2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report 2.500 Large Beach Seine Fish density (indiv/m 2 ) 2.000 1.500 1.000 0.500 0.000 Oct 07 Jan 08 Apr 08 Jul 08 Oct 08 Fish density (indiv/m 2 ) 0.030 0.025 0.020 0.015 0.010 0.005 Station 1 (North) Station 2 (South) Otter Trawl 0.000 Oct 07 Jan 08 Apr 08 Jul 08 Oct 08 2.000 Purse Seine Fish density (indiv/m 2 ) 1.600 1.200 0.800 0.400 0.000 Oct 07 Jan 08 Apr 08 Jul 08 Oct 08 Figure 1-8. Mean fish density (individuals/m 2 ) by quarter for large beach seine, otter trawl, and purse seine at Stations 1 and 2 in the Full Tidal Basin (note variable y-axis scales between charts) The large beach seine chart reflects nearshore fish densities. Trends in the beach seine density over time reflect primarily the variations in topsmelt and goby abundance, although the peak in Station 1 density in October 2008 was due to the capture of large numbers of California killifish. Demersal and eelgrass-associated fish density as assessed by the otter trawl was similar at both stations except in the October months, when species such as kelp bass (P. clathratus), salema (Xenistius californiensis), Merkel & Associates, Inc. 45
Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report shiner surfperch (Cymatogaster aggregata), and giant kelpfish (Heterostichus rostratus) were captured at Station 2 (Table 1-5). Trends in the purse seine data were driven primarily by the number of atherinids captured (which made up 81% of the total purse seine catch in 2008), and reflect the high numbers of topsmelt captured in July at Station 2. Figure 1-9 presents the mean biomass (g/m 2 ) of fish by gear by quarter for each station. The biomass values in the large beach seine chart reflect the regular capture of topsmelt and diamond turbot, however the large peak in July at Station 1 is the result of the capture of multiple gray smoothhound, round stingray, and California butterfly ray. Fish biomass in the otter trawl was highest in April and July when larger and more abundant California halibut, diamond turbot, round stingray, and California butterfly ray were captured. Biomass in the purse seine was highest in July with the capture of seven bat rays and a school of yellowfin croaker at Station 1, and highest in July at Station 2 with the capture of nine jacksmelt and the highest catch of topsmelt for all gear types for the whole year. The water quality conditions at the time of each sampling are presented in Table 1-7. All parameters measured in the FTB indicated a well-flushed system, with near-oceanic salinities, and warmer temperatures at Station 1 than 2, except in January, when Station 1 was slightly cooler. Dissolved oxygen was always greater than 5.5 and as high as 9.2 mg/L in the basin. Merkel & Associates, Inc. 46
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Bolsa Chica Lowlands Restoration Mo
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Total Future Full Tidal Basin FFTB
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2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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