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

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

bolsachicarestoration.org
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16.05.2015 Views

BS PM Rep3 Muted Pocket Marsh BS PM Rep2 STATION 1 BS PM Rep1 PS1 Rep1 OT1 Rep1 BS1 Rep1 West Muted Tidal Basin SS WMTB Rep3 SS WMTB Rep2 SS WMTB Rep1 Central Muted Tidal Basin SS CMTB Rep3 OT1 Rep2 BS1 Rep2 PS1 Rep2 SS CMTB Rep2 SS CMTB Rep1 BS1 Rep3 PS1 Rep3 East Muted Tidal Basin OT1 Rep3 Full Tidal Basin OT2 Rep1 PS2 Rep1 BS2 Rep1 OT2 Rep2 PS2 Rep2 BS2 Rep2 STATION 2 OT2 Rep3 BS2 Rep3 PS2 Rep3 Purse Seine Large Beach Seine (BS) Small Beach Seine (SS) Otter Trawl 0 100 200 400 600 800 Meters Fisheries sampling locations Bolsa Chica Lowlands Restoration Project Figure 1-7 Merkel & Associates, Inc.

Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report All fish captured in the nets were transferred to buckets or tubs filled with seawater, worked up, and released. Data collected for fish caught in each haul included species identification, individual counts, standard length (in millimeters [mm]), and wet weight (in grams [g]). Ectoparasites, lesions, or tumors, if any, were also noted. Species that were not identified in the field were transported to the laboratory and identified utilizing field identification references and/or a dissecting microscope. All fish identifications were made using widely accepted field identification guides such as Miller and Lea (1972) and Eschmeyer et al. (1983). Fish nomenclature was standardized in conformance with Nelson et al. (2004). If more than 30 individuals of a species were caught in a replicate of any gear type, a batch sampling procedure was utilized. First, the standard length and weight was measured for 30 randomly selected individuals within the species. Second, the batch weight was measured for 100 additional randomly selected individuals. Finally, the total weight was measured for all of the remaining, uncounted individuals caught in the replicate. The number of uncounted individuals was then estimated using the batch weight of the 100 randomly selected individuals. All survey data were initially recorded in the field on hard copy data sheets and later transferred to a digital database and checked for accuracy. Due to the difficulty of rapidly and conclusively distinguishing between small arrow goby (Clevelandia ios) and shadow goby (Quietula y-cauda) in the field, gobies that may have belonged to either species were identified as "arrow/shadow goby complex". These functionally similar species commonly co-occur and occupy similar niches in the demersal fish community. Vouchers of the gobies collected were brought back to the lab for identification to document the actual species present at a given station. All macroinvertebrates captured in the fish sampling nets were collected, identified to the lowest taxonomic level possible, counted, and released. Due to the tremendous spatial variability of these species and the non-targeted methodology employed here to sample them, collected data were intended to generate a list of species that occur in the project area, rather than to provide definitive density and biomass data on their populations. The data are presented in the following section covering benthic invertebrates. At each study location, physical water quality parameters were measured coincident with the biological sampling described above. A Hydrolab Quanta ® multi-probe, calibrated in accordance with manufacturer specifications, was used to collect temperature, dissolved oxygen, turbidity, and salinity data. Readings were taken near the bottom and top of the water column. Results A total of 42 fish species were captured in 2008 quarterly fish sampling. The sampling results are presented below by sampling area: Full Tidal Basin, Muted Tidal Basins, and Muted Pocket Marsh. Full Tidal Basin A total of 39 species of fish were captured in the FTB in 2008 (Table 1-5). The greatest number of fish was captured at Station 2 (the southern station closer to the inlet), made up of 33 species and dominated by topsmelt (Atherinops affinis) (60% of the total catch). California grunion (Leuresthes tenuis) accounted for 12%, unidentified atherinid juveniles (Atherinidae) 9%, arrow/shadow gobies Merkel & Associates, Inc. 40

BS PM Rep3<br />

Muted Pocket Marsh<br />

BS PM Rep2<br />

STATION 1<br />

BS PM Rep1<br />

PS1 Rep1<br />

OT1 Rep1<br />

BS1 Rep1<br />

West Muted<br />

Tidal Basin<br />

SS WMTB Rep3<br />

SS WMTB Rep2<br />

SS WMTB Rep1<br />

Central Muted<br />

Tidal Basin<br />

SS CMTB Rep3<br />

OT1 Rep2<br />

BS1 Rep2<br />

PS1 Rep2<br />

SS CMTB Rep2<br />

SS CMTB Rep1<br />

BS1 Rep3<br />

PS1 Rep3<br />

East Muted<br />

Tidal Basin<br />

OT1 Rep3<br />

Full Tidal Basin<br />

OT2 Rep1<br />

PS2 Rep1<br />

BS2 Rep1<br />

OT2 Rep2<br />

PS2 Rep2<br />

BS2 Rep2<br />

STATION 2<br />

OT2 Rep3<br />

BS2 Rep3<br />

PS2 Rep3<br />

Purse Seine<br />

Large Beach Seine (BS)<br />

Small Beach Seine (SS)<br />

Otter Trawl<br />

0 100 200 400 600 800<br />

Meters<br />

Fisheries sampling locations<br />

<strong>Bolsa</strong> <strong>Chica</strong> Lowlands Restoration Project<br />

Figure 1-7<br />

Merkel & Associates, Inc.

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