+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Reproduction and embryonic development of the sand tiger shark odontaspis taurus



Reproduction and embryonic development of the sand tiger shark odontaspis taurus



Fishery Bulletin (Washington D C) 81(2): 201-226



The capture of 1 ripe male, 191.5 cm TL [total length] and 26 pregnant females, 236.6-274.3 cm TL, sand tiger sharks, O. taurus, from the east-central coast of Florida [USA] from 1946 to 1980 has permitted examination of early reproductive activity and embryonic development in this species. Variations in ovulation rates and oviducal gland activity produce 6 distinct egg capsule types at varying times during gestation. Some egg capsules produced during early gestation contain only ovalbumin and/or mucus while others contain several fertilized ova. As gestation proceeds, more capsules contain unfertilized ova and ovulation rates increase. These latter capsules serve principally as food for the surviving embryo. Sixty-two embryos, 13-1060 mm TL, provided information on intrauterine development which allowed classification of 7 developmental periods based on gestation time, embryonic anatomy, posture, activity, and source of nutrition. Initially, embryos 13-18.5 mm TL obtain nutrition from internal coelomic yolk supplies during a period of early tissue differentiation. In embryos between 18.5 and 51 mm TL, consumption of encapsulated yolk supplies occurs until hatching, between 49 and 63 mm TL. After hatching, the embryo absorbs yolk-sac nutritive supplies and may also consume uterine fluid. At about 100 mm TL, the embryo begins to hunt and consume other intrauterine embryos. At 7-9 mo. into gestation, ova are no longer fertilized. In each uterus, the single remaining embryo, 334-1060 mm TL, consumes enlarged yolk capsules containing 7-23 unfertilized ova. Just prior to parturition the maternal ovary is greatly reduced in size, few egg capsules are found within the uteri, and in each uterus the remaining embryo exhibits reduced yolk consumption and an enlarged liver. Parturition observed in captivity typically takes place from Dec. through March, after 9-12 mo. of gestation. Newborn juveniles are about 100 cm long. [The cannibalistic and oophagous behavior is described.].

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 006315413

Download citation: RISBibTeXText


Related references

Urogenital schistosomiasis computed tomographic evaluation. Radiology 157(3 Part 1): 745-750, 1985

Isolation and characterization of regulatory mutations affecting the expression of the gua ba operon of escherichia coli k 12. Molecular and General Genetics 195(1-2): 77-82, 1984

A second record of Prophyridium sordidum Geitler. J Phycol 3(1): 34-36, 1967

On the primacy of primordial RNA. Biosystems 202: 175-180, 1987

Variation in the teeth of Nereis. Biol Bull, II 129-143, 1900

First record of the belontid fish Macropodus cupanus Valenciennes from Pune, Maharashtra. Journal of the Bombay Natural History Society 881: 124-125, 1991

Gingival metastasis of a bronchogenic adenocarcinoma: report of a case. Oral Surgery Oral Medicine Oral Pathology Oral Radiology and Endodontics 104(6): E25-E28, 2007

First record of the bee species Colletes mlokossewiczi Radoszkowski, 1891 in Germany. Entomologische Nachrichten Und Berichte: 2, 115-117, 2008

Gingival hyperplasia proliferation in the El Hierro giant lizard Gallotia simonyi Proliferacion hiperplasica gingival en un lagarto gigante de El Hierro Gallotia simonyi. Boletin de la Asociacion Herpetologica Espanola. agosto; 121: 29-31, 2001

Buoyancy measurements and vertical distribution of eggs of sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus). ine Biology 145(5): 9-70, 2004

Analysis of dendritic cells in the peripheral blood of patients with breast cancer. European Journal of Cancer 38(Suppl. 3): S55, 2002

Tooth replacement in the Late Cretaceous mosasaur Clidastes. Journal of Herpetology 39(4): 688-692, 2005

First Isolates of Leptospira spp., from Rodents Captured in Angola. American Journal of Tropical Medicine and Hygiene 94(5): 955-958, 2016

The complete mitochondrial genome of the salmon shark, Lamna ditropis (Chondrichthyes, Lamnidae). Mitochondrial Dna. Part A Dna Mapping Sequencing and Analysis 27(1): 316-317, 2016

Reproductive dysfunction in women with epilepsy: recommendations for evaluation and management. Journal of Neurology, Neurosurgery, and Psychiatry 73(2): 121-125, 2002