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Larval development of the Pacific Sandperch (Prolatilus jugularis) (Pisces: Pinguipedidae) from the Independencia Bight, Pisco, Peru

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Citation:
Velez, J. , Watson, W. and Sandknop, E. (2003): Larval development of the Pacific Sandperch (Prolatilus jugularis) (Pisces: Pinguipedidae) from the Independencia Bight, Pisco, Peru , 27th Annual Larval Fish Conference, Santa Cruz, California USA August 20-23 .
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Abstract:

Morphological development of larval Prolatilus jugularis from Bahia Independencia, Pisco, Peru is described. 232 specimens were collected with plankton nets in 2000; a developmental series of 40 individuals (2.525.9 mm: recently hatched through transformation) was assembled using morphological features and pigmentation. Prolatilus jugularis hatches at approximately 2.5 mm, notochord flexion begins at ca. 5.7 mm and ends at ca. 6.9 mm, and transformation begins at an unknown size between 14.220.3 mm (probably near 20 mm). Diagnostic features of the larvae include a robust body with large head bearing small preopercular spines that begin to form by late preflexion stage; preanal length just under half of body length early in the preflexion stage increasing to near two-thirds of body length in the postflexion stage; and pigmentation primarily on the snout, opercular region, dorsally on the head and gut, laterally above the hindgut, and on the ventral margin of the tail through early flexion stage. A broad mid-lateral stripe begins to form on the trunk and tail late in the flexion stage and dorsal pigmentation forms on the trunk and tail in the postflexion stage. Pectoral-fin rays are first to begin forming, in mid-preflexion stage, followed by principal caudal-fin rays, then by pelvic-, dorsal- and anal-fin rays which apparently begin to form simultaneously near the end of preflexion stage. The dorsal fin is long and continuous, with IIIIV short spines and 2729 soft rays, the anal fin contains 2123 rays, the first one or two of which may be spine-like, the pelvic fins, with I,5 rays, are below or slightly in front of the pectorals (1820 rays), and there are 9+8 principal caudal-fin rays and 3637 myomeres.

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