OPTIMUM STOCKING SIZE OF POST-LARVAE FOR REARING MARINE SHRIMP, Penaeus semisulcatus, IN EARTHEN PONDS DURING WINTER AND SUMMER. | ||||
| Journal of Animal and Poultry Production | ||||
| Article 5, Volume 29, Issue 3, March 2004, Page 1125-1136 PDF (417.57 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2004.239140 | ||||
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| Authors | ||||
| M. M. Abdet-Rahim,1; A. M. Nour2; Eglal A. Omar3; M. A. Zaki2; T. M. Srour3 | ||||
| 1Marine Hatchery, K21, Alexandria, General Authority for Fish Resources Development, Egypt. | ||||
| 2Animal Production Dep., Faculty of Agriculture, EI Shatby, Alexandria Univ., Egypt. | ||||
| 3Animal and Fish Production Dep., Faculty of Agriculture, Saba Basha, Alexandria Univ., Egypt. | ||||
| Abstract | ||||
| The experiment was carried out in six earthen nurseries constructed inside greenhouses with a total area of each of them 300 m2 and the water area/earthen nursery was 250 m2 with an average depth of 80 cm. Each nursery was equipped with inlet and outlet pipes. Three stocking sizes, namely 0.8 (PL'.5). 1.3 (PL7.s) and 2.6 (PL,2.13) mglpce of shrimp. Penaeus semisu/catus, post-larvae (each in two replicates) were tested during two different seasons. winter (240 e) and summer (300 e) for 35 days. Post-larvae shrimp were fed on crumble feed containing 52 % protein at four meals /day (20 % of body weight). Water quality, survival, growth performance and feed conversion ratio (FeR) of the tested shrimp during both seasons were studied. The results showed that dissolved oxygen decreased significantly as stocking size and water temperature increased. Un- ionized ammonia increased significantly (P < 0.05) as stocking size and water temperature increased. Growth rates of the post-larvae were better during winter at high stoking sizes than at lower one. Whilst the opposite was observed during summer, with much better growth rates compared with those of winter for all tested sizes of shrimp. The respective FeR of shrimp were 2.24, 1.31 and 1.03 during winter and 2.82, 2.15 and 2.09 during summer, for 0.8. 1.3 and 2.6 mg/pce stocking sizes, respectively. with significant differences among stocking sizes and between seasons. Survival rates increased Significantly with increasing the stocking size but without significant difference between winter and summer. Finally, it could be concluded that the minimum ideal size of shrimp, P. semisu/catus to be stocked in earthen nursery or grow-out ponds is at least 1.3 mg/pce. | ||||
| Keywords | ||||
| Marine shrimp; Stocking size; Earthen nursery ponds; Seasons. Survival and Growth performance | ||||
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