Southern California Bight 2003 Regional Monitoring Program: IV. Demersal Fishes and Megabenthic Invertebrates


Table VII-7. Total parasite mean intensity by Region collected at depths of 22-198 m in the Southern California Bight, July through October 2003



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Table VII-7. Total parasite mean intensity by Region collected at depths of 22-198 m in the Southern California Bight, July through October 2003.

Table VII-8. Host totals by Outfall Type collected at depths of 22-198 m in the Southern California Bight, July through October 2003.




POTW Outfall Areas

Host species totals were calculated for each POTW Outfall Type (Large-Outfall, Small-Outfall, and Non-Outfall; Table VII-8). Nineteen of 34 species of hosts were collected at all three Outfall Types. Large-Outfall areas consisted of 27 stations, Small-Outfall areas consisted of 15 stations, and Non-Outfall areas consisted of 24 stations (Figure II-3). The total number of stations in which each host was collected was calculated for each Outfall Type (Table VII-9).


Total parasite prevalence and mean intensity were calculated for each host species for each Outfall Type in which it was collected (Tables VII-10 and VII-11, respectively). The Kruskal-Wallis test showed a significant difference in median prevalence for two host species by Outfall Type (p ≤0.05: bigmouth sole, p=0.0227; hornyhead turbot, p=0.0113) and there was a significant difference in median mean intensity for one host species by Outfall Type (p ≤0.05: bigmouth sole, p=0.0119). The total prevalence and mean intensity for bigmouth sole across the three Outfall Types was 73.9% and 2.4 (n=69, 21 stations) in the Large-Outfall areas, 79.2% and 5.1 (n=24, 9 stations) in the Small-Outfall areas, and 47.5% and 2.7 (n=40, 14 stations) in the Non-Outfall areas (Tables VII-9 through VII-12). The total prevalence for hornyhead turbot across the three Outfall Types was 72.4% (n=217, 24 stations) in the Large-Outfall areas, 96.4% (n=28, 9 stations) in the Small-Outfall areas, and 50.5% (n=103, 20 stations) in the Non-Outfall areas (Tables VII-9 through VII-11).
Host-parasite prevalence and mean intensity were calculated for each Outfall Type (Appendix E-E7 and E-E8, respectively). There was no significant difference in median prevalence for any parasite species by Outfall Type (p ≤0.05), but there was a significant difference in median mean intensity for three parasite species by Outfall Type (p ≤0.05: copepod chalimus larvae on H. stomata, p=0.0498; the copepod Acanthochondria fraseri on hornyhead turbot, p=0.0244; and gnathiid isopod praniza on P. verticalis, p=0.0342).

Large-POTW Outfall Areas


Host species totals were calculated for the four Large-POTW Outfall zones in the SCB (HY, LA, OC, SD; Table VII-12). Thirteen of 34 species of hosts were collected at all four Large-Outfalls zones. HY consisted of nine stations, LA consisted of seven stations, OC consisted of eight stations, and SD consisted of three stations (Figure II-3). The total number of stations in which each host was collected was calculated for each Large-Outfall area (Table VII-13).
Total parasite prevalence and mean intensity were calculated for each host species for each Large-Outfall zone in which it was collected (Tables VII-14 and VII-15, respectively). There was no significant difference in median prevalence or median mean intensity for any host species by Large-Outfall (p ≤0.05).
Host-parasite prevalence and mean intensity were calculated for each Large-Outfall zone (Appendix E-E9 and E-E10, respectively). The Kruskal-Wallis test showed a significant difference in median prevalence for two parasite species by Large-Outfall (p ≤0.05: the leech Austrobdella spp. 1 on California scorpionfish, p=0.0194; the copepod Acanthochondria fraseri on hornyhead turbot, p=0.0280), and there was a significant difference in median mean intensity for one parasite species by Large-Outfall (p ≤0.05: the copepod Naobranchia scorpaenae on California scorpionfish, p=0.0335).



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