| Citation | El Zarka, S., 1961, Tilapia fisheries investigation in Egyptian lakes. I. Annulus formation on the scales of the cichlid fish Tilapia zillii (Gerv.) and its validity, in age and growth studies.. Notes Mem. UAR (South. Reg.) Minist. Agric. Hydrobiol. Dep. 62:1-18. |
| Ref. | 365 El Zarka, S., 1961 |
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| Named Used as Valid | Oreochromis niloticus niloticus |
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