Development of Larvae and Juveniles of the Alfonsins, Beryx Splendens and B. Decadactylus (Berycidae, Beryciformes)
Abstract:The larval development of the alfonsins, Beryx spp., is described from specimens collected from the central North Pacific Ocean (29°N, 179°E) during July 1984, primarily in the upper 50 m. Yolk-sac larvae, 1.5–3.0 mm standard length (SL), have pigment at the forebrain and midbrain, the anterior end of the oil globule, over the intestine above the anus, and around the tip of the notochord. Pelvic buds form at 1.5–3.0 mm SL; flexion occurs between 3.7 and 6.0 mm SL. Fin ray formation is complete and scales are formed by 15 mm SL. Characters useful for identifying Beryx larvae include very elongate, early forming pelvic rays and anterior dorsal spines; a slightly S-shaped intestine about half the standard length; and sparse pigment restricted to internal pigment at the gas bladder, over the posterior intestine, and a spot located asymmetrically on the forebrain. Spines on the first lower infraorbital, characteristic of adult Beryx, develop at 3.8–4.5 mm SL. Juvenile B. splendens and B. decadactylus, from the North Atlantic, differ from each other in dorsal fin ray count.
Document Type: Research Article
Publication date: March 1, 1990
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