scholarly journals New insights into the enameloid microstructure of batoid fishes (Chondrichthyes)

2016 ◽  
Vol 177 (3) ◽  
pp. 621-632 ◽  
Author(s):  
Esther Manzanares ◽  
Diego Rasskin-Gutman ◽  
Héctor Botella
Keyword(s):  
Batoid Fishes

Mervyn Edward Griffiths 1914-2003. An obituary by Tom Grant

2003 ◽  
Vol 25 (1) ◽  
pp. 115 ◽  
Author(s):  
T Grant
Keyword(s):  
High School ◽  
Scientific Literature ◽  
New South ◽  
New South Wales ◽  
Master Of Science ◽  
South Wales ◽  
Colour Changes ◽  
The University ◽  
Batoid Fishes ◽  
Zoology Department

MERV GRIFFITHS was born in Sydney on 8th July 1914, grew up in Northbridge and was educated in schools in North Sydney, including North Sydney Boys’ High School, which he attended from 1930-32. He entered what he, mischievously referred to as “The University” [University of Sydney] in 1934 to study Zoology. This period was difficult financially for all, including the University of Sydney, but in spite of the effects of underfunding and crowded conditions, Merv followed his biological interests under the tutelage of Professor W. J. Dakin and a small staff in the Zoology Department. He shared the Caird Scholarship and Haswell Prize with his friend and colleague Darcy Gilmour in 1936, obtained his Bachelor Degree in Zoology with first Class Honours in 1937, followed by his Master of Science in 1938. Merv first began publishing in the scientific literature in 1936 with a paper on The colour changes in batoid fishes in the Proceedings of the Linnean Society of New South Wales.

scholarly journals The evolution of cranial design, diet, and feeding mechanisms in batoid fishes

2007 ◽  
Vol 47 (1) ◽  
pp. 70-81 ◽  
Author(s):  
M. N. Dean ◽  
J. J. Bizzarro ◽  
A. P. Summers
Keyword(s):  
Batoid Fishes

Eye retraction in the giant guitarfish, Rhynchobatus djiddensis (Elasmobranchii: Batoidea): a novel mechanism for eye protection in batoid fishes

Zoology ◽  
2016 ◽  
Vol 119 (1) ◽  
pp. 30-35 ◽  
Author(s):  
Taketeru Tomita ◽  
Kiyomi Murakumo ◽  
Kei Miyamoto ◽  
Keiichi Sato ◽  
Shin-ichiro Oka ◽  
...  
Keyword(s):  
Eye Protection ◽  
Batoid Fishes

scholarly journals Visual fields of four batoid fishes: a comparative study

2008 ◽  
Vol 211 (4) ◽  
pp. 482-490 ◽  
Author(s):  
D. M. McComb ◽  
S. M. Kajiura
Keyword(s):  
Comparative Study ◽  
Visual Fields ◽  
Batoid Fishes

Notes on batoid fishes of the Socotra Archipelago (north-western Indian Ocean), with four new records

Zootaxa ◽  
2021 ◽  
Vol 4951 (3) ◽  
pp. 511-528
Author(s):  
SERGEY V. BOGORODSKY ◽  
UWE ZAJONZ ◽  
FOUAD N. SAEED ◽  
SIMON WEIGMANN
Keyword(s):  
Indian Ocean ◽  
Coastal Waters ◽  
New Records ◽  
Western Indian Ocean ◽  
Small Scale ◽  
Main Island ◽  
Commercial Species ◽  
Socotra Archipelago ◽  
Batoid Fishes ◽  
North Western

The species composition of batoid fishes from coastal waters of the Socotra Archipelago is reviewed, with confirmed records of the wedgefish Rhynchobatus djiddensis (Forsskål, 1775) and four new records of sharkrays, wedgefishes, and guitarfishes based on collected specimens, including one species from Abd al-Kuri Island, Rhina ancylostoma Bloch & Schneider, 1801 (Rhinidae), and three species from the main island Socotra, Acroteriobatus salalah (Randall & Compagno, 1995) and Rhinobatos punctifer Compagno & Randall, 1987 (Rhinobatidae), and Rhynchobatus australiae Whitley, 1939 (Rhinidae). Among the new records for the Socotra Archipelago, R. australiae represents the first verified record for the Arabian region. In addition, records of four stingray species (Dasyatidae) are verified based on underwater observations accompanied with photographs. All recorded batoid fishes are commercial species caught in the local small-scale fishery. Information on the identification and distribution of each species is provided.  

scholarly journals A Numerical Model for the Analysis of the Locomotion of a Cownose Ray

2021 ◽  
Author(s):  
Giovanni Bianchi ◽  
Simone Cinquemani ◽  
Paolo Schito ◽  
Ferruccio Resta
Keyword(s):  
Energy Efficiency ◽  
Autonomous Underwater Vehicles ◽  
Fluid Velocity ◽  
High Energy ◽  
Momentum Conservation ◽  
Pectoral Fins ◽  
Cownose Ray ◽  
Swimming Motion ◽  
Batoid Fishes ◽  
Promising Source

Abstract Among all aquatic species, mantas and rays swim by flapping their pectoral fins; this motion is similar to other fishes in terms of efficiency, but it gives better maneuverability and agility in turning. The fin motion is featured by a traveling wave going opposite to the forward motion, producing a force thanks to momentum conservation. This article aims at understanding the swimming dynamics of rays, focusing on energy efficiency. A CFD model of the swimming motion of a cownose ray has been implemented in OpenFOAM, simulating the acceleration of the fish from still to the steady-state velocity using an overset mesh. In this analysis, the 1-DOF dynamics of forward swimming is solved together with the fluid velocity and pressure. The effect of frequency and wavelength of fin motion on thrust, power, and velocity has been investigated and an analysis of the vortices in the wake showed has been performed. The energy efficiency of a self-propelled body has been defined in a novel way and it has been calculated for different motion conditions. The results showed that batoid fishes swim with high energy efficiency and that they are a promising source of inspiration for biomimetic autonomous underwater vehicles.

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