Wei C.-J.,CAS Wuhan Institute of Hydrobiology |
Wei C.-J.,University of Chinese Academy of Sciences |
Shen Z.-X.,Fishery Environmental Monitoring Station of Qinghai Province |
Jia Y.-T.,CAS Wuhan Institute of Hydrobiology |
And 2 more authors.
Chinese Journal of Ecology | Year: 2015
The ability of precisely determining the age of fish is essential for surveying fish ecological traits and fish conservation. In this study, we compared the readability and consistency of age readings, which obtained from three calcified structures (otolith, dorsal spine and anal scale) of Gymnocypris eckloni from the upper reaches of the Yellow River, China, and established a discrimination equation to age the low-age individuals. The readability ranked in a descending order of otoliths > dorsal spines > anal scales. The maximum ages assigned by the oto-lith, dorsal spine and anal scale were 25, 17 and 16, respectively. Results indicated that dorsal spine was optimal for the individuals aged 6 or less, while otolith was the most suitable structure for those aged 7 or greater. All the samples aged 6 or less were clustered by total length, weight, length and somatic weight. With stepwise discriminant analysis method, total length and weight with significant discrimination ability were selected to establish a discriminant function. The statistical results showed that 88.90% of original grouped cases were correctly classified, and 88.40% of cross-validated grouped cases were correctly classified, indicating that G. eckloni aged 6 or less could be directly aged by discriminant analysis of total length and weight, with total length ranging from 93 to 259 mm and weight ranging from 6.25 to 177.10 g. © 2015, Editorial Board of Chinese Journal of Ecology. All rights reserved.
Qi D.,Qinghai University |
Chao Y.,Qinghai University |
Zhao L.,Qinghai University |
Shen Z.,Fishery Environmental Monitoring Station of Qinghai Province |
Wang G.,Fishery Environmental Monitoring Station of Qinghai Province
Mitochondrial DNA | Year: 2013
The complete mitochondrial genome for Gymnocypris eckloni and Gymnocypris przewalskii ganzihonensis is 16,686 and 16,682 bp in size, respectively. Both of the mitochondrial genomes have identical genomic organization and structure including 13 protein-coding genes (PCGs), 22 tRNA genes, 2 rRNA genes and 1 control region as found in other vertebrates, with the exception of 86 bp non-coding nucleotides between tRNAThr and tRNAPro. The phylogenetic analyses based on the concatenated nucleotide sequence of 12 PCGs on the heavy strand supported a relatively closed relationship among G. eckloni, G. p. przewalskii and G. p. ganzihonensis. The sequence divergence between G. eckloni and G. przewalskii, as well as within G. przewalskii, is relatively low compared to the average sequence divergence among other cyprinid fishes, suggesting that they are the most closely related species resulted from a relatively recent speciation event. The estimated molecular divergence time is coincided with a relatively recent speciation event occurring during the separation of the Yellow River and Qinghai Lake. © 2013 Informa UK, Ltd.