Cite this paper:
Jianzhong GUO, Dan LIU, Chi ZHANG, Yongjun TIAN, Zhixin LI. Using statolith shape analysis to identify five commercial Loliginidae squid species in Chinese waters[J]. Journal of Oceanology and Limnology, 2021, 39(3): 1160-1168

Using statolith shape analysis to identify five commercial Loliginidae squid species in Chinese waters

Jianzhong GUO1, Dan LIU1, Chi ZHANG1, Yongjun TIAN1,2,3, Zhixin LI1
1 Fisheries College, Ocean University of China, Qingdao 266003, China;
2 Frontiers Science Center for Deep Ocean Multispheres and Earth System(FDOMES), Ocean University of China, Qingdao 266100, China;
3 Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
Identification of squids in the family Loliginidae is a time-consuming exercise because of the highly overlapping distributions of species and their overall similarity (fin shape and size, sucker ring dentition, and color). Identifying squid based on statolith morphology is considered more accurate than identifying species based on beaks or gladius morphology. We report and compare the statolith shape of five commercially Loliginidae squid (Uroteuthis (Photololigo) duvaucelii, U. edulis, U. chinensis, Loliolus beka, L. japonica) to determine how well these structures discriminate species. Based on statolith morphology, variation in the lateral and dorsal domes enables an 84.8% success rate at classifying species. Environmental factors correlate with statolith shape, and for vertically migrating squid, statolith relative size decreases with increased depth of habitation. Statolith morphology can be used to effectively and accurately identify species of Loliginidae squid occurring in Chinese waters, and may prove valuable for identifying and managing squid resources.
Key words:    statolith shape analysis|Loliginidae squid|fishery management|Chinese waters   
Received: 2020-03-30   Revised: 2020-05-25
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