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Microstructure comparison of hard tissues (statoliths, beaks, and eye lenses) of Uroteuthis chinensis in the South China Sea

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In this study, the microstructure features and the number of growth increments in the statoliths, beaks and eye lenses of the mitre squid Uroteuthis chinensis (Gray, 1849) were examined. Growth increments in three regions of the statolith [the dorsal dome (SDD), lateral dome (SLD) and rostrum] were observed; those of the SLD had the most stable increment widths. The SLD and SDD had a similar number of growth increments. Increment number in the rostrum sagittal section (RSS) of the upper beak was lower (about 30 increments) and that of the eye lens was many times higher (about 3 to 5 times) than those in the statolith and the beak. The best fits against mantle length were the number of growth increments of the beak (R2 = 0.76), SLD (R2 = 0.41 to 0.43) and eye lens (R2 = 0.36). The relationship between mantle length and growth increments of SLD could be described with two separate equations, possibly indicating that two different cohorts were sampled. Based on the growth increments of SLD, the maximum age of U. chinensis in our study was inferred to be 169 d.
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Affiliations: 1: College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China 2: College of Marine Science, University of South Florida, St. Petersburg, Florida 33701 3: Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture, Shanghai 201306, China 4: Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture, Shanghai 201306, China 5: Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China 6: National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China

Appeared or available online: 25 July 2018

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