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Based on the fishery resources survey data in the outer waters of the Zhoushan Islands in April (spring) and October (autumn) 2018, the composition, quantity distribution and dominant species of fishes were analyzed, and the relationship between them and hydrological environment was analyzed by the CCA method. The results showed that there were 106 species of fish in the waters outside Zhoushan Islands, belonging to 12 orders, 47 families and 80 genera. The fish mass densities in spring and autumn are 210.50 kg/km2 and 829.06 kg/km2 respectively, and the abundance densities are 8.08×103 ind/km2 and 165.94×103 ind/km2 respectively. The density of fish resources in spring is higher in the northwest sea area and lower in the east sea area of the investigated sea area, while the density of fish resources in autumn is higher in the east sea area and lower in the northwest sea area. The dominant species of fish change substantially between the two seasons. The dominant species in spring and autumn were Lophius litulon、Lepidotrig lajaponica、Apogon lineatus and Apogon lineatus、Acropom japonicum. The number of fish species showed significant seasonal and spatial changes, and the number of fish species is higher in the west and northwest near the coastal islands, with most fishes inhabiting in waters with water depth of 50−80 m. The results showed that the spatial and temporal separations of fish communities were obtained from CCA analysis. Surface temperature, bottom temperature and surface salinity were the key environmental factors that affected the composition and quantity distribution of fish species in the sea area under investigation. The strong correlation between fish community and environmental factors reflected the climate change effect on the separation of fish species.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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