. Bulletin - Southern California Academy of Sciences. Science. STATUS OF STEELHEAD TROUT IX MALIBU CREEK. £ £ <$ £ £ # * 4= * # * # * # # # # & <yl £ tf .tf ^ ^ tf $ ^ tf Date Fie. 4. Abundance of 0. mvkiss in Malibu Creek June 2005-November 2007. trout, three adults (over 30 cm total length) were quite pale in color and one adult exhibited the same yellow color and sluggish behavior observed the previous year. By November 2007. the number of trout observed had dropped to nine adult fish, possibly due to reduced visibility during the survey. A subsequent stream walk survey done in Ja
. Bulletin - Southern California Academy of Sciences. Science. STATUS OF STEELHEAD TROUT IX MALIBU CREEK. £ £ <$ £ £ # * 4= * # * # * # # # # & <yl £ tf .tf ^ ^ tf $ ^ tf Date Fie. 4. Abundance of 0. mvkiss in Malibu Creek June 2005-November 2007. trout, three adults (over 30 cm total length) were quite pale in color and one adult exhibited the same yellow color and sluggish behavior observed the previous year. By November 2007. the number of trout observed had dropped to nine adult fish, possibly due to reduced visibility during the survey. A subsequent stream walk survey done in January 2008 by CDFG biologists observed a total of five adult trout and a recently excavated redd (McKibbin. 2008). Snorkel surveys conducted in June and July 2008 counted over trout, with fish under 10 cm most abundant ( in June and 2,327 in July). In June surveys, 24 adults over 50 cm long were observed, compared to five in July. The remainder of the fish ranged from 10-25 cm in length. Invasive non-native species have also rebounded, attaining abundances similar to those observed before the die-off event. Flow Flow was continuous throughout the study area and to the ocean during the entire die-off event, with levels ranging between cubic meters/second (cms), with mean flows of cms in July 2006. cms in August and cms in September 2006. Water temperature In 2006. water temperatures ranged between degrees C (Figure 5). Peak temperatures were observed from July 18-30. when water temperatures exceeded degrees C. a temperature commonly considered to be near the upper end of the range of O. mvkiss. for much of this 12-day period (Table 1). The proportion of the time in which temperatures exceeded degrees C was much greater in 2006 than were observed in either 2005 or 2008 (Figure 6). Table 2 compares the percent time at each 2-degree temperature interval recorded in 2005. 2006. 2008. No temperature data were coll
Size: 1726px × 1448px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
