Analyses of egg size, otolith shape, and growth revealed two components of small yellow croaker in Haizhou Bay spawning stock -- Journal of Oceanology and Limnology,2019,37(4):1423-1429

	Cite this paper:
	JIANG Yiqian, ZHANG Chi, YE Zhenjiang, TIAN Yongjun. Analyses of egg size, otolith shape, and growth revealed two components of small yellow croaker in Haizhou Bay spawning stock[J]. Journal of Oceanology and Limnology, 2019, 37(4): 1423-1429

Analyses of egg size, otolith shape, and growth revealed two components of small yellow croaker in Haizhou Bay spawning stock

JIANG Yiqian¹, ZHANG Chi¹, YE Zhenjiang¹, TIAN Yongjun^1,2

1 Fisheries College, Ocean University of China, Qingdao 266003, China;
2 Laboratory for Marine Fisheries Science and Food Production Processes, Pilot National Laboratory for Marine Science and Technology, Aoshanwei, Qingdao 266071, China

Abstract:

The geographical variations in life history characteristics of small yellow croaker Larimichthys polyactis, caused by experienced different environmental conditions, have been observed in China seas. Previous studies based on spatial distribution, migration route, and body morphometrics suggested a complex stock structure. In this study, to clarify the source of a spawning stock, we investigated the reproduction strategy and inter-structure of the Haizhou Bay (HZB) spawning stock in the middle Yellow Sea from both egg survey and adult otolith increment analysis. Egg and adult samples were collected from three surveys during spawning season in 2013. Distinct spatial and temporal variations were detected in egg distribution and size, and otolith shape analysis of adult fishes revealed two morphotypes with different increment growth using random forest cluster. The results indicate the existence of two components within the same spawning stock in HZB from different wintering grounds, and accordingly special protection should be required for this stock given the significance to maintain connectivity between adjacent subpopulations.

Key words: small yellow croaker|otolith shape|otolith increment|egg|random forest

Received: 2018-04-20 Revised: 2018-09-13

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