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Questions and Answers
How is the hormone typically applied in aquaculture?
What is a potential side effect of the hormone in animals?
How quickly is the hormone eliminated from the body?
What is the shelf-life of the hormone in feed?
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Why should the hormone be protected from direct sunlight?
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What is the recommended dosage of the hormone for improving growth in fish and shellfish?
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What is the shelf life of the hormone in fish and shellfish?
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How is serotonin administered to shellfish?
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What is the function of serotonin in shellfish?
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What is the recommended dosage of the hormone for fish and shellfish?
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What is the mode of excretion of serotonin in the animal body?
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What is the target organism for the hormone in aquaculture?
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In what percentage of time is the hormone eliminated from the body?
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What is the purpose of using the hormone in aquaculture?
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How is the hormone administered to target organisms through feed?
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What is the shelf-life of the hormone from the date of incorporation?
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What is the recommended dosage of the hormone through diet?
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What happens to the hormone when exposed to light?
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What is the functional component of 17α-Ethynyltestosterone?
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At what dosage does 17α-Ethynyltestosterone stimulate the undifferentiated gonad to differentiate into the testis?
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What is the recommended method of applying 17α-Ethynyltestosterone in aquaculture?
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What is the side effect observed in animals during treatment with 17α-Ethynyltestosterone?
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What is the shelf-life of 17α-Ethynyltestosterone from the date of incorporation into the feed?
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What is the primary use of 17α-Ethynyltestosterone?
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What is the functional component of 17β-0estradiol?
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What is the mode of action of 17β-0estradiol?
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How is 17β-0estradiol typically administered in aquaculture?
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What happens to 17β-0estradiol in the environment?
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What is the recommended dosage of 17β-0estradiol through diet?
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What is the use of 17β-0estradiol in aquaculture?
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Study Notes
Hormonal Applications in Aquaculture
- Hormones can be applied through feed or medium incorporation.
- Commonly used hormones include 17α-Ethynyltestosterone, 17β-Estradiol, 17α-Ethinyloestradiol, and Diethylstilbestrol.
Mode of Action
- 17α-Ethynyltestosterone (ET) stimulates undifferentiated gonads to develop into testis at low doses (25-100 ppm).
- 17β-Estradiol triggers differentiation into ovaries.
- 17α-Ethinyloestradiol also directs gonadal differentiation towards ovaries.
Target Organisms
- The hormones primarily target fish and shellfish, aiding in seed production and growth regulation.
Side Effects and Environmental Impact
- Hepatotoxicity is a potential side effect of the hormone ET during treatment.
- No known deleterious effects on the environment are observed for most hormones.
- Hormones are photosensitive and should be protected from sunlight.
Residue Management
- Hormonal residues are metabolized and mostly eliminated within 24 hours, with more than 90% excretion noted.
- Serotonin and other hormones remain unknown regarding their environmental and residue effects.
Application Recommendations
- Hormones should be incorporated into feed for optimal administration.
- Dosage recommendations vary:
- ET: 25-100 ppm for all-male seed production, 1-10 ppm for growth enhancement.
- 17β-Estradiol: 20-120 ppm through diet or 75-400 mg/L via immersion.
- 17α-Ethinyloestradiol: 20-120 ppm through diet or 75-400 μg/L via immersion.
- Diethylstilbestrol promotes growth but lacks detailed dosage recommendations.
Shelf-life and Storage
- Hormones have a shelf-life of 90 days post incorporation into feed.
- Photosensitivity necessitates storage in dark conditions.
Conclusion
- Hormones play crucial roles in aquaculture for gender control and growth enhancement.
- Careful application, monitoring for side effects, and residue management are essential for sustainable practices.
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Description
Learn about the mode of application, side effects, and environmental impact of a hormone used in aquaculture. Understand how to prepare the hormone for use and its metabolism in the animal body.
