Marine Fish and Benthos Studies - Knik Arm Bridge and Toll Authority

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July data area from July 2005 only). In 2004, the temperature declined during the period from August through November reaching near freezing temperatures by the November sampling effort (0.2 degrees Celsius mean). Salinity varied inversely with temperature (Figure 4), with salinity values at a peak during the early spring and early winter sampling and a late-summer (August) low. This pattern results from the substantial freshwater input during the mid-summer months as warm air temperatures increase glacial runoff in the Knik Arm Watershed. The overall picture of water quality in the Arm is of an area that is well mixed both laterally and vertically by strong currents and vertical turbulence. That said, the suspended sediment in the Arm is relatively coarse-grained and settles fairly rapidly in quiescent waters. As a result, during periods of low wave activity, we frequently saw areas where a thin surface layer, possibly of fresher water, would clear to turbidity levels of 50 NTU or less. 3.2 Existing Intertidal Habitats and Vegetation Stations sampled are described in the following sections and located on Figure 1 Representative photos of selected stations are provided in tabbed section following the figures. 3.2.1 KA 1 – West of Fire Creek Station KA 1 was located adjacent to a relatively steep but densely vegetated bank and riparian area just west of a high marsh bench near the mouth of Fire Creek. The riparian vegetation was a mix of willow (Salix spp.), alder (Alnus sp.), birch (Betula sp.), and spruce (Picea sp.). The marsh bench was dominated by dune grass (Elymus sp.), silverweed (Potentilla anserina), arrow grass (Triglochin maritimum), and seaside plantain (Plantago maritima). The upper intertidal zone was gravel and sand with scattered clumps of marsh vegetation and sod that had eroded from the marsh bench. Arrow grass, silverweed, and salt grass (Puccinellia sp.) were growing in the upper mud beach mid to late summer. 3.2.2 KA 2 – North Entrance to Goose Bay Station KA 2 was north of the north entrance to Goose Bay at the toe of eroding bluffs with limited patches of willows and alders and an occasional spruce on the slope. The upper beach (all that was visible at the time of sampling events) was gravel and cobble with scattered larger boulders. Pentec Environmental Page 10 12214-12 November 30, 2005
3.2.3 KA 3 – North Entrance to Eagle Bay Station KA 3 was placed north of the north entrance to Eagle Bay at the toe of eroding bluffs with limited patches of willows and alders and an occasional spruce on the slope. The upper beach was gravel and cobble with scattered larger boulders (Photo 4). A broad flat of armored gravel began at about +8 feet MLLW. Tufts of newly sprouted salt grass were present in clay patches along the upper beach in August 2004. 3.2.4 KA 5A – Eagle Bay North Shore This station was selected for sampling during late November 2004 because it was the only place north of Cairn Point where the combination of beach slope and ice conditions allowed sampling (Photo 5). The site lay at the mouth of a small drainage ravine entering the north side of Eagle Bay. The upper beach was gravel and cobbles and the middle and lower beach was moderately sloped silt/clay. The backshore and ravine bottom and sides were relatively low gradient and heavily vegetated with spruce, birch, and cottonwood (Populus trichocarpa). 3.2.5 KA 6A and KA 6B – Mid Goose Bay Station KA 6A was located immediately adjacent to the south shore of the mouth of Goose Creek on a mixed beach of angular cobbles and boulders in a matrix of sand and pebbles. Because of difficult access, the site was only sampled in June 2005 and because of the limited area where seining is possible, only the 30-foot beach seine was used. No fish were captured at this site. Station KA 6 B was south of KA 6A and could be fished with the 120-foot seine at tides below about mean higher high water. The beach was fairly steep pebbles and sand and had scattered boulders and a substantial amount of large woody debris was scattered about (Photo 6). 3.2.6 KA 7 – South Entrance to Eagle Bay Station KA 7 was located at the toe of eroding bluffs with patches of willows at the high tide line. The upper beach was gravel and sand with scattered larger cobbles and boulders embedded in a hard clay matrix. The middle beach had a band of fine relatively soft gray clay that extended relatively low into the intertidal zone (i.e., below +10 feet MLLW). This station had limited amounts of the green alga, Enteromorpha linza, as well as scattered tufts of newly sprouted salt grass, Puccinellia sp. in mid to late summer. Small patches of a unicellular or Pentec Environmental Page 11 12214-12 November 30, 2005
Page 1 and 2: Marine Fish and Benthos Studies in
Page 3 and 4: CONTENTS Page EXECUTIVE SUMMARY E-1
Page 5 and 6: CONTENTS (CONT.) FIGURES (CONT.) 14
Page 7 and 8: MARINE FISH AND BENTHOS STUDIES IN
Page 9 and 10: Among the non-salmonids, threespine
Page 11 and 12: The extreme turbidity and poor visi
Page 13 and 14: MARINE FISH AND BENTHOS STUDIES IN
Page 15 and 16: 2.2 Sample Methods MacKenzie facili
Page 17 and 18: will conduct a fatty acid analysis
Page 19 and 20: 2.3 Laboratory Analysis (Figure 3).
Page 21: Null hypotheses were tested using t
Page 25 and 26: 3.2.10 KA 11 and KA 11A - Cairn Poi
Page 27 and 28: 3.2.15 PM SS and PM S1 through PM S
Page 29 and 30: plus range) seen in July of both ye
Page 31 and 32: greater number of stations sampled)
Page 33 and 34: were common throughout the summer.
Page 35 and 36: 3.3.2.5 Longfin Smelt 2004. Two-hun
Page 37 and 38: 3.3.2.9 Tide Stage vs. Catch Beach
Page 39 and 40: (4.0 per set) followed by pink salm
Page 41 and 42: Ten species of fish were captured i
Page 43 and 44: species of polychaete worm, Neanthe
Page 45 and 46: 3.4.4 Facilities Sampling 3.4.4.1 F
Page 47 and 48: flow meter reading to standardize t
Page 49 and 50: each seines in 2005. In summer/fall
Page 51 and 52: salmonid catches in Moulton’s (19
Page 53 and 54: (Figure 8), the larger size of the
Page 55 and 56: 4.4 Knik Arm Ecological Conditions
Page 57 and 58: An apparent near absence of inverte
Page 59 and 60: 4.4.4 Importance of Littoral Habita
Page 61 and 62: 5.0 REFERENCES Bakus, G., M. Orys,
Page 63 and 64: Simenstad, C.A., C.D. Tanner, W.M.
Page 65 and 66: Table 1 - Knik Arm 2004 and 2005 Sa
Page 67 and 68: Table 3 - Total 2004 and 2005 Month
Page 69 and 70: Table 5 - Fish CPUE in 2004; 120-Fo
Page 71 and 72: Table 7 - Fish CPUE in 2005; 120-Fo
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Table 9 - Fish CPUE in 2005 as a Fu
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Table 11 - Total Fish CPUE by Tow N
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Table 13 - Total Catch and CPUE in
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Table 15 - Total Fish Catch in 2005
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Table 17 - Statistical Analyses of
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Table 19 - Total Catch and CPUE of
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Pentec Environmental 12214-12 Novem
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6-2 Knik Arm Crossing Tow Net Locat
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Water Quality of Knik Arm, 2004 - 2
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Juvenile Salmonid CPUE over Time; 1
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Length Frequencies of Juvenile Coho
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Length Frequencies of Juvenile Chum
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CPUE for Stickleback Species; 120-F
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CPUE for Saffron Cod and Longfin Sm
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Length Frequencies of Longfin Smelt
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Juvenile Salmonid CPUE over Time in
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Non-Salmonid CPUE over Time in Tow
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Length Frequencies of Sockeye Salmo
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Length Frequencies of Chinook Salmo
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Invertebrate CPUE by Species in 200
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Relationship of Tidal Stage and Inv
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Invertebrate CPUE by Transect in 20
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Invertebrate Monthly CPUE in Port M
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Invertebrate CPUE by Station; Port
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Pentec Environmental 12214-12 Photo
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MEMORANDUM DATE: August 13, 2004 TO
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HDR Alaska, Inc. 12214-10 August 13
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HDR Alaska, Inc. 12214-10 October 6
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MEMORANDUM DATE: October 6, 2004 TO
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HDR Alaska, Inc. 12214-10 October 6
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HDR Alaska, Inc. 12214-10 November
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MEMORANDUM DATE: November 22, 2004
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HDR Alaska, Inc./Integrated Concept
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MEMORANDUM DATE: May 13, 2005 TO: F
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HDR Alaska, Inc. 12214-12 May 13, 2
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MEMORANDUM DATE: July 8, 2005 TO: F
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HDR Alaska, Inc. 12214-12 July 8, 2
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MEMORANDUM DATE: August 10, 2005 TO
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APPENDIX B Invertebrate Data Sheet
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APPENDIX B Invertebrate Data Sheet
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Appendix B (cont.) Table B-2: Inver
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Appendix B (cont.) Table B-5: Stati
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Table C-1: Summary of CPUE by all G
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Table C-3 Summary of Catch and Perc
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Marine Fish and Benthos Studies - Knik Arm Bridge and Toll Authority

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