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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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Associated URL
evols.library.manoa.hawaii.edu
Date
2002
Author
Hilomen-Garcia, G. V.
Baldevarona, R. B.
Lacanilao, F.
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104
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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
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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  • AQD Journal Articles [1196]

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