Monosex male production in finfish as exemplified by tilapia: applications, problems, and prospects

The use of monosex fish is intrinsically desirable in a variety of fish species in a range of aquaculture production systems. The potential advantages sought from their use may include one or more of the following features: achievement of higher average growth rate, elimination of reproduction, redu...

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Bibliographic Details
Published in:Aquaculture 2001-06, Vol.197 (1), p.283-301
Main Authors: Beardmore, J.A, Mair, G.C, Lewis, R.I
Format: Article
Language:English
Subjects:
Animal aquaculture
Animal productions
Animal reproduction
Aquaculture
Aquaculture techniques
Biological and medical sciences
Fish
fish culture
Freshwater
Fundamental and applied biological sciences. Psychology
GMT
Males
Monosex
monosex culture
Pisciculture
Tilapia
Tilapia nilotica
Vertebrate aquaculture
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Summary:The use of monosex fish is intrinsically desirable in a variety of fish species in a range of aquaculture production systems. The potential advantages sought from their use may include one or more of the following features: achievement of higher average growth rate, elimination of reproduction, reduction of sexual/territorial behaviour, reduction of variation in harvest size, and reduction of risk of environmental impact resulting from escapes of exotic species. Fish as a group have systems of sex determination which are of considerable biological interest and significance for studies in evolutionary biology. However, they are very variable, relatively poorly understood and give rise to much variation in sex ratio between, and within, species. Enough is known, however, to enable us to say that these systems are often employed in ways which sharply distinguish the fishes from groups such as mammals, birds and reptiles. As a consequence, manipulations of sexual phenotype designed to produce monosex populations are not straightforward and the results are not necessarily predictable. This paper reviews the techniques for production of monosex males, and considers in detail the case of the YY/GMT technology in the Nile tilapia, which is the only example of a genetic technology for the production of monosex males so far widely adopted by the aquaculture industry. The considerable benefits accruing from the use of GMT are described. An attempt at projecting future developments in this area of aquaculture is made.
ISSN:0044-8486
1873-5622
DOI:10.1016/S0044-8486(01)00590-7