Abstract:
:Spermiation and changes in androgen (testosterone, T and 11-ketotestosterone, 11-KT) levels were studied in sterlet (Acipenser ruthenus) treated with GnRH agonist implants (DAla(6)-Pro(9)-LHRHa) at 25 and 75 μg kg(-1) b.w. and compared with those males treated with 4 mg kg(-1) b.w. of carp pituitary extract (CPE) and 3 pellets of Ovopel kg(-1) b.w., which contains DAla(6)-Pro(9)NEt-mGnRH and metoclopramide. Sperm quality (sperm mass, spermatozoa concentration and sperm motility and velocity) was evaluated 24, 48 and 72 h after hormonal treatments. Males did not release sperm in the control group injected with physiological solution, while sperm could not be collected 7 days after treatments in all hormonally treated groups. Spermiation rates were 100 % in the CPE and Ovopel groups and 25-50 % in the GnRHa-treated groups. Sperm production was significantly lower in the GnRHa-treated groups than in the CPE and Ovopel groups and decreased 72 h after hormonal treatment. Sperm motility and velocity were higher in the Ovopel and GnRHa (75 μg) groups compared to the CPE and GnRHa (25 μg) groups and decreased 72 h after hormonal treatment. Androgens were only affected in spermiating males and changed in the Ovopel and GnRHa (75 μg) after hormonal treatment. Significant correlations were observed between sperm production, sperm motility and sperm velocity, but not androgens. The present study suggests involvement of dopamine in sturgeon spawning. Additionally, better sperm quality observed in the Ovopel group and particularly sperm motility in the GnRHa (75 μg) suggests enhancement of sperm quality in sturgeon treated with GnRHa. Therefore, further study is needed to induce fully spermiation using GnRHa implants in combination with a dopamine inhibitor.
journal_name
Fish Physiol Biochemjournal_title
Fish physiology and biochemistryauthors
Alavi SMH,Hatef A,Mylonas CC,Gela D,Papadaki M,Rodina M,Kašpar V,Pšenička M,Podhorec P,Linhart Odoi
10.1007/s10695-012-9662-9subject
Has Abstractpub_date
2012-12-01 00:00:00pages
1655-1666issue
6eissn
0920-1742issn
1573-5168pii
10.1007/s10695-012-9662-9journal_volume
38pub_type
杂志文章abstract::Drinking in freshwater juvenile salmon was investigated in response to vasodilation by sodium nitroprusside (SNP), a nitric oxide donor, which significantly increased blood vessel diameter in Atlantic salmon alevins. Atlantic salmon fry (1-3 g), as previously shown, drank at a significant rate in fresh water which dou...
journal_title:Fish physiology and biochemistry
pub_type: 杂志文章
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journal_title:Fish physiology and biochemistry
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journal_title:Fish physiology and biochemistry
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journal_title:Fish physiology and biochemistry
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journal_title:Fish physiology and biochemistry
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doi:10.1007/BF02265127
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journal_title:Fish physiology and biochemistry
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journal_title:Fish physiology and biochemistry
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journal_title:Fish physiology and biochemistry
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