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Abstract
SUMMARY
This experimental work was undertaken at laboratory of breeding and production of fish, Animal and Fish Production Department, Faculty of Agriculture (Saba.Bacha), Alexandria University and Nucleic Acid Research Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), Mubark City for Scientific Researches and Technology Applications, Alexandria, Egypt.
This study involves geographical, morphometric, meristic, flesh quality and genetic differentiation among four Nile tilapia populations collected from local habitats.
The aim of this work was to document at the morphometric and meristic data, flesh quality and DNA fingerprint among Nile tilapia (Oreochromis niloticus) populations collected from Cultured, Edku Lake, River Nile and Manzalah Lake.
The results were summarized and discussed in the following points:
1. Insignificant differences in length, weight and condition factor were detected among Nile tilapia O. niloticus population from Cultured, Edku Lake, River Nile and Manzalah Lake.
2. The highest mean of body depth index was obtained by O. niloticus population collected from Edku Lake and differed significantly (P ≤ 0.05) from those of the other populations tested.
3. The highest mean of body width index value was 0.181±0.01 and recorded by O. niloticus population collected from Manzalah Lake, but did not differ significantly (P ≤ 0.05) from that of O. niloticus population collected from Lake Edku.
4. The highest mean of trunk length index was 0.603±0.04 was achieved by Cultured population and differ significantly (P ≤ 0.05) from those of the other population under study.
5. The highest mean of caudal peduncle length index value was recorded by River Nile population, but did not differ significantly (P ≤ 0.05) from that of Cultured population.
6. The highest mean of depth of caudal peduncle value index was 0.161±0.01 and recorded by Nile River population, which was significantly (P ≤ 0.05) higher than those of other Nile tilapia population.
7. The highest mean of width of caudal peduncle index was achieved by Nile River population (0.062±0.01), but did not differ significantly (P ≤ 0.05) from that of O. niloticus population collected from Manzalah Lake.
8. The highest mean of head length index was recorded for River Nile population (0.346±0.01), but did not differ significantly (P ≤ 0.05) from that of Manzalah population.
9. The highest mean of head width index (0.573±0.01 and 0.573±0.05) were achieved by Edku and Manzalah populations, respectively, which were significantly (P ≤ 0.05) higher than those of the other populations under study.
10. The highest eye diameter index mean of (0.284±0.03 and 0.284±0.04) were obtained
by Cultured and Edku populations, respectively, and differ significantly (P ≤ 0.05)
from those of the other populations studied.
11. The lowest mean of pre.orbital length index value (0.327±0.02) was obtained by
Manzalah population and differ significantly (P ≤ 0.05) from those of other
populations tested.
12. The highest mean of post.orbital length index value (0.495±0.03) was achieved by
Manzalah population but dif not differ significantly (P ≤ 0.05) from that of Edku
population.
13. Insignificant differences in caudal fin length index were detected among different O. niloticus populations tested.
14. The highest mean of longest dorsal fin ray index value of 0.268±0.03 was obtained by
River Nile population, but did not differ significantly (P ≤ 0.05) from that of Edku
population.
15. Last dorsal fin ray index significantly increased (P ≤ 0.05) by River Nile population
showing higher mean (0.085±0.01) compared with the other Nile tilapia populations
tested.
16. The highest mean of longest dorsal fin spine index value of 0.153±0.01 was achieved
by Manzalah population, showing significantly (P ≤ 0.05) increased compared with the
other populations tested.
17. The highest mean of last dorsal fin spine index value of 0.153±0.01 was obtained by
Manzalah population and differ significantly (P ≤ 0.05) than those of the other
populations tested.
18. The highest mean of dorsal fin length base index value of 0.626±0.02 was recoded by
Edku population, but did not differ significantly (P ≤ 0.05) from that of River Nile
population.
19. Pelvic fin length index of Manzalah Lake population showing higher mean
(0.314±0.03) and significantly (P ≤ 0.05) increased than those of the other populations
under study.
20. The highest mean of pelvic fin length base index value of 0.066±0.01 was achieved by
Edku Lake population and significantly increased (P ≤ 0.05) than those of the other
populations under study.
21. The highest mean of longest anal fin ray index value was obtained by Edku Lake
population, showing significantly (P ≤ 0.05) increase than those of the other
populations tested.
22. Insignificant differences (P ≤ 0.05) was detected in last anal fin ray among populations
under study.
23. The highest mean of longest anal fin spine index value (0.149±0.01) was recorded by
Manzalah Lake population, but differ significantly (P ≤ 0.05) from that of Edku Lake
population.
24. The longest anal fin spine index was the same as last anal fin spine index.
25. The highest mean of anal fin length base index value was recorded by Edku Lake
population (0.203±0.02), but did not differ significantly (P ≤ 0.05) from that of River
Nile population.
26. Pectoral fin length mean index value showing higher mean (0.398±0.02) by Nile River
population, but did not differ significantly (P ≤ 0.05) from that of Manzalah Lake
population.
27. The highest mean of pectoral fin length base index value of (Pect.FLbase/StL) was
recorded by Edku Lake and Nile River populations (0.075±0.01), showing
significantly increase (P ≤ 0.05) than those of Cultured and Manzalah Lake
populations.