VOLPEDO Alejandra Vanina
Primera cita para Melanocetus johnsoni Gunther, 1864 en aguas del Mar Argentino (Ceratioidei: Melanocetidae).
VOLPEDO, A.V; ECHEVERRÍA, D.D; GARCIA, N; CRESPO, E
Sociedad Zoológica del Plata
Lugar: La Plata, Buenos Aires; Año: 1998 vol. 44 p. 117 - 118
The aim objective of this note is to communicate the record of a specimen of Melanocetus jhonsoni in waters of the Argentine shelf, along with some characteristics of the external morphology. It was caught by the fishing vessel Other, to the southeast of Isla de los Estados (55°05´S; 63°0W) in February, 1995. The specimen was caught in a mid-water trawl for Patagonian grenadier (Macruronus magellanicus, Lonnberg, 1907) and southern blue whiting (Micromesistius australis, Norman, 1937) at 700 m depth. The specimen was identified by means of the key for the family (Pietsch and Van Duzer ,1980), on the base of the following characters: number of teeth in the lower jaw (46), number of radials in the anal fin (4); pectoral fin (17); caudal fin (8). The dorsal fin is deteriorated but we registred 15 radials. Rate between the length of the lower jaw with respect to standard length (1,01%). The features are concordant with the description of Melanocetus johnsoni from Pacific Ocean waters reported by Kong and Melendez (1991). The specimen is a female. The scales are conic shaped, with a circularity base and the free edge oriented to the caudal region of the fish. The otoliths are hollow and transparent. Left otolith is described.