Mathew, Grace and Sanil, N K and Sridhar, N and Leelabhai, K S and Khambadkar, L R and Palaniswamy, N (2002) Experiments on broodstock development and spawning of Epinephelus tauvina (Forskal). Indian Journal of Fisheries, 49 (2). pp. 135-140.
The present paper reports on broodstock development and spawning of the greasy grouper Epinephelus tauvina in indoor 5 ton capacity FRP tanks in recirculating sea water system, under controlled conditions. The broodstock was developed in the culture system by rearing the wild fingerlings, caught in the size range 90 to 200mm. After attaining maturity, the fishes were fed with supplementary diet for developing them into mature females. Simultaneously, a few were administered the male hormone methyltestosterone (MT) for sex inversion to males. Mature spermiating males were developed by this technique. A mature female fish weighing 3.85 kg and a single spermiating male weighing 3.25 kg have spawned spontaneously in the same indoor tank consecutively for two days from 29-10-1998 to 30-10-1998 and also from 20-12-’98 to 23-12-’98, producing approximately 2,50,000 eggs in each spawning. On both the occasions, the same hormonally sex inverted male has spermiated. Fertilization rate was over 90%. Eggs measured 0.920 mm with a single oil globule. The eggs hatched out at 23 hours. Hatching rate observed in the first spawning was 60% and in the second instance, 45%. Newly hatched larvae measured 1.74mm. After 68 hours the larval mouth has opened and feeding has started.
|Uncontrolled Keywords:||broodstock development; spawning; Epinaephelus tauvina|
|Subjects:||Aquaculture > Mariculture|
|Divisions:||CMFRI-Cochin > Marine Capture > Demersal Fisheries|
|Deposited By:||Dr. V Mohan|
|Deposited On:||10 Mar 2010 14:01|
|Last Modified:||26 Jun 2010 11:31|
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