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Milt production of sea bass Lates calcarifer Bloch administered an analogue of luteinizing hormone-releasing hormone and 17α-methyltestosterone

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evols.library.manoa.hawaii.edu
Date
2002
Author
Hilomen-Garcia, G. V.
Baldevarona, R. B.
Lacanilao, F.
Page views
2,207
Subject
aquaculture techniques ASFA
breeding stock ASFA
fish culture ASFA
hormones ASFA
induced ovulation ASFA
males ASFA
sex hormones ASFA
sexual maturity ASFA
sexual reproduction ASFA
sperm ASFA
Lates calcarifer AGROVOC
sea bass AGROVOC
LH AGROVOC
Taxonomic term
Lates calcarifer GBIF
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Abstract
The milt production responses of sexually mature sea bass Lates calcarifer to (D-Ala6, Pro9-N- ethylamide) luteinizing hormone-releasing hormone (LHRHa) and 17α-methyltestosterone injections were examined.

At 24 h after injection of a low dose of LHRHa (20 μg/kg BW), the sperm count decreased significantly compared to saline-treated fish, but it returned to pre-treatment levels 48 h after injection, suggesting a possible hydration of the milt. Other milt parameters (milt volume, spermatocrit, sperm production) in LHRHa-treated fish did not vary from their controls at 24 or 48 h after injection but the overall pattern suggested a reduction in milt viscosity. Total expressible milt and spermatozoa collected over the 48-h experiment was approximately three-fold higher in LHRHa-injected fish than in saline-injected fish, indicating a stimulation of spermatozoa production, not merely milt dilution due to hydration.

In a second experiment, sperm count and spermatocrit were significantly lower than those of saline-injected fish at 17 and 48 h after a single injection of a high dose of LHRHa (80 μg/kg BW). A methyltestosterone injection combined with the LHRHa injection also resulted in a significantly lower sperm count, but the spermatocrit remained comparable to the control group, suggesting a suppression of the LHRHa-induced milt hydration response.

Results demonstrate that LHRHa stimulates milt hydration and spermatozoa production in milting sea bass and that a simultaneous methyltestosterone injection partially suppresses this response.
URI
http://hdl.handle.net/10862/1931
Suggested Citation
Hilomen-Garcia, G. V., Baldevarona, R. B., & Lacanilao, F. (2002). Milt production of sea bass Lates calcarifer Bloch administered an analogue of luteinizing hormone-releasing hormone and 17α-methyltestosterone. The Israeli Journal of Aquaculture-Bamidgeh, 54(4), 173-182. http://hdl.handle.net/10862/1931
Type
Article
ISSN
0792-156X
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  • Journal Articles [1155]

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