Results 121 to 130 of about 384 (156)

Clarification on the Fecundity ofRhinoptera bonasus(Mitchill)

Southeastern Naturalist, 2015
Abstract Accurate fecundity estimates are necessary for the proper assessment of fish stocks. Despite all recent investigations of the reproductive biology of Rhinoptera bonasus (Cownose Ray) indicating a maximum fecundity of 2 embryos per brood, maximum fecundity estimates of 6 per brood persist.
Christian M. Jones, William B. Driggers
openaire   +1 more source

Prey capture behavior and kinematics of the Atlantic cownose ray, Rhinoptera bonasus

Zoology, 2006
The structurally reinforced jaws of the cownose ray, Rhinoptera bonasus testify to this species' durophagous diet of mollusks, but seem ill-suited to the behaviors necessary for excavating such prey. This study explores this discordance by investigating the prey excavation and capture kinematics of R. bonasus.
Desirée E, Sasko, Mason N, Dean, Philip J, Motta, Robert E, Hueter   +3 more
openaire   +2 more sources

Association of Cobia, Rachycentron canadum, with Cownose Ray, Rhinoptera bonasus

Estuaries, 1982
Field and laboratory observations on an association of cobia,Rachycentron canadum with cownose ray,Rhinoptera bonasus are reported. Cobia main-tained a position in close proximity to the back of the rays. The cobia would move away from the rays to take food presented.
Joseph W. Smith, John V. Merriner
openaire   +1 more source

A Massive School of Cownose Rays, Rhinoptera bonasus (Rhinopteridae), in Lower Chesapeake Bay, Virginia

Copeia, 1989
exaly   +2 more sources

Reproductive variations in cownose rays (Rhinoptera bonasus) from Chesapeake Bay

Environmental Biology of Fishes, 2014
The cownose ray, Rhinoptera bonasus, a K-selected species in Chesapeake Bay is subject to an unregulated fishery with no management plan in place. Understanding the reproductive potential for cownose ray is important for successful conservation and management.
Robert A. Fisher, Garrett C. Call, Jan R. McDowell   +2 more
openaire   +1 more source

Polycystic ovarian disease in aquarium-managed cownose rays Rhinoptera bonasus

Diseases of Aquatic Organisms
Significant knowledge gaps remain in our understanding of the reproductive physiology and diseases of elasmobranchs. The objective of this work is to describe the clinical, imaging, and pathologic findings associated with polycystic ovaries in cownose rays housed in public aquariums.
Christa E, Barrett, Susan, Fogelson, Ariel, Carlson, Aimee, Berliner, Jamie, Torres, Lauren, Michaels, Whitney, Daniel, Samantha M, Hughes, Jessica, Comolli, Justin M, Stilwell   +9 more
openaire   +2 more sources

Habitat-specific feeding by cownose rays (Rhinoptera bonasus) of the northern Gulf of Mexico

Environmental Biology of Fishes, 2011
Past studies have suggested that increases in cownose ray (Rhinoptera bonasus) abundance may pose problems for fisheries management due to their specialized diet of exploitable mollusks. However, more recent work has identified cownose rays as opportunistic generalists, consuming mainly non- commercial prey (e.g.
Matthew Joseph Ajemian, Sean Paul Powers
openaire   +1 more source

Ontogenetic testicular development and spermatogenesis in rays: the Cownose Ray, Rhinoptera bonasus, as a model

Environmental Biology of Fishes, 2014
An understanding of testicular anatomy, development, and seasonality has implications for studies of morphology, behavior, physiology, and bioenergetics of males. Ontogenetic testicular development and spermatogenesis is essentially unknown for chondrichthyans.
Gregg R. Poulakis, Harry J. Grier
openaire   +1 more source

CLINICAL AND HISTOPATHOLOGIC OCULAR FINDINGS IN AQUARIUM-HOUSED COWNOSE RAYS (RHINOPTERA BONASUS)

Journal of Zoo and Wildlife Medicine
Cownose rays (Rhinoptera bonasus) are susceptible to ocular disease with their prominent globes, but despite being popular animals housed in aquaria, there is little published information about their normal ocular anatomy and common pathologic ocular findings.
Braidee C, Foote, Lindsay D, Seyer, Laura, Martinelli, Caroline, Betbeze, Kim, Newkirk, Karen, Terio, Xiaojuan, Zhu, James G, Johnson, Jared, Durrett, Chris, Buckner, Christa E, Barrett, Julie D, Sheldon   +11 more
openaire   +2 more sources

Age and Growth, Movements and Distribution of the Cownose Ray, Rhinoptera bonasus, in Chesapeake Bay

Estuaries, 1987
Ages were estimated for 115 of 899 cownose rays,Rhinoptera bonasus, collected primarily from commercial fishing gear, in lower Chesapeake Bay and vicinity from May through October, 1976–78. Age determinations were made using sectioned vertebral centra and estimates of von Bertalanffy parameters were for males DW∞=119.2, K=0.126, and t0=−3.699, and for ...
Joseph W. Smith, John V. Merriner
openaire   +1 more source