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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 31, No. 2, 2010, pp. 169-176
Bioline Code: zr10025
Full paper language: English
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 31, No. 2, 2010, pp. 169-176

 en Ontogenetic Changes in Meristic Measurements of Silver Carp and Bighead Carp
Yu, Hong-Xia; Tang, Wen-Qiao & Li, Si-Fa

Abstract

The study analyzed 30 exterior meristic characters for 255 silver and bighead carp samples of 1- to 5-year-old collected from the National Primary Breeding Farm at Laojianghe Lake at the Middle Reach of the Yangtze River. Multivariate analysis was performed. In silver carp, the Euclidean distance was the greatest between the 1-year-old group and other age groups. Silver carp individuals were correctly classified at 98.0% accuracy with a discriminant function established by discriminant analysis based on meristic measurements. Similarly, bighead carp had the greatest distance between 1- to 2-year-old group and other age groups. Individuals of bighead carp were correctly classified at 90.7% accuracy by the discrimination function. The data showed that morphological transformation occurred during the life history of silver and bighead carp development. Eighteen meristic measurements showed highly significant differences, while four showed a significant difference between the two silver carp groups. Ten parameters decreased, while twelve measurements increased during development. In bighead carp, fourteen parameters were significantly different, while three parameters were significantly different between the two groups. Twelve parameters were significantly decreased and another five were increased during development. The results suggest allometric growth should be taken into account when identifying species, analyzing population differences and establishing germplasm standards based on morphology.

Keywords
Hypophthalmichthys molitrix; Aristichthys nobilis; Ontogeny; Morphology; Allometric growth; Yangtze River

 
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