An attempt is made to establish the depth specific variations in the length-weight relationships of ten species of deep-sea fishes inhabiting different depth zones along the southwest coast of India. The regression coefficients worked out for 10 species were compared using ANACOVA. The results revealed that both slope and elevation were significantly different in five species viz. Psenopsis cyanea, Neoepinnula orientalis, Hoplostethus mediterraneus. Priacanthus hamrur and Cubiceps caeruleus and pair wise comparisons of slopes showed significant difference both depth wise and sex wise in these fishes. On the contrary, no statistically significant difference was noticed in five other species.

Length-weight relationship, deep-sea fishes, depth specific variation