Hormones, aquaculture and environment protection: is it possible?
1997
Yeoh, C.G. | Schreck, C.B. | Fitzpatrick, M.S. | Feist, G.W.
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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