Bilogical studies of some fishes inhabiting Bitter Lakes & Lake Timsah

In the present study age growth and mortality of Terapon puta was estimated for 335 specimens collected by monthly sampling. This study was carried out from June 2012 to May 2013 in the Lake Timsah Egypt. The age of Terapon puta was estimated by examining scales and it was found out that the maximum age was three years. The main total length and total weight values were calculated as 10.73 ±1.04 cm. to 28.9±1.73 g. and the calculated length-weight relationships were W = 0.023425 L2.88. The von Bertalanffy growth parameters were L∞ = 17.18 cm. K = 0.2632 year-1 and to = -1.9363 year. The instantaneous rate of total mortality (Z) was 1.49882 the natural mortality (M) was 0.4322.and the fishing mortality (F) was estimated to be1.06662. The exploitation rate (E) was calculated as 0.71 using value of M and F. Therefore the population of Terapon puta off Lake Timsah was under the threat of over fishing.