. Bulletin. Science. 0 2 4 6 8 1012 141618 20 22 24 26 28 30 32 34 36 38 40 42 4446 48! Age (days) 1990 17RS 20 18 LU 16 ?â « E12 18 3 6 § 4. 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 Age (days) Fig. 10. Examples of increment width profiles from four YOY kelp bass which may have under- gone delayed settlement. (A) 1989 50rs = right sagitta from the fiftieth YOY kelp bass collected in 1989, (B) left sagitta from the forty-second YOY kelp bass collected in 1989, (C) left sagitta from the twenty-ninth YOY kelp bass collected in 1990, (D) right sagitta from th
. Bulletin. Science. 0 2 4 6 8 1012 141618 20 22 24 26 28 30 32 34 36 38 40 42 4446 48! Age (days) 1990 17RS 20 18 LU 16 ?â « E12 18 3 6 § 4. 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 Age (days) Fig. 10. Examples of increment width profiles from four YOY kelp bass which may have under- gone delayed settlement. (A) 1989 50rs = right sagitta from the fiftieth YOY kelp bass collected in 1989, (B) left sagitta from the forty-second YOY kelp bass collected in 1989, (C) left sagitta from the twenty-ninth YOY kelp bass collected in 1990, (D) right sagitta from the seventeenth fish collected in 1990. Settlement check = closed triangles. Bars represent ± one standard error around the mean. fish may have undergone a slow-growth phase which delayed their time of set- tlement, although quantitative confirmation was difficult to obtain. The smallest settled YOY kelp bass captured was mmSL and determined to be 31 days old from otolith counts. To determine the average size at settlement, fish between the ages of 25-36 days (the range of settlement ages determined earlier) were presumed to have been captured immediately after settlement. These fish ranged in size from mmSL and averaged mmSL. Discussion Reproduction and Spawning Data from back-calculated spawn dates (Fig. 5) show the pattern of a summer spawner, although the time of peak spawning activity could not be determined due to logistical limits on the duration of sampling each summer. Studies char- acterizing the spawning season of kelp bass on the basis of seasonal gonad mat- uration (Smith and Young 1966) and the presence of larvae from the three species of Paralabrax in the ichthyoplankton from the southern Californian Bight (Walker et al. 1987), indicate that spawning activity begins in May, peaks in August or September, and ceases by October. Recent work by Oda et al. (1993) suggests. Please note that these images are extracted from scanned page images
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectscience
