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- W2189034244 abstract "In Colaco Bay, near to Puerto Montt city (Chile), was implemented a fallowing in all the salmon farms present in the zone by two months (May and June, 2007), as effect of the high incidence of sea lice Caligus rogercresseyi Boxshall & Bravo 2000. This parasite presents three larval stages that habit in the plankton (Gonzalez & Carvajal 2003) during ten to fifteen days, depending this of their nutritive reservoirs and migratory capacity. The impact of the fallowing of Colaco Bay in the water column was evaluated before of the fallowing, during this event and post-fallowing, each fifteen days. Eight salmon farms were monitored; four off the bay and four in the bay. The samples were collected to 0, 5 and 10 meter of depth, with a zooplankton net in the adjacent water to each farm and in its interior. The results showed that: 1) copepodids were present in the zooplankton from 0 to 5 m of depth, never nauplius I and II, 2) exponential decrease of abundance of copepodids from the sampling prefallowing until zeros presence to the 36 fallowing days, 3) copepodids in major abundance in salmon farms situated off the Bay, near to other zone with farms in activities, 4) exponential increase of copepodid abundance during the two months post-fallowing, 5) high correlation (r 2 = 0,7; p< 0.001) between the intensity of copepodids attached to salmonids and their abundance in the zooplankton. Then, we conclude that the copepodids were good biological indicators for to establish the fallowing of the Colaco Bay to 42 days, and that the effectiveness of this measure is conditioned for the sanity of neighbourhood zones. The larvae of Caligidae can be dispersed in concentrations that depend of the tide drift and the wind prevailing (McKibben & Hay 2004), in the Colaco Bay both crucial factors must be studied for to obtain a good fallowing." @default.
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- W2189034244 date "2008-01-01" @default.
- W2189034244 modified "2023-09-27" @default.
- W2189034244 title "Evaluating the fallowing of salmon farms in the zooplankton: Colaco Bay, an example" @default.
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