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

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CONTENTS (CONT.) PHOTOGRAPHS (CONT.) 14 Station KA 16, lower beach face, May 2005. 15 Station KA 16, scoured sand and silts on lower flat, July 2004. 16 Station KA 16, rockweed on boulder, July 2004. 17 PM SS and PM S1 from offshore, July 2005. 18 Visible tracks of Neanthes limnicola burrow at Station KA 14. APPENDIX A MONTHLY FIELD SUMMARIES APPENDIX B INVERTEBRATE CATCH IN BEACH SEINES BY STATION AND TIME APPENDIX C SPECIES AND PERCENT OF CATCH FOR EACH GEAR TYPE AND YEAR Pentec Environmental 12214-12 November 30, 2005 Page iv
MARINE FISH AND BENTHOS STUDIES IN KNIK ARM ANCHORAGE, ALASKA EXECUTIVE SUMMARY Background Approach Results Knik Arm (the Arm) is a shallow glacial estuary with extreme physical habitats characterized by large tidal ranges, strong currents, massive inputs of glacial and coastal sediment, and severe seasonal ice scour. Despite these conditions, the 1983 Knik Arm Crossing studies (Dames & Moore 1983) demonstrated a surprising level of biological activity in the Arm. The present study provides recent data and analyses of ecological conditions in the Knik Arm estuary based on sampling of fish and benthic invertebrates conducted in 2004 and 2005. This study was initiated by the Knik Arm Bridge and Toll Authority (KABATA) as part of a baseline data collection program relating to ongoing environmental analyses of the proposed Knik Arm Crossing project. Fish and macroinvertebrates were collected by beach seine monthly from July through November 2004 and from April through July 2005. Beach seining from Point Woronzof to Fire Creek included several stations sampled during the 1983 Knik Arm Crossing studies and several new stations (Figure 1). Beach seine, otter trawl, and benthic cores were used to sample nearshore fish and benthic invertebrates. To gain a better understanding of the ecology of the central (offshore) part of the Arm, surface tow net sampling was conducted from May through July 2005 on a series of transects across the Arm between Point Woronzof and Six Mile Creek. Sampling around Port MacKenzie facilities was conducted using a fixed tow net and a 30-foot beach seine in June and July 2005. Water quality, specifically temperature, salinity and turbidity, were recorded at all locations on all dates sampled. Water Quality The overall picture of water quality in Knik Arm is of an area that is extremely well mixed both laterally and vertically by strong currents and vertical Pentec Environmental Page E-1 12214-12 November 30, 2005
Page 1 and 2: Marine Fish and Benthos Studies in
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Page 5: CONTENTS (CONT.) FIGURES (CONT.) 14
Page 9 and 10: Among the non-salmonids, threespine
Page 11 and 12: The extreme turbidity and poor visi
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Page 15 and 16: 2.2 Sample Methods MacKenzie facili
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Page 19 and 20: 2.3 Laboratory Analysis (Figure 3).
Page 21 and 22: Null hypotheses were tested using t
Page 23 and 24: 3.2.3 KA 3 - North Entrance to Eagl
Page 25 and 26: 3.2.10 KA 11 and KA 11A - Cairn Poi
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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
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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
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Page 55 and 56: 4.4 Knik Arm Ecological Conditions
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An apparent near absence of inverte
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4.4.4 Importance of Littoral Habita
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5.0 REFERENCES Bakus, G., M. Orys,
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Simenstad, C.A., C.D. Tanner, W.M.
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Table 1 - Knik Arm 2004 and 2005 Sa
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Table 3 - Total 2004 and 2005 Month
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Table 5 - Fish CPUE in 2004; 120-Fo
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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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