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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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Relation http://eprints.cmfri.org.in/12686/
https://onlinelibrary.wiley.com/doi/epdf/10.1111/are.13409
https://doi.org/10.1111/are.13409
 
Title Conditioning, maturation and year‐round natural spawning of orange‐spotted grouper, Epinephelus coioides (Hamilton, 1822), in recirculating aquaculture system
 
Creator Ranjan, Ritesh
Megarajan, Sekhar
Xavier, Biji
Dash, Biswajit
Ghosh, Shubhadeep
Muktha, M
Edward, Loveson
 
Subject Aquaculture
Groupers
 
Description 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.
 
Date 2017
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/12686/1/Ritesh%20Ranjan_Muktha_2017_Aquaculture%20Research_Conditioning%2C%20maturation%20and%20year-round%20natural%20spawning.pdf
Ranjan, Ritesh and Megarajan, Sekhar and Xavier, Biji and Dash, Biswajit and Ghosh, Shubhadeep and Muktha, M and Edward, Loveson (2017) Conditioning, maturation and year‐round natural spawning of orange‐spotted grouper, Epinephelus coioides (Hamilton, 1822), in recirculating aquaculture system. Aquaculture Research, 48. pp. 5864-5873.