التفاصيل البيبلوغرافية
| العنوان: |
Age and growth of a cichlid fish, Tilapia zilli in Lake Qarun, Egypt. |
| المؤلفون: |
Azab, Ahmad M., Abu-Zaid, Mohamed M., Ghanem, Mohamed H., El-Tabakh, Mohamed A. |
| المصدر: |
International Journal of Development; 2015, Vol. 4 Issue 1, p77-90, 14p |
| مصطلحات موضوعية: |
CICHLIDS, FISH development, LAKES, STATISTICAL correlation, TILAPIA zillii |
| مصطلحات جغرافية: |
EGYPT |
| مستخلص: |
The present study provided information on length-weight relationship and condition factors of Tilapia zilli at Lake Qarun, Egypt during the period from July, 2012 to April, 2013. Results showed that, the total length of T. zillii varies from 5 to 17 cm, while the total weight was ranged between 2.64 and 96.01 g. The weight of the fish increases with the increasing in length. The "b" value (2.95) is around the ideal (3), indicating a tendency towards isometric growth. The correlation coefficient "r" was 0.95, which is statistically highly significant. The exponent "b" in the case of males (2.97) is higher than that of females (2.89), indicating the better condition of males than females of this fish. Data revealed that, the composite coefficient "k" and the relative condition factor "kn" was varied significantly with the fish size. Small fish had the lowest values of condition factors. Both "k" and "kn" exhibited specific fluctuation in both sexes during the different months of the years. The longevity of Tilapia zilli was estimated to be 7 years. The abundance of age groups greatly fluctuated during the different months of the year; but fishes belonging to age groups 3+ and 4+ were the most abundant groups, constituting 55.65% of the total fishes. The annual increment in length was inversely proportion with the total fish length. While, the annual increment in weight was directly proportion with the total fish weight. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
