming and resting. To examine whether the unique postural control in S. nigriventris results from the characteristics of the vestibular organ, we observed the morphological aspects of the otolith and the orientation of sensory hair cells in the utric...
متن کاملThe dietary habits of the upside-down catfish, Synodontis membranaceus (Osteichthyes: Mochokidae) in Jebba Lake, Nigeria.
Dietary habits of the up side-down Mochokid catfish, Synodontis membranaceus were investigated for 24 months (April 2002-March 2004, in Jebba lake, Nigeria) using frequency of occurrence, numerical, gravimetric and index of relative importance (R1) methods. The fish is euryphagus and feeds more at night. RI values indicate that 10 of the 16 food items were major diet components. The main five f...
متن کاملRamanujan Series Upside-down
We prove that there is a correspondence between Ramanujan-type formulas for 1/π and formulas for Dirichlet L-values. Our method also allows us to reduce certain values of the Epstein zeta function to rapidly converging hypergeometric functions. The Epstein zeta functions were previously studied by Glasser and Zucker.
متن کاملUpside-down deduction
Over the recent years, several proposals were made to enhance database systems with automated reasoning. In this article we analyze two such enhancements based on meta-interpretation. We consider on the one hand the theorem prover Satchmo, on the other hand the Alexander and Magic Set methods. Although they achieve different goals and are based on distinct reasoning paradigms, Satchmo and the A...
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ژورنال
عنوان ژورنال: Biological Sciences in Space
سال: 1996
ISSN: 0914-9201,1349-967X
DOI: 10.2187/bss.10.247