LOPHIOSILURUS ALEXANDRI PDF

Lophiosilurus alexandri: MZUEL , 3, to mm SL, Estação de Piscicultura de Três Marias, CODEVASF, on the upper São Francisco. The “pacamã”, Lophiosilurus alexandri, is a particularly interesting case for addressing this problem. Lophiosilurus alexandri is the largest.

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The caudal fin in Lophiosilurus is formed and replaces part of the finfold during the postflexion stage. The greatest morphological changes in the development of L. Reevaluation of the caudal skeleton of certain actinopterygian fishes: The inclusion of the width and depth mean proportions obtained from juveniles and adults of other species of the family, shows a wide distribution of these species along the X axis body depthbut with a tendency to a narrower distribution on the Y axis body width.

Introduction The search for the morphological changes that gave rise to the present diversity of forms and taxa continues to be one of the main pophiosilurus of Evolutionary Biology. Outer mentonian barbels and maxillary barbels do not exceed the gill opening.

Lophiosilurus alexandri – Wikipedia

The maxillary barbel is also short in all other species of Pseudopimelodidae. Support Center Support Center. The more shallow bodied Cephalosilurus and Lophiosilurus are thereby derived and nested within the family.

Correlation analyses were carried out using Microsoft Excel, and box plot analysis using Past v.

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Mouth not formed soon after hatching; visible in subterminal position lophioailurus the first day of development. Description of eggs and larvae of jack mackerel Trachurus symmetricus and distribution and abundance of larvae in and In the phylogeny of Pseudopimelodidae proposed by Shibatta [ 9 ], L.

Lophiosilurus alexandri is the largest species of the family Pseudopimelodidae, reaching mm standard length [ 7 ] and 4 kg body mass [ 8 ]. Notochord visible by transparency with flexion in caudal region. Stage absent in L. Due to its excellent flavor and the lophilsilurus of its flesh [ 8 ], the species has good potential for intensive aquaculture.

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Dorsal region of skull with several ridges on day Maxillary barbel not reaching gill opening. The dorsalmost rays of the upper caudal-fin lobe are also longest in larvae of Batrochoglanis raninus [ 28 ], indicating that this condition may be also present in the remaining Pseudopimelodidae. Primordial dorsal, pectoral, anal and caudal fins aleandri incipient rays.

Juvenile period Stage observed from 49 to 60 days after hatching. Dorsal fin distinct in the early stage of lophiosklurus, and fully developed after day The caudal skeleton of the catfishes, order Siluriformes.

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Notochord straight, visible as transparency for entire length. Otic capsule with one semicircular canal visible, and two otholits. From the second day of development, barbels present.

Desenvolvimento inicial de Hoplias. Tip of inner mentonian barbel not surpassing posterior margin of eye Fig 5a.

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Accessed Dez Adipose-fin base elongate in specimens at 49, 52 and 56 days post-hatching. Primordial anal fin broadly rounded, visible as thick membrane included within in ventral finfold. The position of the mouth has also undergone major changes during the development of Lophiosilurus. The color pattern of most species of Pseudopimelodidae is formed by dark transverse bars on the body that is somewhat triangular, wide dorsally and tapered ventrally, and dark irregular blotches on the sides of head and body.

Besides these restrictions, Wayne [ 5 ] noted that the morphological diversity of adult forms of dogs and other domesticated animals depends on expressions during ontogeny. Dorsal lobe of caudal fin long, almost twice as long as ventral lobe.

The largest species of the family with mm SL, Lophiosilurus alexandriexperiences impressive changes in body shape during development, becoming extremely depressed when fully developed. Incipient caudal fin formed by finfold and confluent with dorsal and ventral portions of finfold; dorsal caudal-fin lobe more developed and slightly longer than ventral lobe, with 15 incipient rays visible in 4-day old specimens Fig 2a.