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Allometric growth pattern of the swordtail - Xiphophorus helleri (Cyprinodontiformes, Poeciliidae) during early development
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Allometric growth pattern of the swordtail - Xiphophorus helleri (Cyprinodontiformes, Poeciliidae) during early development
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Journal Article
Allometric growth pattern of the swordtail - Xiphophorus helleri (Cyprinodontiformes, Poeciliidae) during early development
2015
Overview
This study was conducted to survey the allometric growth pattern of the swordtail (Xiphophorus helleri) during early developmental stage under rearing conditions. For this purpose, the fries were sampled after birth up to 60 day after birth (DAB), their left sides were photographed and morphometric parameters, including total length, head length, tail length, trunk length, eye diameter, snout length, and body depth were measured. The newly hatched fries were 8.3 ± 0.431 and 12.58 ± 0.234 mm in TL on 1 and 60 DAB, respectively. The results revealed growth priorities of this species during the early developmental stages. Based on the results, this species born with developed jaws and eyes that capable them to take the food immediately after birth and increasing the size of the mouth afterward to take larger food item. The inflection points of the most body segments are occurred during 30-35 days after birth showing a late morphological change in compare to oviparous species. These morphological changes are associated to head and snout lengths may be related to changing in feeding habit of this species. In addition, positive growth pattern of tail length is occurred earlier on 7 DAB improving its swimming capability to avoid predators and catch preys.
