Effect of eye-stalk ablation and maturation and spawning of female Penaeus monodon Fabricius, and hatching of the resulting eggs.
1989
Palanisamy V. | Faazaz Abdul Latiff | Othman Muhamad
A total of 113 non-gravid females of Penaeus monodon of weight range 120-300 g, obtained from the wild (87 females) as well as the pond (26 females), were subjected to eye-stalk ablation in order to induce maturation. Of these, 35.4 percent of the wild and 0.04 percent of the pond broodstock matured. Maximum number of spawning sequences was 5, with gonadal maturation latency period ranging from 3 days to 43 days from the day of eye-stalk ablation. Average number of eggs per spawning according to the 5 spawning sequence were 534,900, 524,100, 504,500, 814,500 and 813,000 with 51 percent, 42 percent, 39 percent, 40 percent and 20 percent as their respective fecundation rates. Average number of nauplii per spawning were 218,500, 275,300, 211,200, 148,600 and 185,000 with 41 percent, 51 percent, 32 percent, 19 percent and 45 percent as their respective hatching rates. Although the number of eggs produced by a female ranged from 860,200 to 4,152,000, the average was 641,900 eggs with an overall fecundation of 24 percent. The hatching of eggs per female ranged from 422,300 to 2,037,000 the average hatching rate being 22 percent. The eye-stalk ablation technique could ensure round-the-year operation of the hatchery without any dependency on the uncertain supply of gravid broodstock from the wild.
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