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Morfología externa del desarrollo larvario de Hemicaranx amblyrhynchus (Pisces: Carangidae) del sur del Golfo de México

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Flores Coto, César
Sánchez Ramirez, Marina
Zavala García, Faustino

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Universidad de Costa Rica

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Larval development of Hemicaranx amblyrhynchus is described from wild specimens (standard length SL: 1.8-16.4 mm) caught in the southern Gulf of Mexico (N=25). A serrated occipital crest was present only in specimens smaller than 5.73 mm SL and a supraocular erest with a small spine in those between 4 and 5 mm. As in all larval carangids, the angle preopercle spine was conspicuous since tbe fírst stages. Suprac1eithral and posttemporal spines were present during flexion stage, and then disappeared in transformation stage. Body depth is moderate, increasing with development. The dorsal and anal fíns start to be evident in the 2.65 mm NL specimen; total number of spines and soft rays are almost complete around 9.0 mm SL. The pelvic bud was observed in tbe 3.16 mm LP specimens. From tbe early stages, the larvae are very pigmented and could be recognized by a pigmentation blotch on tbe tip of nose, which is conformed by palatine melanophores among others. Larvae of H. amblyrhynchus occurred scarcely in the area; they were essentially recorded on the inner shelf, in imrface waters, not deeper than 30 m. The present paper is the fírst larval record for the speeies in the southern Gulf of México.
Se describe el desarrollo larvario de Hemicaranx amblyrhynchus con especímenes capturados en el sur del Golfo de México. Los ejemplares presentaron tallás desde 1.87 mm hasta 16.43 mm. Los ejemplares más pequeños presentan una cresta supraoccipital aserrada que se distingue todavía en el espécimen de 5.7 mm de LP y desaparece en los de talla superior. El cuerpo es moderadamente alto en la preflexión y aumenta ligeramente durante el desarrollo. Las aletas dorsal y anal son visibles a partir del espécimen de 2.65 mm de LN; el número de espinas y radios está casi completo alrededor de los 9.0 mm LP. Las larvas de H. amblyrhynchus pueden reconocerse por una mancha de pigmentos en la punta del hocico, que está confonnada, entre otros, por melanóforos en el palatino.

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larval fishes, larval development, hemicaranx amblyrhynchus, gulf of Mexico

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