Reconstruction and Identification of Beak Morphology in Purpleback Flying Squid Sthenoeuthis oualaniensis
LI Qingying1, LIU Bilin1,2,3,4,5, OU Liguo1, GU Xinyu1, CHU Moxian1, BU Xinyu1
1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China; 2. The Key Laboratory of SustainableExploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China; 3. National Distant-Water Fisheries Engineering Research Center, Shanghai 201306, China; 4. Key Laboratory of OceanicFisheries Exploration, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China; 5. Scientific Observing andExperimental Station of Oceanic Fishery Resources, Ministry of Agriculture and Rural Affairs,Shanghai 201306, China
Abstract：Purpleback flying squid Sthenoeuthis oualaniensis is a kind of marine cephalopod with abundant resources. Understanding of the population structure of purpleback flying squid is beneficial to the evaluation and management of fishery resources. Beak as hard tissue is a good material for identifying the populations of purpleback flying squid, so 161 squid samples collected from the Middle East Pacific, northwest Indian Ocean and East Indian Ocean were used to analyze and distinguish the upper and lower beaks by Fourier transform. The three views of upper and lower beaks were transformed into 20 sets of elliptic Fourier descriptors by software. The three views of upper and lower beaks were reconstructed, and then principal component analysis and stepwise discriminant analysis were carried out. The results of principal component analysis showed that the first two principal components of elliptic Fourier descriptors explained 67.4%, 70.8%, 65.8%, 80.7%, 63.0% and 57.8% of the total variation for lateral, ventral and oral view of upper beak and lower beak, respectively; the results of discriminant analysis showed that the success rates of discriminant analysis were 87.0%, 82.6%, 83.2%, 85.7%, 88.8% and 72.0% respectively; the contour of the six views reconstructed by Fourier analysis reflected the differences among the populations of squid in the three sea areas. Therefore, it is suggested that the geographic population of purpleback flying squid can be identified by analyzing the contour morphology of the six views of the beaks with Fourier transform, and the correct rate of population identification can be improved by using three views.
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2023, Vol. 42 
