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Identifying Key Habitats for Juvenile Salmon in the Fox River Flats Estuary

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Identifying Key Habitats for Juvenile Salmon in the Fox River Flats Estuary Identifying Key Habitats for Juvenile Salmon in the Fox River Flats Estuary Final Project Report T-30-3P17 Prepared for the State and Tribal Wildlife Grant Fund by Coowe Moss Walker1 Charles Simenstad2 Tammy Hoem Neher3 Steven J. Baird1 Jasmine Maurer1 Elizabeth Sosik2 1Kachemak Bay Research Reserve, 95 Sterling Highway, Suite 2, Homer, AK 99603, 2University of Washington, School of Aquatic and Fishery Sciences, Wetland Ecosystem, Wetland Ecosystems Team, 3NOAA Kasitsna Bay Lab, 2181 Kachemak Drive, Homer, AK 99603 Completed September 2013 Walker et al. 2013 Fox River Estuary Juvenile Salmon Habitats Page 1 Identifying Key Habitats for Juvenile Salmon in the Fox River Flats Estuary Final Report Study History We studied juvenile salmon use of estuarine habitats in the Fox River estuary at the head of Kachemak Bay, Alaska. The Fox River estuary is located within the boundaries of the Kachemak Bay National Estuarine Research Reserve, and is identified as a Critical Habitat Area by the state of Alaska. Very little was known about salmon use in the estuary prior to our initial field investigations, which began in 2009. In the first year of research, we demonstrated broad spatial and temporal patterns in fish use of the various estuarine habitats. Subsequent field studies in 2010 and 2011 focused on refining understanding of select habitats that were identified as being heavily used by juvenile salmon. Emphasis was placed on understanding juvenile salmon residency in estuarine habitats along a gradient of physical characteristics, and in particular on patterns in diet and growth in the predominant juvenile salmon species; Coho (Onchorhynchus kisutch), and Sockeye (O. nerka) salmon. This work was funded through a State and Tribal Wildlife Grant from the US Fish and Wildlife Service to the Kachemak Bay Research Reserve, and was conducted in collaboration with the University of Washington, and the University of Alaska, Fairbanks. Project Abstract This project offers the first scientific research of fish communities in the Fox River Flats Critical Habitat Area, located in Kachemak Bay, southern Cook Inlet, Alaska. Fish assemblages were assessed in a variety of habitats initially, with research becoming focused on juvenile salmon in four tidal channel habitats spanning an estuarine gradient from oligohaline near the top of the estuary to euryhaline near the mouth. Water temperature, salinity and depth in these channels were driven by varying mixing of glacial melt water from the Fox River and tidal influence. Over 14,000 fish were sampled in the four tidal channels over the duration of the project. Juvenile Coho and Sockeye salmon were the most abundant species in the channels, with both species peaking in July, with densities of 30 Coho/m and 18 sockeye/m. Both species were present from at least late April through early October. Diet samples were analyzed from 113 Coho and 104 Sockeye. Juvenile Coho and Sockeye salmon fed on 83 different prey taxa overall, with Sockeye having somewhat more compressed diets than Coho salmon. Seasonal bioenergetic models show high rates of growth in August (0.15-0.19 g g-1 d-1), likely fueled by high consumption rates and high energy density of prey. The prolonged presence and active feeding, substantiates that the Fox Walker et al. 2013 Fox River Estuary Juvenile Salmon Habitats Page 2 River estuary provides is providing beneficial rearing and outmigration staging habitats for juvenile Coho and Sockeye salmon. Key Words Kenai Peninsula, Alaska, glacial landscape, estuary, salmon, insect prey, diet, growth, residency, bioenergetics, saltmarsh mapping, Coho salmon, Sockeye salmon Project Data Description of data- Data were collected in the field for water level, temperature, barometric pressure, fish species, fish counts, fish size fish diets, invertebrates, and vegetation. Fish were identified in the field and laboratory, with digital images taken as reference. Macroinvertebrate identifications were completed at the University of Washington, Wetland Ecosystem Team Lab in Seattle, WA, where a voucher collection is housed. Plant analyses were conducted by the Kachemak Bay Research Reserve staff, Homer Alaska. Format - All data were entered as Excel spreadsheets and Access database. Custodian – contact Coowe Walker, Kachemak Bay Research Reserve, 95 Sterling Highway, Suite 2, Homer, AK 99603. Citation Walker CM, Simenstad CA, Hoem Neher T, Baird SJ, Maurer J, and Sosik E. 2013. Identifying Key Habitats for Juvenile Salmon in the Fox River Flats Estuary. State Wildlife Grant Project T-10-3 P17 Final Report. Walker et al. 2013 Fox River Estuary Juvenile Salmon Habitats Page 3 Table of Contents, including Lists of Tables and Figures Introduction ........................................................................................................................... 6 Objectives ............................................................................................................................. 12 Overview of study area ......................................................................................................... 12 Methods ................................................................................................................................ 15 Site Selection ........................................................................................................... 15 Physical Habitat Sampling ....................................................................................... 17 Fish Abundance Sampling ....................................................................................... 19 Laboratory Analysis; fish condition, weight and age .............................................. 20 Outmigration Timing ............................................................................................... 21 Diet Composition ..................................................................................................... 22 Prey Availability ...................................................................................................... 22 Diel Consumption Rate ............................................................................................ 24 Bioenergetics estimation of potential growth .......................................................... 24 Salt Marsh Mapping ................................................................................................. 25 Results ................................................................................................................................... 26 Physical Habitat ....................................................................................................... 27 Fish Community and Abundance Data .................................................................... 32 Juvenile Salmon Abundance .................................................................................... 33 Fish Growth and Habitat Use ................................................................................... 39 Vegetation Composition .......................................................................................... 40 Prey Availability ...................................................................................................... 45 Fish Diet Composition ............................................................................................. 51 Diel Consumption Rate ............................................................................................ 63 Bioenergetics estimate of growth ............................................................................. 67 Discussion ............................................................................................................................. 70 Future Studies ....................................................................................................................... 72 Acknowledgements ............................................................................................................... 72 Literature Cited ..................................................................................................................... 73 Figures Figure 1.View from the bluff, looking down to Fox River CHA ............................ 8 Figure 2. Aerial image of Fox River Flats, including CHA boundary ..................... 13 Figure 3. Sampling locations for 2009. ................................................................... 16 Figure 4. Sampling locations for 2010 and 2011 ..................................................... 17 Figure 5 Photo: collecting physical habitat data ..................................................... 18 Figure 6. Photo: sampling with fyke nets ................................................................ 19 Figure 7. Photo: sampling with pole seines ............................................................. 20 Figure 8.Photo: Bismark brown dyed fish ............................................................... 21 Figure 9. Photo: antenna array ................................................................................. 22 Figure 10. Photo: insect fall-out traps ...................................................................... 23 Figure 11. Salinity and temperature point data ........................................................ 27 Figure 12. Seasonal salinity data ............................................................................ 28 Figure13. Interannual seasonal variability across channels ..................................... 29 Figure 14. 2011
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