Freshwater fish communities


Status Narragansett Bay



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Status




  1. Narragansett Bay




i.Fish Communities


In the Narragansett Bay watershed, the percent relative abundance of cold-coolwater species ranged from 11 percent in the Palmer River to 67 percent in the Upper Blackstone River (Table 2). Percent relative abundance of fluvial species ranged from 9 percent in the Palmer River to 65 percent in the Upper Blackstone River (Table 2). The two metrics are highly correlated (r=0.91), and the data are quite variable. Figure 1 plots the percent relative abundance of cold-coolwater and fluvial fish, and shows that the data are skewed, as the medians are quite different from the means (diamonds) within each HUC10 watershed and as compared among watersheds. The range of data for both metrics within the full Narragansett Bay watershed was 0-100 percent.
Table 2. Average of percent relative abundance for cold-coolwater fish and fluvial fish by HUC10 in the Narragansett Bay watershed. SD = standard deviation.

HUC10 Name

HUC10

No. Samples

Average Cold-coolwater Fish % (SD)

Average Fluvial Fish % (SD)

Upper Blackstone River

0109000301

69

67 (36)

65 (38)

Lower Blackstone River

0109000302

70

50 (38)

46 (41)

Upper Taunton River

0109000401

19

22 (28)

22 (28)

Middle Taunton River

0109000402

55

32 (32)

30 (32)

Threemile River

0109000403

16

28 (34)

29 (34)

Ten Mile River

0109000404

18

20 (30)

18 (30)

Woonasquatucket River-Moshassuck River

0109000405

0

-

-

Pawtuxet River

0109000406

12

25 (17)

18 (33)

Palmer River

0109000407

32

11 (22)

9 (17)

Lower Taunton River-Frontal Mount Hope Bay

0109000408

37

15 (37)

16 (23)

Narragansett Bay

0109000409

54

31 (37)

24 (36)

Figure 1. Percent relative abundance of cold-coolwater fish and fluvial fish within HUC10 watersheds in the Narragansett Bay watershed. HUCs are represented by the last 3 digits of their number, see Table 2 for HUC numbers and names. 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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