. The Canadian field-naturalist. Natural history. 2003 Morton and Williams: Sea Louse on Juvenile Pink Salmon 635. Figure 1. Map of the Broughton Archipelago, British Columbia, study area showing the eight major Pink Salmon-producing rivers, location of salmon farms and general areas where one or more sampling sites were located. 1980) and remain nearshore until they grow to approx- imately cm fork length (Cooney et al. 1978*). Once reaching a length of cm, Pink Salmon move offshore (LeBrasseur and Parker 1964; Cooney et al. 1978*). This transition, accompanied by a shift to lo
. The Canadian field-naturalist. Natural history. 2003 Morton and Williams: Sea Louse on Juvenile Pink Salmon 635. Figure 1. Map of the Broughton Archipelago, British Columbia, study area showing the eight major Pink Salmon-producing rivers, location of salmon farms and general areas where one or more sampling sites were located. 1980) and remain nearshore until they grow to approx- imately cm fork length (Cooney et al. 1978*). Once reaching a length of cm, Pink Salmon move offshore (LeBrasseur and Parker 1964; Cooney et al. 1978*). This transition, accompanied by a shift to lower lipid levels (Parker and Vanstone 1966), is considered "smoking" in Pink Salmon. Hereafter, Pink Salmon fry and smolts will be referred to collectively as juveniles. In early June 2001, a local fisherman delivered a 5 cm juvenile Pink Salmon to us that was heavily in- fested with L. salmonis. Our response was this pre- liminary survey of juvenile Pink Salmon throughout the Broughton Archipelago to document the occur- rence of this unusual infection. Here we report the results of a spontaneously organized survey of seaward- migrating Pink Salmon juveniles in the marine near- shore habitat of the Broughton Archipelago. Methods This study was conducted in the Broughton Archi- pelago, a ca. 400 km2 network with 90 km of narrow passages and 200 km of inlets flushed by a m mean tidal exchange. The Broughton Archipelago is a major natural production area for all native Pacific salmon species (Oncorhynchus sp.), except Sockeye. The eight major Pink Salmon rivers in the Broughton Archipelago collectively produce the fish referred to by Fisheries and Oceans Canada as the Area 12 Mainland Pink stock. This stock is a highly productive portion of even-year cycle Pink Salmon in southern British Columbia. Adult Pink Salmon returns to these eight rivers during 2000 totalled million and over one- half of all Pink Salmon spawning escapement in southern British Columbia (PFR
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
