Length, weight and condition factor in 361 Fish individuals of Thunnus tonngol were determined between (Oct. 2007 to Sept. 2008)
from Karachi coast of Pakistan. Results showed highest mean length of fish of 38.3+0.079 cm in winter season and lowest of
22.27+0.17 cm in autumn. The Highest and mean weights of 416.4 12.19 and 114.79 + 2.29g, respectively, were recorded in
autumn. The condition factor (K) averaged to 0.941 0.006. The mean condition factor was highest in autumn (1.06+ 0.07) and the
lowest in winter (0.48+0.09). The seasonal distribution of various size classes of the fish catch is followed
