INVESTIGATION OF THE EFFECT OF WATER QUALITY ON SEED PRODUCTION IN TWO TILAPIA HATCHERIES IN EGYPT | ||||
| Journal of the Egyptian Veterinary Medical Association | ||||
| Volume 77, Issue 4, December 2017, Page 741-749 PDF (356.79 K) | ||||
| Document Type: Original Research Articles | ||||
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| Abstract | ||||
| A field study was conducted in two tilapia hatcheries, hatchery (A) located at El Fayoum Governorate and hatchery (B) located in Sharkeya Governorate, to investigate the effect of water quality on seed production. Eighty-four water samples were collected from the inlet, outlet, broodstock ponds, egg funnels and nursery ponds for determination of physico-chemical condition and microbial count of water used for incubating eggs and nursing frys. Fry and eggs samples were also examined for microbial loads. Results indicated that there was no significant difference between both hatcheries with respect to microbial of water samples, fry and eggs, although they were slightly higher in hatchery (B) than hatchery (A). Temperature (Temp.) and pH were not significantly different among water samples from both hatcheries. Dissolved oxygen (DO) and nitrite were significantly different for water samples used for incubating eggs between both hatcheries with means of (5.11 ± 0.305), (5.08 ± .44) mg/dl, respectively and (0.06 ± 0.03), (0.09 ± 0.06) mg/dl, respectively. DO and nitrite were also significantly different between both hatcheries for water used for rearing fry with means of (4.84 ± 0.24), (5.11 ± 0.47) mg/dl, respectively and (0.08 ± 0.05) and (0.11 ± 0.10) mg/dl, respectively. Ammonia showed significant different between both hatcheries for water samples used for incubating eggs with means of (0.23 ± 0.09) and (0.72 ± 0.35) mg/dl, respectively, on the other hand ammonia in water samples used for rearing fry were not significantly different between both hatcheries. The low level of difference in both microbiological and physical-chemical parameters between the two hatcheries leads to similar fertility percentage (95% and 96% for hatchery (B) and hatchery (A), respectively), hatchability percentage (90% and 91% for the hatchery (B) and hatchery (A), respectively) and mortality percentage (10% and 9% for hatchery (B) and hatchery (A), respectively). The better performance of hatchery (A) may be due to better sanitary measurements adopted.: | ||||
| Keywords | ||||
| Hatcheries; fry and eggs; water quality; microbial counts | ||||
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