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In addition to information on fish behavior, pile driving is a good source of information on fish abundance. Pile driving has been used to count large crustaceans (Balanus amphitrite) in the North Sea (Hassett et al. 2001). Pile driving was used to quantify the total volume of zooplankton (Brachionus spp.) in one square kilometer of the northern Gulf of Mexico (Berg et al. 2002). Pile driving has also been used to quantify the abundance of fish (Scomber spp.) in the Gulf of Mexico (Schlievert et al. 2007).
Pile driving sounds can be used to monitor fish behavior. One notable example is the underwater behavior of shoals of juvenile cod (Gadus morhua) in response to seismic pile driving in the North Sea (Dahlbäck et al. 2003). When a pile is driven, the fish move away from the source and forms a floc that rapidly coalesces. This behavior may be used to detect and locate fish aggregations in near real-time.
As mentioned above, pile driving is also a good source of information on fish species. An example is the use of pile driving to monitor the occupancy of fish aggregations during a seismic survey in the Northwest Atlantic (Crowley et al. 2010). The acoustic response of more than 500 fish species to pile driving was analyzed to determine the number of each species present in the aggregate. The species included haddock (Melanogrammus aeglefinus), Atlantic cod (Gadus morhua), scup (Stenotomus spp.), sand lance (Ammodytes spp.), Atlantic herring (Clupea spp.), Pacific herring (Clupea spp.), and alewife (Alosa spp.).
The maximum received levels in the reported studies are higher than those in natural environments. In a study of pile driving sound (Experiment 2 in Fig. 13.11a), Vetter et al. (2014) played acoustic signals to flounder (Platichthys flesus) in the North Sea and observed a range of responses, including shoaling and behavioral avoidance. As the received level increased, shoaling occurred earlier and occurred at higher received levels (Fig. 13.11b). At higher received levels, fish avoided the sound by moving deeper. Maximal received level was 130 dB re 1 μPa and a depth of 2.5 m.
Peer Group Questions – Think about the size of the private equity firm and the industry you are applying to. How did the firm decide to go with that size? Can you think of a situation where a firm would consider a different size? What kind of questions would you ask to determine whether a particular size or industry is right for you?
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