. Bulletin. Science. SURVIVAL AND THERMAL TOLERANCES OF MARINE FISH OF CALIFORNIA 199 24 48 72 Hour Block 96 120 144 Fig. 3. Percent mortality by hour block for fishes collected during heat treatments at Scattergood Generating Station. scorpionfish {Scorpaena guttata), and brown rockfish (Sebastes auriculatus) (Table 1). For the collected individuals, peak mortality occurred within the first 48-hrs, with nearly 9% perishing within the first 24-hrs (Figure 3). This figure was greatly influenced by the high mortality of bat rays, followed by nearly 70% of all queenfish perishing within the
. Bulletin. Science. SURVIVAL AND THERMAL TOLERANCES OF MARINE FISH OF CALIFORNIA 199 24 48 72 Hour Block 96 120 144 Fig. 3. Percent mortality by hour block for fishes collected during heat treatments at Scattergood Generating Station. scorpionfish {Scorpaena guttata), and brown rockfish (Sebastes auriculatus) (Table 1). For the collected individuals, peak mortality occurred within the first 48-hrs, with nearly 9% perishing within the first 24-hrs (Figure 3). This figure was greatly influenced by the high mortality of bat rays, followed by nearly 70% of all queenfish perishing within the first 24-hrs (Table 1). The overall survivability of queenfish was poor, with one out of 11 individuals collected surviving the holding period. Overall, 11 out of 15 species with greater than 10 individuals collected exhibited greater than 80% latent survival rates. Inferred Critical Thermal Maxima The principle stressor on fishes observed during heat treatments was the forebay water temperature (designed to exceed 38°C), which interferes with the metabolic processes of most fish (Helfman et al. 1997). Although all fishes entrapped within the enclosed forebay were subjected to these conditions, notable differences have been observed with regards to their varying thermal tolerances. Species-specific abundance within the FRS elevator was indicative of the relative composition of the entrapped assemblage, as it has been anecdotally noted that various species arrive in the elevator area in sequential stages related to water temperature (R. H. Moore, MBC Applied Environmental Sciences, personal communication). Fish abundance by 1°C temperature interval illustrates a wide-ranging distribution among the 29 most abundant species over the period 2000-2005 (Table 2). Of these, the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the o
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