Salmon Coast：2024海虱对幼年野生鲑鱼的影响研究报告（英文版）（19页）.pdf

1、Sea lice on juvenilewild salmon in the Broughton Archipelago,British ColumbiaSuggested citation:Krichel,L.,Beckert,S.,Metza,B.,Andersen,J.2024.Sea lice on juvenile wild salmon in the Broughton Archipelago,British Columbia in 2024.A report from the Salmon Coast Society.Available from www.salmoncoast.

2、org.20241 Sea lice on juvenile wild salmon 2024 Report|Summary Sea lice are ectoparasites that feed on the skin,blood,and muscle tissues of salmon.They canbe transmitted through larval dispersion between wild and farmed salmon,and cannegatively impact the health of both farmed and wild salmon.Salmon

3、 Coast has been monitoring sea lice on juvenile salmon on a weekly basis throughoutthe juvenile salmon out-migration season at three sites(Glacier,Burdwood,Wicklow)in theBroughton Archipelago since 2001.None of the three sites at which we collect samples had an adjacent active salmon farm thisyear.O

4、f the 24 once-active salmon farms in the Broughton Archipelago,only three remainedactive during the spring of 2024.These farms were located in Clio channel,approximately 40km south of our closest monitoring site.To measure weekly prevalence and sea louse infestation intensity on out-migrating wildju

5、venile salmon in the Broughton Archipelago,we caught up to 50 each of pink and chumsalmon at each site.We examined each juvenile salmon alive in a clear plastic bag.We counted all sea lice(Lepeophtheirus salmonis and Caligus clemensi)present and recorded their life stage,sex,andspecies.We then relea

6、sed the fish alive back into the ocean-mortality from handling wasminimal.We examined a total of 2062 pink and 1010 chum between March 26 and July 15,2024.Of the pink and chum examined in 2024,65%had at least one sea louse,and louse countsaveraged 1.56 lice per fish.Levels of the salmon specialist s