Comparative evaluation of Carp testis as an alternative to 17 α-Methyltestosterone on Tilapia sex reversal

Abstract

17 α-Methyltestosterone (MT) is a commonly used synthetic androgen for the all male tilapia fry production. The probable residual effect of MT on human health and environment has been a concern. Two trials for two seasons were conducted to evaluate the effectiveness of carp testis (CT), as a source of natural androgen, on sex reversal of Nile tilapia (Oreochromis niloticus) and compare it with MT at Department of Aquaculture, Agriculture and Forestry University, Nepal, using completely randomised block deign (RCBD). Altogether 8 treatments with 4 for methyltestosterone (40 mg MT kg -1 of diet) and 4 for 75% rohu (Labeo rohita) testis. Both source of androgen were fed for 15, 18, 21 or 24 days. Treatments were replicated thrice. The result of methyltestosterone feeding for 24 days showed significantly (p<0.05) higher percentage of male (98.5±1.5) than 15 days (87.1±3.5) but was statistically similar with 18 (91.8±2.6) and 21(94.3±3.0) days feeding. Similarly percentage of male obtained with18 (84.8 ±2.1) and 21 (85.8 ±2.9) days of CT feeding were statistically similar(p>0.05) with 24 days and also with 15 days CT treatment but the result of 24 days CT feeding was significantly higher (91.4 ±1.2) than 15 days (82.5 ±2.7) of carp testis feeding.

Masculinization in common carp (Cyprinus carpio) by androgen immersion: The interaction effect of hormone concentration and immersion time

“…It was perceived during experimental trial that longer the immersion time, more survival threats would be there for hatchlings. Hence, greater chances of survival are expected with control group while group of fingerlings confronting the hormones (either through feeding or via immersion time), however drive an opposed conclusion as Khanal et al(2014) reported.…”

“…By utilizing egg immersion technique, commercially beneficial results in various fish species have been obtained. Groups confronting the hormones (through immersion times) produced pronounced gain in maleness percent as found in work of Khanal et al (2014).…”

Effect of 17 Aplha Methyl Testosterone on Sex Reversal of Oreochromis Niloticus Fry

“…[23] used a dose rate of 75mg 17α-MT in feed and recorded a maximum O. mossambicus male production of 98.09% [33]. Administration of 17α-MT effectively masculinized Rhamdia quelen fry; however, the lowest dose of 60 mg/kg of feed is recommended, since higher doses have inhibitory effects on gonadal development in both sexes [20] found that Labeo rohita testis produced more male population and can safely and effectively replace the synthetic 17 α-MT.…”

EFFECT OF 17α-Methyltestosterone RESIDUES ON RATS' LIVER

“…All-male monosex culture is characterized by greater uniformity in growth, size and body weight, better flesh quality, more rapid growth and the lack of spawning. (5) Androgens, such as 17 α-methyl testosterone (MT), and carp testis (natural androgen), are widely used in this respect (6) as well as trenbolone or nonsteroidal aromatase inhibitors, such as fadrozole, which Introduction In current days most of Tilapia Nilotica (Oreochromis Nilotica) in Egyptian market comes from Monosex farming by using 17 α-Methyltestosterone (MT) sometimes misuse of this hormone cause harmful effect on a human who consumed fish containing MT hormone residues as it cause problems in puberty for girls and boys, liver tumors, carcinoma and increases embryo mortality.…”