Disease induced by the sea louse (Lepeophtheirus salmonis) (Copepoda: Caligidae) in wild sockeye salmon (Oncorhynchus nerka) stocks of Alberni Inlet, British Columbia

被引:68
作者
Johnson, SC
Blaylock, RB
Elphick, J
Hyatt, KD
机构
[1] FISHERIES & OCEANS CANADA,BIOL SCI BRANCH,PACIFIC BIOL STN,NANAIMO,BC V9R 5K6,CANADA
[2] STANFORD UNIV,HOPKINS MARINE STN,PACIFIC GROVE,CA 93950
[3] UNIV ALBERTA,DEPT BIOL SCI,EDMONTON,AB T6G 2E9,CANADA
关键词
D O I
10.1139/cjfas-53-12-2888
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
The occurrence of the marine ectoparasitic copepod Lepeophtheirus salmonis and the prevalence of lesions caused by its feeding activities were monitored on sockeye salmon (Oncorhynchus nerka) adults returning to the Sproat and Stamp rivers through Alberni Inlet, British Columbia, in 1990 and 1992-1993. All sockeye examined were infected with L. salmonis and had higher intensities of infection than previously reported. The presence of high numbers of early developmental stages of L, salmonis suggests a high rate of infection for sockeye in coastal waters. Lesions attributable to L, salmonis ranged from minor skin discoloration to large open lesions that exposed the musculature. In 1990, when escapement into these river systems was delayed, sockeye holding in the inlet developed severe lesions and suffered high mortalities. High percentages of fish with open lesions entered both river systems in 1990, but few fish with open lesions were observed on the spawning grounds, suggesting additional prespawning mortality. In 1992 and 1993, when escapement patterns were more normal than in 1990, the severity of lesions owing to L. salmonis was reduced and no mortalities were observed. Throughout the study, fish in the Sproat River escapement had more severe lesions than those in the Stamp River escapement.
引用
收藏
页码:2888 / 2897
页数:10
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