Podcast
Questions and Answers
What is the primary purpose of developing wild caught sub-adults of cobia into broodstock in sea cages?
What is the primary purpose of developing wild caught sub-adults of cobia into broodstock in sea cages?
How are gravid males and females identified in cobia?
How are gravid males and females identified in cobia?
What is the purpose of inducing spawning in cobia?
What is the purpose of inducing spawning in cobia?
What is the approximate number of eggs laid by a female cobia?
What is the approximate number of eggs laid by a female cobia?
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How are the eggs incubated in cobia production?
How are the eggs incubated in cobia production?
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What is the purpose of size grading in larval rearing?
What is the purpose of size grading in larval rearing?
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What is the duration of metamorphosis in cobia larvae?
What is the duration of metamorphosis in cobia larvae?
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Where is the breeding technology of cobia mainly confined to?
Where is the breeding technology of cobia mainly confined to?
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What type of feed is started from the 15th day in larval rearing?
What type of feed is started from the 15th day in larval rearing?
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Study Notes
Cobia Fish Characteristics
- Cobia is a high-value marine migratory pelagic finfish, distributed worldwide in tropical, subtropical, and warm-temperate waters.
Cobia Breeding and Spawning
- Wild caught sub-adults (5-6 kg) are developed into broodstock in sea cages.
- Gravid males and females are identified through cannulation and tagging since sexual dimorphism is not distinct in this species.
- Mature fishes (8-10 kg and above) with female intra-ovarian egg diameter above 700 μm are transferred to the spawning tank (>60 tonne capacity) for spawning induction with a female: male ratio of 1:2.
- Spawning is induced through a single injection of HCG (500 IU/kg body weight for female and 250 IU/kg body weight for males).
Egg Incubation and Larval Rearing
- Eggs (0.5-2.5 million) are incubated in 2 tonne capacity tanks at a stocking density of 200-500 eggs/litre, which hatch within 18-22 hours and develop to larvae in 60-72 hours.
- Larval rearing is carried out in 2-5 tonne capacity tanks at a stocking density of 5-10 nos/litre with mild aeration using the green water culture technique.
- Newly hatched larvae are fed on enriched rotifer, and inert feed is started from the 15th day and switched entirely to artificial feed from 20 days dph.
- Size grading is done every third day to avoid/reduce cannibalism.
Metamorphosis and Breeding Technology
- The metamorphosis of the larvae takes 18-21 days.
- The breeding technology is mainly confined to the states of Tamil Nadu, Andhra Pradesh, and Kerala.
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Description
Learn about the characteristics and breeding practices of cobia, a high-value marine fish species, including its distribution, mariculture, and reproductive biology.
