Freshwater fish communities



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Figure 2. Percentage brook trout habitat (dark green areas) in HUC10 watersheds in the Narragansett Bay watershed.
  1. Little Narragansett Bay




iii.Fish Communities


In the Little Narragansett Bay watershed, the percent relative abundance of cold-coolwater species ranged from 30 percent in the Wood River to 60 percent in the Lower Pawcatuck River. The percent relative abundance of fluvial species ranged from 18 percent in the Wood River to 57 percent in the Lower Pawcatuck River (Table 4). The three headwaters HUC10s had similar values to one another. Unlike in the Narragansett Bay watershed, the HUC10 located farthest downstream had the highest metric values. Figure 3 plots the percent relative abundance of cold-coolwater and fluvial fish for the Little Narragansett Bay and Southwest Coastal Ponds (represented as 504) watersheds, and shows that the data are skewed, as the medians are quite different from the means (diamonds) – an exception for the cold-coolwater metric for the Upper Pawcatuck River (represented as 502) – within each HUC10 watershed and as compared among HUC10 watersheds.
Table 4. Average of percent relative abundance for cold-coolwater fish and fluvial fish by HUC10 in the Little Narragansett Bay watershed. SD = standard deviation.

Watershed Name

HUC10

No. Samples

Average Cold-coolwater Fish % (SD)

Average Fluvial Fish % (SD)

Wood River

0109000501

6

30 (37)

18 (33)

Upper Pawcatuck River

0109000502

26

34 (30)

27 (29)

Lower Pawcatuck River

0109000503

65

60 (37)

57 (38)

Part of Southeast Coastal-Pawcatuck River to Eastern Point

0110000303

No Data1

-

-

1 The Estuary Program will incorporate data from Connecticut in future assessments.


Figure 3. Percent relative abundance of cold-coolwater fish and fluvial fish within HUC10 watersheds of the Little Narragansett Bay and Southwest Coastal Ponds watersheds. HUCs are represented by the last 3 digits of their number, see Table 4 for HUC numbers and names (Southwest Coastal Ponds is represented as 504). Horizontal lines indicate medians. Boxes represent the 25th percentile to 75th percentile. Whiskers indicate the range, means shown as open diamonds, solid points are outliers.




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