The Reproductive Biology of the Finetooth Shark, Carcharhinus isodon, in the Northwest Atlantic Ocean
Shark fisheries are a multimillion dollar industry in the United States and have significant contributions both recreationally and commercially. In order to maintain this industry, fisheries must be properly managed. An understanding of life history and reproduction is crucial in order to adequately...
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ftunivnflorida:oai:digitalcommons.unf.edu:etd-1594 2023-05-15T17:45:34+02:00 The Reproductive Biology of the Finetooth Shark, Carcharhinus isodon, in the Northwest Atlantic Ocean Brown, Amanda 2015-01-01T08:00:00Z application/pdf https://digitalcommons.unf.edu/etd/564 https://digitalcommons.unf.edu/cgi/viewcontent.cgi?article=1594&context=etd unknown UNF Digital Commons https://digitalcommons.unf.edu/etd/564 https://digitalcommons.unf.edu/cgi/viewcontent.cgi?article=1594&context=etd UNF Graduate Theses and Dissertations Thesis University of North Florida UNF Dissertations Academic -- UNF -- Master of Science in Biology Academic -- UNF -- Biology reproduction endocrinology morphology sharks fisheries Animal Sciences Aquaculture and Fisheries Biology Marine Biology thesis 2015 ftunivnflorida 2022-12-09T08:01:18Z Shark fisheries are a multimillion dollar industry in the United States and have significant contributions both recreationally and commercially. In order to maintain this industry, fisheries must be properly managed. An understanding of life history and reproduction is crucial in order to adequately manage shark fisheries. The finetooth shark, Carcharhinus isodon, is a member of the small coastal shark (SCS) fishery complex. It is found in Atlantic waters from South Carolina to Florida and throughout the Gulf of Mexico. This species has recently come under increased fishing pressure and has previously been overfished. New data is needed in order to properly assess the reproductive capacity of this species so that healthy populations can be sustained. This study evaluated the overall reproductive cycle of northwest Atlantic populations of C. isodon using composite variables of morphology, histology and endocrinology. Atlantic C. isodon were found to display seasonal reproduction with biennial reproductive periodicity with a 12 month gestation period and litters of 2-6 pups. E2 and T displayed similar patterns and were highest during gametogenesis. P4 did not show any discernible patterns. Estrogen receptors were found in developing follicles of gravid and non-gravid females, in the oviducal glands of non-gravid and early pregnant females and in the uterus of pre-ovulatory females. P4 was found in the oviducal glands in all reproductive stages and in the uterus of pre-ovulatory females. Androgen receptors were found in Sertoli cells and mature spermatozoa as well as epididymal epithelial cells. Thesis Northwest Atlantic University of North Florida (UNF): Digital Commons |
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University of North Florida (UNF): Digital Commons |
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Thesis University of North Florida UNF Dissertations Academic -- UNF -- Master of Science in Biology Academic -- UNF -- Biology reproduction endocrinology morphology sharks fisheries Animal Sciences Aquaculture and Fisheries Biology Marine Biology |
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Thesis University of North Florida UNF Dissertations Academic -- UNF -- Master of Science in Biology Academic -- UNF -- Biology reproduction endocrinology morphology sharks fisheries Animal Sciences Aquaculture and Fisheries Biology Marine Biology Brown, Amanda The Reproductive Biology of the Finetooth Shark, Carcharhinus isodon, in the Northwest Atlantic Ocean |
topic_facet |
Thesis University of North Florida UNF Dissertations Academic -- UNF -- Master of Science in Biology Academic -- UNF -- Biology reproduction endocrinology morphology sharks fisheries Animal Sciences Aquaculture and Fisheries Biology Marine Biology |
description |
Shark fisheries are a multimillion dollar industry in the United States and have significant contributions both recreationally and commercially. In order to maintain this industry, fisheries must be properly managed. An understanding of life history and reproduction is crucial in order to adequately manage shark fisheries. The finetooth shark, Carcharhinus isodon, is a member of the small coastal shark (SCS) fishery complex. It is found in Atlantic waters from South Carolina to Florida and throughout the Gulf of Mexico. This species has recently come under increased fishing pressure and has previously been overfished. New data is needed in order to properly assess the reproductive capacity of this species so that healthy populations can be sustained. This study evaluated the overall reproductive cycle of northwest Atlantic populations of C. isodon using composite variables of morphology, histology and endocrinology. Atlantic C. isodon were found to display seasonal reproduction with biennial reproductive periodicity with a 12 month gestation period and litters of 2-6 pups. E2 and T displayed similar patterns and were highest during gametogenesis. P4 did not show any discernible patterns. Estrogen receptors were found in developing follicles of gravid and non-gravid females, in the oviducal glands of non-gravid and early pregnant females and in the uterus of pre-ovulatory females. P4 was found in the oviducal glands in all reproductive stages and in the uterus of pre-ovulatory females. Androgen receptors were found in Sertoli cells and mature spermatozoa as well as epididymal epithelial cells. |
format |
Thesis |
author |
Brown, Amanda |
author_facet |
Brown, Amanda |
author_sort |
Brown, Amanda |
title |
The Reproductive Biology of the Finetooth Shark, Carcharhinus isodon, in the Northwest Atlantic Ocean |
title_short |
The Reproductive Biology of the Finetooth Shark, Carcharhinus isodon, in the Northwest Atlantic Ocean |
title_full |
The Reproductive Biology of the Finetooth Shark, Carcharhinus isodon, in the Northwest Atlantic Ocean |
title_fullStr |
The Reproductive Biology of the Finetooth Shark, Carcharhinus isodon, in the Northwest Atlantic Ocean |
title_full_unstemmed |
The Reproductive Biology of the Finetooth Shark, Carcharhinus isodon, in the Northwest Atlantic Ocean |
title_sort |
reproductive biology of the finetooth shark, carcharhinus isodon, in the northwest atlantic ocean |
publisher |
UNF Digital Commons |
publishDate |
2015 |
url |
https://digitalcommons.unf.edu/etd/564 https://digitalcommons.unf.edu/cgi/viewcontent.cgi?article=1594&context=etd |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
UNF Graduate Theses and Dissertations |
op_relation |
https://digitalcommons.unf.edu/etd/564 https://digitalcommons.unf.edu/cgi/viewcontent.cgi?article=1594&context=etd |
_version_ |
1766148675992551424 |