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Conditioning, maturation and year‐round natural spawning of orange‐spotted grouper, Epinephelus coioides (Hamilton, 1822), in recirculating aquaculture system

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Title Conditioning, maturation and year‐round natural spawning of orange‐spotted grouper, Epinephelus coioides (Hamilton, 1822), in recirculating aquaculture system
Not Available
 
Creator Edward,Loveson
Muktha,M
Ghosh,Shubhadeep
Dash,Biswajit
Xavier,Biji
Ranjan,Ritesh
Megarajan,Sekhar
 
Subject broodstock, Epinephelus coioides, grouper, recirculatory aquaculture system, spawning
 
Description Not Available
The present experiment was aimed at studying the conditioning, maturation and natural spawning of orange‐spotted grouper, Epinephelus coioides, in a recirculatory aquaculture system (RAS). Thirty fish (n = 30; 3.35 ± 0.05 kg) were stocked in a circular tank of 125 m3 capacity fitted with an RAS for conditioning and broodstock development. After 15 days, 15 fish were implanted with 17 α methyl testosterone and letrozole at the rate of 5 mg and 0.2 mg/kg body weight, respectively, for conversion from female to male. The gonadal development started after 1 month, and by 90th day, 63.53 ± 3.78% and 2.07 ± 0.84% of the oocytes attained a size of 400–500 μm and 500–600 μm respectively. Natural spawning commenced in the RAS from 4th month onward after stocking and spawning continued round the year. The spawning pair showed courtship behaviour with a typical vertical burst of swimming just before release of gametes. The total number of eggs spawned during 1 year was 47.23 million with spawning frequency varying form 5 to 13 times per month. The association of spawning events with new moon day (lunar cycle) weakened as time progressed. The mean monthly fertilization and hatching rates varied from 77.80 ± 3.34% to 83.70 ± 1.76% and 82.80 ± 4.21% to 88.33 ± 1.39% respectively. The study proved that RAS is an efficient system that provides a stable, controllable and conducive environment for year‐round natural breeding of orange‐spotted grouper.
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Date 2021-09-17T07:58:13Z
2021-09-17T07:58:13Z
2017
 
Type Article
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/63817
 
Language English
 
Relation Not Available
 
Publisher Not Available