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| Morphometric Differences between Mandarinfish Siniperca chuatsi and Bigeye Mandarinfish S. kneri and their Intermediate Form in the Middle Reaches of the Changjiang River |
| ZHU Shuqin, ZHAO Jinliang, ZHOU Yunhong, WU Hongyan |
1. Laboratory of Freshwater Fisheries Germplasm Resource, Ministry of Agriculture and Rural Affairs, Shanghai OceanUniversity, Shanghai 201306, China;
2. Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding,Shanghai Ocean University, Shanghai 201306, China;
3. National Demonstration Center for Experimental FisheriesScience Education, Shanghai Ocean University, Shanghai 201306, China |
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Abstract In order to identify and distinguish the “intermediate form” samples collected from Poyang Lake and Dongting Lake, which have the characteristics of both mandarinfish Siniperca chuatsi and bigeye mandarinfish S. kneri, the countable characteristics(numbers of fins and gill rakes) and morphological framework characteristics of “intermediate form”, mandarinfish and bigeye mandarinfish were compared and determined, and analysis of variance, principal component analysis, discriminant analysis, and STRUCTURE cluster analysis were performed. The results showed that: (1) the intermediate form was between mandarinfish and bigeye mandarinfish, in terms of eye size, relative position of the posterior edge of the maxilla to the posterior edge of the eye, and the bulge degree of the head and back. (2) There were no significant differences in the countable traits (number of fin ray, and number of gill raker) between the intermediate form and mandarinfish and bigeye mandarinfish. (3) Analysis of variance showed that in quantitative traits, the difference between the intermediate form and mandarinfish and bigeye mandarinfish mainly lied on: the relative position of the maxillary bone to the eye, the eye diameter, the protruding degree of the head and back, and the length of the caudal peduncle; principal component analysis showed some frame traits of the back of the head and the anterior part of the back of the head and body height were the main components of morphometric difference between the intermediate form and mandarinfish and bigeye mandarinfish. The discriminant accuracy of mandarinfish, bigeye mandarinfish and intermediate form was 90%, 81.8% and 85.4%, respectively, with the average discriminatory accuracy of 85.6%. STRUCTURE cluster analysis showed that the morphometric characteristics of the intermediate form were between that of mandarinfish and bigeye mandarinfish, and inclined towards mandarinfish. The findings can provide some basic data for understanding of intraspecific variation or interspecific hybridization of mandarin fishes in the Changjiang River.
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Received: 30 December 2019
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