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Spermiation in captive striped bass:...

Vuthiphandchai, Verapong.

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Spermiation in captive striped bass: Sperm quality parameters and manipulation by hormonal and photoperiod treatments.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spermiation in captive striped bass: Sperm quality parameters and manipulation by hormonal and photoperiod treatments./
Author:	Vuthiphandchai, Verapong.
Description:	250 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-04, Section: B, page: 1362.
Contained By:	Dissertation Abstracts International60-04B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9926801
ISBN:	9780599265721

Spermiation in captive striped bass: Sperm quality parameters and manipulation by hormonal and photoperiod treatments.
Vuthiphandchai, Verapong.

Spermiation in captive striped bass: Sperm quality parameters and manipulation by hormonal and photoperiod treatments. - 250 p.

Source: Dissertation Abstracts International, Volume: 60-04, Section: B, page: 1362.

Thesis (Ph.D.)--University of Maryland, College Park, 1999.

The objective of the present study was to expand our understanding of sperm quality in captive striped bass of different age classes and stripping frequency treatments, evaluate the respective relationships of sperm to egg ratio and sperm motility to fertilization, and control the onset and intensities of spermiation in captive striped bass by hormonal and photoperiod approaches to ensure a year-round supply of spermiating males. Striped bass maintained in captivity exhibited age-related quantitative and qualitative changes in sperm quality. The 3-yr-old fish had significantly higher levels of sperm concentration and sperm motility than the 1- and 12-yr-old fish. There were no differences in sperm quality parameters (morphology, viability, motility, sperm concentration) and hormone profiles in striped bass stripped once every 7, 14 and 21 days, although sperm quality tended to decrease during the Spring spawning season due to sperm ageing, a natural phenomenon for seasonal breeder. Using the sperm of striped bass, white perch and white bass as models, sperm to egg ratio plays a significant role in determining fertilization success. In addition, sperm motility is also a factor in the success of fertilization. Treating striped bass with increasing doses of GnRHa via a controlled-released polymeric delivery system (microspheres) induced sustained milt production for up to 14 days without a negative effect on sperm quality. The lowest dose of GnRHa microspheres (15 m g/kg BW) resulted in a long-term stimulation of sperm production, compared to treatments with human chorionic gonadotropin (hCG) and carp pituitary extract (CPE). Plasma levels of T, 11-KT and 17,20 b -P elevated or peaked during spermiation in response to hormone treatments. Photoperiod manipulation is an effective tool for shifting the peak of spermiation in captive-reared striped bass, resulting in a year-round supply of spermiating males without negative effects on sperm quality. However, phase-shifted (advanced and delayed) photoperiod regimes did not result in generating a distinct separation in the spermiation periods of the two photoperiod regimes. This research led to a better understanding of sperm physiology parameters, factors involved in regulating fertilization efficiency and spermiation, and endocrine regulation of spermiation in striped bass.

ISBN: 9780599265721Subjects--Topical Terms:

1017726
Biology, Ecology.

Spermiation in captive striped bass: Sperm quality parameters and manipulation by hormonal and photoperiod treatments.
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100 1 $a Vuthiphandchai, Verapong. $3 1924460
245 1 0 $a Spermiation in captive striped bass: Sperm quality parameters and manipulation by hormonal and photoperiod treatments.
300 $a 250 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-04, Section: B, page: 1362.
500 $a Chair: Yonathan Zohar.
502 $a Thesis (Ph.D.)--University of Maryland, College Park, 1999.
520 $a The objective of the present study was to expand our understanding of sperm quality in captive striped bass of different age classes and stripping frequency treatments, evaluate the respective relationships of sperm to egg ratio and sperm motility to fertilization, and control the onset and intensities of spermiation in captive striped bass by hormonal and photoperiod approaches to ensure a year-round supply of spermiating males. Striped bass maintained in captivity exhibited age-related quantitative and qualitative changes in sperm quality. The 3-yr-old fish had significantly higher levels of sperm concentration and sperm motility than the 1- and 12-yr-old fish. There were no differences in sperm quality parameters (morphology, viability, motility, sperm concentration) and hormone profiles in striped bass stripped once every 7, 14 and 21 days, although sperm quality tended to decrease during the Spring spawning season due to sperm ageing, a natural phenomenon for seasonal breeder. Using the sperm of striped bass, white perch and white bass as models, sperm to egg ratio plays a significant role in determining fertilization success. In addition, sperm motility is also a factor in the success of fertilization. Treating striped bass with increasing doses of GnRHa via a controlled-released polymeric delivery system (microspheres) induced sustained milt production for up to 14 days without a negative effect on sperm quality. The lowest dose of GnRHa microspheres (15 m g/kg BW) resulted in a long-term stimulation of sperm production, compared to treatments with human chorionic gonadotropin (hCG) and carp pituitary extract (CPE). Plasma levels of T, 11-KT and 17,20 b -P elevated or peaked during spermiation in response to hormone treatments. Photoperiod manipulation is an effective tool for shifting the peak of spermiation in captive-reared striped bass, resulting in a year-round supply of spermiating males without negative effects on sperm quality. However, phase-shifted (advanced and delayed) photoperiod regimes did not result in generating a distinct separation in the spermiation periods of the two photoperiod regimes. This research led to a better understanding of sperm physiology parameters, factors involved in regulating fertilization efficiency and spermiation, and endocrine regulation of spermiation in striped bass.
590 $a School code: 0117.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Animal Physiology. $3 1017835
650 4 $a Agriculture, Fisheries and Aquaculture. $3 1020913
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710 2 $a University of Maryland, College Park. $3 657686
773 0 $t Dissertation Abstracts International $g 60-04B.
790 1 0 $a Zohar, Yonathan, $e advisor
790 $a 0117
791 $a Ph.D.
792 $a 1999
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