Hormones aquaculture and environment protection: is it possible

Yeoh C.G., . and Schreck C.B., . and Fitzpatrick M.S., . and Feist G.W., . (1997) Hormones aquaculture and environment protection: is it possible. [Proceedings Paper]

To maximise the efficiency of an aquaculture facility innovative technology can be implemented. Producing marketable fish of the desired gender in the shortest time has obvious monetary advantages. By using chromosomal manipulation and hormonal techniques we have successfully raised fish of the desired gender. Using either gynogenesis or androgenesis and with the combination of hormones such as 17 beta-estradiol or 17a-methyltesterone MT we have shown that sex manipulation is possible. We have demonstrated a technique for the production of stocks of sex-reversed all-female teleosts. These animals were sex-reversed to cretae a source of XX sperm for further production of all female populations. This technique which requires only brief immersions of larvae in MT or a combination of immersions plus feeding of this steroid is simple cost effective and could be utilised in a hatchery setting. Sperm from XX males can be cryopreserved to generate all female populations for years. Preservation of XX sperm has applications both in the conservation sectors by preserving selected genetic lines and in the competitive commercial sectors by increasing production of meat and more importantly eggs. This technique which uses lesser amounts of hormones allows us to dispose or recycle the steroids in a responsible manner. Irresponsible use of steroids can affect teleosts living in local water bodies.

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Abstract

To maximise the efficiency of an aquaculture facility innovative technology can be implemented. Producing marketable fish of the desired gender in the shortest time has obvious monetary advantages. By using chromosomal manipulation and hormonal techniques we have successfully raised fish of the desired gender. Using either gynogenesis or androgenesis and with the combination of hormones such as 17 beta-estradiol or 17a-methyltesterone MT we have shown that sex manipulation is possible. We have demonstrated a technique for the production of stocks of sex-reversed all-female teleosts. These animals were sex-reversed to cretae a source of XX sperm for further production of all female populations. This technique which requires only brief immersions of larvae in MT or a combination of immersions plus feeding of this steroid is simple cost effective and could be utilised in a hatchery setting. Sperm from XX males can be cryopreserved to generate all female populations for years. Preservation of XX sperm has applications both in the conservation sectors by preserving selected genetic lines and in the competitive commercial sectors by increasing production of meat and more importantly eggs. This technique which uses lesser amounts of hormones allows us to dispose or recycle the steroids in a responsible manner. Irresponsible use of steroids can affect teleosts living in local water bodies.

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Item Type:	Proceedings Paper
AGROVOC Term:	HORMONES
AGROVOC Term:	AQUACULTURE
AGROVOC Term:	ENVIRONMENTAL PROTECTION
AGROVOC Term:	CHROMOSOME MANIPULATION
AGROVOC Term:	GYNOGENESIS
AGROVOC Term:	ANDROGENESIS
AGROVOC Term:	FISHERY PRODUCTION
AGROVOC Term:	MALAYSIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16107

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