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| Feeding Habits of Hairtail Trichiurus japonicus in the Inshore Waters of Southern Zhejiang in Summer and Autumn |
| LIU Zhihao1,2,3, HAN Dongyan1,2,3, GAO Chunxia1,2,3, YE Shen4,5 |
1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;
2. National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China;
3. The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China;
4. Zhejiang Maricultural Research Institute, Wenzhou 325005, China;
5. Zhejiang Key Laboratory of Exploitation and Preservation of Offshore Bio-Resource, Wenzhou 325005, China |
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Abstract The feeding habits hairtail Trichiurus iaponicas were investigated in 599 samples in the inshore waters of southern Zhejiang province in summer and autumn of 2019 by stomach content analysis. Relationships between the feeding habits and environmental factors were evaluated by Canonical Correspondence Analysis (CCA). The results showed that the prey items of T. japonicus included more than 60 species, with dominant preys of brachyura megalopa larva, Benthosema pterotum and Euphausia pacifica. Obvious seasonal variations were revealed for T. japonicus's diet composition, with the percent index of relative importance (IRI%), pisces, planktonic larva, Isopoda and euphausiacea were higher in summer, and the IRI% of pisces and decapoda were higher in autumn. With the increase of T. japonicus's anal length, the main prey items were transferred from small size items (such as planktonic larva and small fish) to big size items (such as Larimichthys polyactis and T. japonicus). Besides, the results of CCA indicated that pH, sea surface temperature and sea surface salinity were the main environmental factors affecting the feeding habits of T. japonicus in the inshore waters of southern Zhejiang. The findings enriched the understanding of feeding habits of T. japonicus in the inshore waters of southern Zhejiang, and provided basic data for ecosystem-based fisheries management in this area.
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Received: 05 February 2021
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