SILVERING INDEXES FOR SPAWNING MIGRATORY POPULATION OF THE JAPANESE EEL <i>ANGUILLA JAPONICA</i> IN THE YANGTZE RIVER ESTUARY, CHINA

GUO Hong-Yi; ZHENG Li; YE Ya-Meng; TANG Wen-Qiao; ZHANG Ya; Zhang Xu-Guang

doi:10.7541/2019.017

Volume 43 Issue 1

Dec. 2018

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ACTA HYDROBIOLOGICA SINICA > 2019 > 43(1): 133-141. > DOI: 10.7541/2019.017

GUO Hong-Yi, ZHENG Li, YE Ya-Meng, TANG Wen-Qiao, ZHANG Ya, Zhang Xu-Guang. SILVERING INDEXES FOR SPAWNING MIGRATORY POPULATION OF THE JAPANESE EEL ANGUILLA JAPONICA IN THE YANGTZE RIVER ESTUARY, CHINA[J]. ACTA HYDROBIOLOGICA SINICA, 2019, 43(1): 133-141. DOI: 10.7541/2019.017

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SILVERING INDEXES FOR SPAWNING MIGRATORY POPULATION OF THE JAPANESE EEL ANGUILLA JAPONICA IN THE YANGTZE RIVER ESTUARY, CHINA

1.
Shanghai Universities Key Laboratory of Marine Animal Taxonomy and Evolution, Shanghai 201306, China
2.
International Research Center for Marine Biosciences at Shanghai Ocean University, Ministry of Science and Technology, Shanghai 201306, China
3.
National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China

Funds: Supported by the National Natural Science Foundation of China (31472280)

Received Date: January 09, 2018
Rev Recd Date: May 18, 2018
Available Online: October 11, 2018
Published Date: December 31, 2018

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Abstract

Abstract

To establish a simple and reliable index for determining silvering stages of the Japanese eel, Anguilla japonica, we observed the colorations of various body parts and biological characteristics on the reproductive stock of the eels from the Yangtze River estuary before starting their oceanic migrations. The body color, and age, total length, body weight, and silvering index were analyzed in the silvering process of the Japanese eel. The two silvering stages are characterized by the colorations of trunk skin as follows: (1) Pre-silver stage: pigments deposited completely on the upper edge of pectoral fin on the lateral sides of trunk, (2) Silver stage: pigments deposited completely on the lower edge of pectoral fin on the lateral sides of trunk.The body size, eye diameter, pectoral fins length and gonad-somatic index were increased from pre-silver stage to silver stage, and digestive tract index were decreased in contrast. The principal component analysis demonstrated that the silver stage eels had larger eye and pectoralfins, higher sexual maturity and the degenerated digestive tract compared to pre-silver stage eels. Without feeding, the various modifications of the body and physiological changes indicated that silver eels developed various adaptations to prepare the long oceanic migration. The silver stage and pre-silver stage could be distinguished by canonical discriminant function analysis using five characters with a 95% reliability for correct classification. Our results revealed that an eye index of 5.0 is the cut off point for distinguishing the silver stage from the pre-silver stage of the Japanese eels for the field survey.
- Catadromous migratory population,
- Silvering indexes,
- Discriminant basis,
- Japanese eel,
- the Yangtze River

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References

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SILVERING INDEXES FOR SPAWNING MIGRATORY POPULATION OF THE JAPANESE EEL ANGUILLA JAPONICA IN THE YANGTZE RIVER ESTUARY, CHINA

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