Asian-Pacific Aquaculture 2019

June 19 - 21, 2019

Chennai Tamil Nadu - India

FIRST PRODUCTION OF SILVER MOONY Monodactylus argenteus IN CAPTIVITY AS A NOVEL CANDIDATE SPECIES FOR BRACKISH WATER AQUARICULTURE

Dani Thomas*, Rekha M.U., Raymond J. A., Krishna Sukumaran,  Kailasam M., Vijayan K. K.
 ICAR-Central Institute of Brackishwater Aquaculture, Chennai-600028, Tamil Nadu
Email: danithomass@gmail.com
 

Silver moony, Monodactylus argenteus (Linnaeus, 1758) belonging to the family Monodactylidae (order: Perciformes) is a species of high demand in the international ornamental fish industry. The present study gives details of captive broodstock maturation, induced breeding and larval rearing of silver moony for the first time. Sub-adults of silver moony collected from Vennangupattu backwaters, Tamil Nadu, India (n=200 avg weight, 50 ± 7g) were maintained in fixed cages (pvc mesh cages, 2x1x1m, 20mm) in pond system at Muttukadu Experimental Station, ICAR-CIBA at a stocking density of 20 per cage and fed with formulated broodstock feed (2mm, CP: 52%, CL: 10%) and Artemia biomass at for 10 months and monitored for captive maturity. The reproductive period based on the number of milting males and vitellogenic females was from February-March, the peak reproductive maturity was observed in February. Breeding system consisted on FRP tanks, capacity 500 l (salinity 31ppt, temperature 280C, ) provided with hide outs. Female with oocyte diameter > 500 μm and males with oozing milt were selected to maintain a sex ratio of, male: female; 2: 1 in the breeding tank. Hormonal induction for breeding was done using LHRHa. Spontaneous spawning and fertilisation was observed after 36 h of hormone administration.  A total of 4040 were spawned and the fertilization rate was estimated with 75%. The fertilized eggs were transparent, pelagic, non-adhesive with single oil globule, egg diameter, 860 ± 14.11 μm, oil globule, 233 ± 6.31 μm. Incubation was done in 200 l black, cylindroconical tanks. Incubation period was observed to be 18 h and the hatching percentage was 90%. Newly hatched larvae were, 1.60-1.67 mm. Larvae were stocked at 5 no l-1 in 500 l FRP tanks, initial mouth opening and complete yolk absorption was observed at 48 h and 96 h respectively. Larval rearing was conducted using live feeds; rotifer, copepods and Artemia nauplii; phytoplankton concentrations, Nanochloropsis occulata was maintained at 100-200 x 103 cell ml-. After 20 days post hatch the larvae reached the average size of 8.35 mm (7.6 to 9.1 mm). Percentage of survival was 42%.  Development of seed production of silver moony will pave way for transition of ornamental fish trade of this species from that based on exploitation of wild caught stocks to sustainable captive seed production systems.