Tilapia sex reversal using methyl testosterone (MT) and its effect on fish, man and environment
Tilapia is the second leading aquatic crop globally, next to carps and its production has increased tremendously within the last decade. Its production is however affected by stunting, a phenomenon brought about by overpopulation due to precocious reproduction under mixed sex culture system. Several methods such as use of predatory fish, hybridization, polyploidy and sex reversal, using methyl testosterone have been employed w1th different degrees of success. This paper reviews the use of methyl testosterone in sex reversal of tilapia and its consequent effects on fish, man and environment. It established the preference of all-male tilapia due to better and more uniform growth under culture system. It has been demonstrated that the hormone does not have any adverse effect on fish flesh after cessation of treatment of tilapia fry. In like manner; ingestion of fish produced by sex reversal does not therefore harm man. However,one is not too sure of the effect of the hormone or its by- products on vital organs (liver, kidney, pancreas and gills), metabolic profile and nucleic acids. This may also affect muscle building and perceived libido-enhancement in man. On the environment, the steroid is either biodegraded or mineralized. It must be stated that escapee from tilapia hatchery into the natural water may, however, alter the dynamics of the environment due to unforeseen consequences.
| Main Authors: | , |
|---|---|
| Format: | conference_item biblioteca |
| Language: | English |
| Published: |
FISON
2013
|
| Subjects: | Aquaculture, Biology, Oreochromis niloticus, Nigeria, Sex reversal, Tilapia, Man, Environment, freshwater environment, automation, |
| Online Access: | http://hdl.handle.net/1834/39040 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Tilapia is the second leading aquatic crop globally, next to carps and its production has increased tremendously within the last decade. Its production is however affected by stunting, a phenomenon brought about by overpopulation due to precocious reproduction under mixed sex culture system. Several methods such as use of predatory fish, hybridization, polyploidy and sex reversal, using methyl testosterone have been employed w1th different degrees of success. This paper reviews the use of methyl testosterone in sex reversal of tilapia and its consequent effects on fish, man and environment. It established the preference of all-male tilapia due to better and more uniform growth under culture system. It has been demonstrated that the hormone does not have any adverse effect on fish flesh after cessation of treatment of tilapia fry. In like manner; ingestion of fish produced by sex reversal does not therefore harm man. However,one is not too sure of the effect of the hormone or its by- products on vital organs (liver, kidney, pancreas and gills), metabolic profile and nucleic acids. This may also affect muscle building and perceived libido-enhancement in man. On the environment, the steroid is either biodegraded or mineralized. It must be stated that escapee from tilapia hatchery into the natural water may, however, alter the dynamics of the environment due to unforeseen consequences. |
|---|