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Top Tips For Healthy And Fast Crab Fattening

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By Author: bharathi
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Crab fattening is a very lucrative part of aquaculture, especially in coastal areas where mud crabs (Scylla spp.) are highly prized for their meaty, flavorful claws and bountiful roe. But to achieve maximum weight gain and market suitability in the shortest period, crab farmers need to adopt intelligent, science-based practices. Astro Aquaculture, a reputable brand in sustainable and productive aquaculture solutions, presents its expert advice on healthy and speedy crab fattening.
1. Select the Appropriate Crab Species and Size
Not all crabs are suitable for fattening. Astro Aquaculture suggests taking hard-shelled healthy male or female mud crabs with soft or semi-soft shells and 300 to 500 grams body weight. Such crabs are usually in pre-molting condition and will respond favorably to intensive fattening programs.
2. Select an Appropriate Fatting System: Cage, Pen, or Pond
Astro Aquaculture accommodates flexible arrangements like cage culture (in estuaries), pen culture (in tidal areas), and pond systems depending on the farmer's resources and location. For quicker yields, small-scale cage systems with ...
... individual compartments minimize fighting and cannibalism, ensuring stress-free growth.
3. Use Protein-Rich and Balanced Feed
Feeding is the foundation of crab fattening. Crabs need a protein-rich diet to gain weight quickly. Astro Aquaculture suggests using:

Small marine fish or trash fish
Snails or clams
Formulated crab feed with minimum 40% protein

Feed twice a day—early morning and evening—when crabs are active.
4. Optimize Water Quality for Healthy Growth
Deterioration in water quality is a common reason for sluggish growth and illness in crabs. Astro Aquaculture stresses:

Salinity: 15–25 ppt
Temperature: 26–32°C
pH: 7.5–8.5
Dissolved oxygen: > 4 ppm

Daily water exchange (a minimum of 20–30% every week) and aeration, particularly in closed systems, maintain optimal conditions for speedy fattening.

5. Monitor Molting Behavior Closely
Crabs gain substantial weight post-molting. Astro Aquaculture advises farmers to monitor molting indicators—like decreased activity and pale shell color—and provide isolation to crabs during this time to avoid other crab attacks.
6. Prevent Cannibalism and Aggression
Crabs are territorial and will hurt one another if housed in small or mixed tanks. Provide individual compartments, feed well, and avoid crowding. Astro Aquaculture also suggests removing aggressive or injured crabs right away to safeguard the group.
7. Use Supplements to Enhance Shell Quality and Growth
Mineral and vitamin supplements can accelerate fattening and improve shell hardening. Astro Aquaculture offers organic additives that help with calcium absorption, digestion, and immunity for faster turnaround.

8. Harvest at the Right Time
The optimum fattening period is 15 to 25 days, depending on the initial condition and growth rate of the crab. Crabs must be picked when the shell is hard and full, and they have decreased appetite—a sign of full maturity.
Conclusion: Smart Fattening Means Faster Profits
Crab fattening is more than feeding—its strategy, care, and consistency. The proper species, feeding schedule, environment, and health checks are key, with coastal area farmers able to grow faster cycles and increased profits. Astro Aquaculture continues its focus on educating farmers with functional advice, forward-thinking products, and sustainable methodology to succeed in the rapidly developing crab market.
Want to begin or grow your crab fattening operation? Call Astro Aquaculture for professional solutions and tested systems that really work.

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