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Length-weight, length-length relationships, and condition factors of black rockfish Sebastes schlegelii Hilgendorf, 1880 in Lidao Bay, China

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Abstract

In this study, we analyzed the length-weight relationships (LWRs), total length (TL)—standard length (SL) relationships (LLRs), and Fulton’s condition factor (K) of male and female black rockfish Sebastes schlegelii Hilgendorf, 1880 in Lidao Bay, Yellow Sea, China. Among the 729 S. schlegelii specimens sampled seasonally in February, May, August and November between 2011 and 2015, most were males (sex ratio = 1 male:0.79 female). The LWRs of each season were significant (P < 0.05), and all coefficients of determination (r 2) were higher than 0.95. The values of the slope (b) estimated for each LWR regression varied from 2.947 to 3.277 and were lower in spring than those in other seasons, especially in females. The LLRs calculated as the regression of TL on SL and vice versa were linear. The values of K ranged from 0.791 to 2.981 in males (n = 407) and from 0.752 to 2.681 in females (n = 322), and the highest value was found in spring. The present results provide baseline information on biological data of LWRs, LLRs, and K for S. schlegelii in this area, and will be useful in further studies on stock management of S. schlegelii.

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Acknowledgments

This research was funded by the National Special Research Fund for Non-Profit Marine Sector (No. 201305043), Special Program for Basic Research of the Ministry of Science and Technology of China (No. 2014FY110500), the Scientific and Technological Innovation Project Financially Supported by Qingdao National Laboratory for Mairne Science and Technology (No. 2015ASKJ02), the National Key Basic Program of Science and Technology-Platforms of Aquaculture Stock Resources and the IOCAS funding (No. 2012IO060102). We would like to express many thanks to all colleagues and students in our laboratory for their assistance in field sampling and sample analyses.

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Authors and Affiliations

  1. Key Laboratory of Experimental Marine Biology, National & Local Joint Engineering Laboratory of Ecological Mariculture, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, 266071, China

    Lijuan Wang, Zhihao Wu, Peijun Zhang & Feng You

  2. Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, No.1 Wenhai Road, Aoshanwei, Jimo, Qingdao, 266237, China

    Lijuan Wang, Zhihao Wu, Peijun Zhang & Feng You

  3. University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing, 100049, China

    Lijuan Wang

  4. Marine Biology Institute of Shandong Province, No.7 Youyun Road, Qingdao, 266014, China

    Mengxia Liu, Wei Liu, Wenxi Zhao & Hongjun Liu

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  1. Lijuan Wang
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  2. Zhihao Wu
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  4. Wei Liu
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Correspondence to Feng You.

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Wang, L., Wu, Z., Liu, M. et al. Length-weight, length-length relationships, and condition factors of black rockfish Sebastes schlegelii Hilgendorf, 1880 in Lidao Bay, China. Thalassas 33, 57–63 (2017). https://doi.org/10.1007/s41208-017-0021-6

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