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- Title
Conditioning, maturation and year-round natural spawning of orange-spotted grouper, Epinephelus coioides (Hamilton, 1822), in recirculating aquaculture system.
- Authors
Ranjan, Ritesh; Megarajan, Sekar; Xavier, Biji; Dash, Biswajit; Ghosh, Shubhadeep; Menon, Muktha; Edward, Loveson L
- Abstract
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.
- Subjects
GROUPERS; EPINEPHELUS; FISH spawning; FISH reproduction; AQUACULTURE; FISH development; FISH stocking; ANIMAL behavior; BEHAVIOR
- Publication
Aquaculture Research, 2017, Vol 48, Issue 12, p5864
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1111/are.13409