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Condition factor in fisheries is crucial as a quantitative parameter because the heavier the fish species of a given length, the better the physiological condition of the aquatic organism. They are also important tools used to obtain information on length frequency distribution, fish condition for stock assessment and management of the fish population. Length and weight data of fish are useful parameters in estimating the length and age structures, population dynamic, growth, mortality rates and well-being of the fish. In this regard, it is common to use measurements such as body-length, body depth, head length, eye diameter, jaw length of fishes etc, to not only assess the fish habitat peculiarities and ecological criteria in water bodies, but to also measure discreteness and relationships among various taxonomic categories. Apart from changes in these environmental characteristics, the morphometric characteristics are also used to assess growth fluctuation on fish populations. Introduction Fish, especially those in tropical and subtropical water system are known to experience growth fluctuations which are due to factors such as changes in environmental parameters and food composition. The result obtained in this study showed both negative and positive allometric growth pattern. The mean condition factor ranged from 1.818 and 2.351. The highest (3.512) and lowest (1.503) ' a ' value was recorded for Hemichromis fasciatus and Oreochromis niloticus respectively, while the ' b ' value ranged from 2.78 and 3.54.

The mean total length and weight were 15.76 cm and 78.39g respectively. Fish specimens were procured from middlemen at the landing site from January to June, 2014. The length-weight relationships of some economic freshwater fishes were analyzed in Nwaniba River, Southern Nigeria.

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