Diets of Atlantic Sharpnose Shark (Rhizoprionodon terraenovae) and Bonnethead (Sphyrna tiburo) in the northern Gulf of Mexico
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Field hearing measurements of the Atlantic sharpnose shark Rhizoprionodon terraenovae.
Field measurements of hearing thresholds were obtained from the Atlantic sharpnose shark Rhizoprionodon terraenovae using the auditory evoked potential method (AEP). The fish had most sensitive hearing at 20 Hz, the lowest frequency tested, with decreasing sensitivity at higher frequencies. Hearing thresholds were lower than AEP thresholds previously measured for the nurse shark Ginglymostoma c...
متن کاملThe Reproductive Biology of the Atlantic Sharpnose Shark, Rhizoprionodon Terraenovae (richardson)
Atlantic sharpnose sharks, Rhizo]Jrionodon terraeno/Jae (Richardson), were collected in the north central Gulf of Mexico from June 1979 to May 1980. The principal sampling devices employed were longline, trawl, and rod and reel. From a total of 215 Atlantic sharpnose sharks obtained during the study, 144 were female and 71 were male, ranging from 30 to 107 cm total lengths. The reproductive ana...
متن کاملMitochondrial DNA diversity and divergence among sharpnose sharks , Rhizoprionodon terraenovae , from the Gulf of Mexico and Mid - Atlantic Bight
-The Atlantic sharpnose shark, Rhizoprionodon terraenovae, is a small coastal shark that is harvested in both directed and nondirected fisheries throughout its range. Because pups of this species are found both along the southeastern U.S. Atlantic coast and the Gulf of Mexico, it is possible that multiple isolated breeding stocks exist. Restriction fragment length polymorphism analysis ofmitoch...
متن کاملHuffmanela markgracei sp. n. (Nematoda: Trichosomoididae) from buccal cavity of Atlantic sharpnose shark, Rhizoprionodon terraenovae (Carcharhiniformes: Carcharhinidae), in the northwestern Gulf of Mexico off Texas.
Eggs of Huffmanela markgracei sp. n. infected one of three Atlantic sharpnose sharks, Rhizoprionodon terraenovae (Richardson) (Carcharhiniformes: Carcharhinidae) captured by bottom long-line in the northwestern Gulf of Mexico off Padre Island, Texas. Eggs in the skin formed sinuous tracks (1-8 eggs wide; 1-4 eggs deep; 150 eggs/mm2) occupying a swath of the skin 22 cm x 2 cm on the tongue, bran...
متن کاملBite force and performance in the durophagous bonnethead shark, Sphyrna tiburo.
Bite force, a measure of performance, can be used to link anatomical form and function. Earlier studies have shown bite force to have a significant influence on dietary constraints and ontogenetic shifts in resource utilization. The bonnethead shark, Sphyrna tiburo, is a durophagous member of the family Sphyrnidae. Its diet in South Florida waters consists almost entirely of blue crabs, which a...
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ژورنال
عنوان ژورنال: Gulf and Caribbean Research
سال: 2016
ISSN: 1528-0470
DOI: 10.18785/gcr.2701.05