Ommastrephes bartramii (Lesueur, 1821) is a widely distributed oceanic ommastrephid species throughout the subtropical and temperate waters of both northern and southern hemisphere and excluded from the equatorial waters of all three oceans' and forms a major fishery in the Japanese squid fisheries in the Pacific Ocean2. This species is reported to be inhabiting up to a depth of 1500 m and prefer to stay at a water temperature not below than 10° C3. 0. bartramii is distributed between 20° S and 40° S in the southern part of the Indian Ocean. This species attains over 50 cm mantle length (ML) and carries out extensive seasonal migrations between subarctic and subtropical waters, the area where they spawn4. The growth pattern of these species has been studied using length-weight frequency distributions and tagging techniques5. The cephalopods are fast growing mollusks and the growth rate is greatly influenced by the biotic and abiotic factors6. The length-weight relationships are used for estimating the weight from length of fish or vice versa and also can indicate the taxonomic differences and events in the life history of fish'. The statistical analysis of
morphometric characters gives a better idea for understanding the relationship between the species and to compare same species in different geographical areas'. The study of the individual growth pattern gives an insight about the population dynamics of the species such as growth and mortality rates which are commonly used for the stock assessments and life history studies. There is not much information available on the length-weight relationship of 0. bartramii from Southern Ocean waters. The length-weight relation of the neon flying squid 0. bartramii is discussed in this paper.