Abstract
The presence of a larval period is characteristic of fishes with an indirect ontogeny. Many transformations involved in this period lead to the acquisition of biological and ecological characteristics of each species, that culminate in changes in distribution and feeding habits. Larval period includes four developmental stages: viteline larvae, pre-flexion larvae, flexion larvae and post-flexion larvae. Each developmental stage showed inherent characteristics associated with changes in priorities during growth. During the viteline larvaeand pre-flexion larval stages, priority is about increasing the survival possibility through an increase in the capacity of feeding and escaping predators which is reflected in the development of structures involved in these activities. The flexion larva is characterized by a greater degree of functionality of organs and structures previously developed. Finally, the post-flexion larvae show the most drastical changes in the functionality of developed organs. In this work, we present a description of the development of these organs, taking into account differences and similarities between species.
Highlights
The presence of a larval period is characteristic of fishes with an indirect ontogeny
In this work, we present a description of the development of these organs, taking into account differences and similarities between species
Aunque en especies como G. morhua se ha reportado que las pseudobranquias ya están completamente formadas y funcionales en el estadio de postflexión (Hunt von Herbing et al, 1996), en Dentex dentex, siguen su desarrollo en este estadio mostrando un incremento progresivo en número y longitud de sus filamentos hasta la transformación a juvenil (Santamaría et al, 2004)
Summary
The presence of a larval period is characteristic of fishes with an indirect ontogeny. La aparición de arcos branquiales y dientes faríngeos rudimentarios occurre entre los días 1 y 2 DE en P. californicus (Gisbert et al, 2004), en D. dentex se observan al día 3 DE, así como la presencia de células caliciformes (Santamaría et al, 2004); las cuales se encargan de secretar mucina para mantener húmedo el epitelio de recubrimiento del sistema digestivo, mientras que en P. maculatofasciatus aparecen al día 5 DE (Peña et al, 2003).
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