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Induction of sex inversion in juvenile grouper, Epinephelus suillus, (Valenciennes) by injections of 17α-Methyltestosterone

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Date
1994
Author
Tan-Fermin, Josefa D.
Garcia, Luis Maria ORCID
Castillo, Antonio R., Jr.
Page views
2,255
ASFA keyword
aquaculture ASFA
fish culture ASFA
sexual maturity ASFA
sex determination ASFA
sex hormones ASFA
testosterone ASFA
sex reversal ASFA
hermaphroditism ASFA
females ASFA
spermatogenesis ASFA
age ASFA
weight ASFA
AGROVOC keyword
steroid hormones AGROVOC
experimentation AGROVOC
groupers AGROVOC
Taxonomic term
Epinephelus suillus GBIF
Metadata
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Abstract
Four groups of two-year old juvenile groupers (Epinephelus suillus), each with 8-9 individuals of mean body weight (BW) 1.2 kg, were treated with 17α-methyltestosterone (MT). MT was injected intramuscularly within the range of 0.5-5.0 mg kg-1 BW every 15 days. Gonadal biopsy and stripping of the abdomen was done every 15 days, the fish being sacrificed after six or twelve injections. Initial controls had immature ovaries containing primary oocytes in lamellae that extended into the central lumen. After six injections, proliferation of stromal and gonial cells were observed in all fish sampled. Regardless of treatment, gonad sections of fish with a minimum BW of 1.2 kg showed degeneration of primary oocytes and the presence of spermatogenic cells. Milt was also present in larger-sized fish (BW: 1.5 kg) given 0, 0.5 and 1.0mg MTkg-1 BW, after such fish had received an accumulated dose of 5 or 12mg MTkg-1 BW. However, gonad sections of smaller-sized fish following these treatments contained only primary oocytes and gonial cells after six (BW: 0.7-1.0kg) or twelve (BW: 0.6-1.3 kg) injections. In contrast, all fish treated with 5 mg MT kg-1 BW had testes in active spermatogenesis after six (BW: 1.2-1.6 kg) or twelve (BW: 0.8 kg) injections. Gonad weight and gonadosomatic index values decreased during consecutive sampling. Induction of female-to-male sex inversion in juvenile E. suillus by MT was probably synergistic with age and size.
URI
http://hdl.handle.net/10862/1465
Suggested Citation
Tan-Fermin, J. D., Garcia, L. M., & Castillo, A. R., Jr. (1994). Induction of sex inversion in juvenile grouper, Epinephelus suillus, (Valenciennes) by injections of 17α-Methyltestosterone. Bulletin of Environmental Contamination and Toxicology, 40(4), 413-420. http://hdl.handle.net/10862/1465
Type
Article
ISSN
0021-5090
Koleksi
  • Journal Articles [1183]

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