فهرست مطالب ghadir ghorbanzadeh

The early morphological development and allometric growth pattern of Caspian kutum (Rutilus frisii kutum) during early development (from 0-35 days post hatch=dph) was studied. Morphological data were obtained using ImageJ software from 2D pictures and allometric growth patterns were computed based on Log10 y = Log10 α βLog x function. Based on inflexion point of morphological traits and body shape changes, the early developmental of kutum were divided into Eleuthero-embryo, Propterygio-larval, Pterygio-larval” and younger juvenile phases, each of which included vital developmental events. Rapid and intense changes occurred during Eleuthero-embryo and Propterygio-larvae stages such as development of gills, depletion of yolk-sac and exogenous feeding, development of feeding apparatus, sense organs and organs related to swimming performance. The results also revealed that developmental changes occurred in agreement with the inflexion points of morphological characters and their developmental priority imply on functional importance of feeding, respiration and swimming related structures.

Early development and Allometric growth pattern is a common feature during early development of fish larvae. This research was conducted to investigate the allometric growth patterns and morphological development of the Green Terror (Aequiden srivulatus)¡ a valuable aquarium species¡ during early development up to 1266 hours post hatching (Hph). Hence¡ its morphological changes during its ontogeny were described. Morphometric data parameters were obtained from 2D pictures of specimens using the software ImageJ and allometric growth pattern was calculated as a power function of total length using non-transformed data: Y=axb. Results revealed that during early development after hatching¡ the allometric growth pattern of head¡ snout¡ eye diameter and tail regions were positive and they changed into isomertic pattern about 156-570 Hph¡ reflecting the dominance of life functions including swimming¡ respiration and sensory systems during this period. Results also showed that at these turning points the growth of most morphological features of body have been occurred along with exogenous feeding. Based on the finding of this study¡ early development of this species can be divided into four stages of Eleuthero-embryo (up to 120 Hph along with yolk sac absorption)¡ Propterygio-larval (156 Hph)¡ Pterygio-larval (570 Hph) and Juvenile.