Current Status and Diversity Analysis of the Shrimp Resources in Coastal Waters East of the Zhoushan Islands

Abstract:

In order to assess the current diversity and status of shrimp resources in the coastal waters east of the Zhoushan Islands, data was collected and shrimp fishery resources were investigated from April and November 2018. We used the relative importance index, biodiversity index, and ABC stock curve to identify prawn class based on species composition, biodiversity, dominant species, the spatial distribution of species, and abundance/biomass. The results showed that a total of 32 shrimp species distributed across one order, ten families, and 21 genera, were captured and identified in coastal waters east of the Zhoushan Islands. In the spring, 22 shrimp species were observed, which belonged to nine families and 16 genera. Twenty-nine shrimp species were observed in the fall season, belonging to nine families and 20 genera. There were 19 shrimp species in common between the spring and fall. The number of shrimp species in fall was higher than that of spring, and the dominant species in fall included Parapenaeopsis hardwickii, and Solenocera crassicornis; however, no dominant species was found in spring. The mean value of the biodiversity index and richness index in fall were higher than those in spring, while the evenness index was lower in fall than in spring. The W value of the ABC curve was negative in the spring and positive in the fall. This indicates that the community structure in the spring was greatly disturbed, while that in the fall was less disturbed. In spring and fall, the end of the ABC curve overlapped, showing that the shrimp communities in the coastal waters east of the Zhoushan Islands were certainly polluted to some extent.