Length-Weight Relationship and Seasonal Distribution of Magalaspis cordyla (Linnaeus 1758) fish Size Frequency Variation from Karachi Coast

The study of seasonal variation in distribution of 167 fishes of magalaspis cordyla from the Karachi fish harbour collected seasonally (pre-monsoon, mon-soon, post-monsoon) between September 2011-August 2012. The highest catch of fish (68) was recorded in pre-monsoon season and the lowest catch of fish (47) was recorded in monsoon season. The highest mean length (38.6+ 0.746) and weight (288+ 21.90) was measured during pre-monsoon season and lowest mean length (22.5+ 0.671) and weight (120.5+ 2.73) was measured during mon-soon season. The highest mean condition factor (1.192+ 0.817) and minimum (0.500+ 0.038) was recorded in pre-monsoon season. Fish estimated negative and positive allometric growth because b values larger and less then 3 in pre-monsoon and monsoon season but post-monsoon season showed positive allometric growth because b value larger then 3 in all size classe