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¹ Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Colección Ictiológica. Avenida IPN s/n, Colonia Playa Palo de Santa Rita, La Paz, Baja California Sur 23096, México DOI : 10.4194/1303-2712-v18_8_09 Viewed : 4349 - Downloaded : 2694 Length-weight relationships (LWR) were estimated for five elasmobranch species found in the Eastern Pacific: Heterodontus francisci (Girard, 1855), Urobatis halleri (Copper, 1863), Urobatis maculatus (Garman, 1913), Diplobatis ommata (Jordan and Gilbert, 1890), and Rhinobatos productus (Ayres, 1854). Species were selected because none had previously published data on LWR. The specimens were sampled along the Pacific west coast of Mexico, including the Gulf of California, between June 2009 and May 2013, using different fishing gear. The values of the exponent `b` of the LWR ranged from 2.52 to 3.06. This study provides the first reference on the LWR for these elasmobranch species. Keywords : Length-weight, fisheries, sharks and rays, Eastern Pacific