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Migration of Atlantic salmon, Salmo salar L., parr through a Norwegian fjord: potential infection path of Gyrodactylus salaris
Author(s) -
LUND R. A.,
HEGGBERGET T. G.
Publication year - 1992
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1992.tb00779.x
Subject(s) - fjord , salmo , biology , hatchery , fishery , salinity , streams , salmonidae , oceanography , fish <actinopterygii> , ecology , computer network , computer science , geology
. Hatchery‐reared Atlantic salmon, Salmo salar L., parr (0+) ranging in length from 74 to 95 mm were sampled in a stream with no hatchery in its drainage area. No fish had previously been released in this stream. The parr, therefore, had migrated during a period when the salinity of the fjord was between 20 and 30·5% 0 , a minimum distance of 2.7km through the fjord, which was the distance to the nearest hatchery. This is the first observation of pre‐smolt migration between streams via a fjord. Earlier, the salmon in the river had been infected by the monogean Gyrodactylus salaris. Probably, this infection had been spread by parr migrating from a neighbouring stream through the fjord. Parasite dispersion coincided with a period of low fjordwater salinity (12—14.5% 0 ) and sea temperatures ranging from 8.2 to 16.5°C, which is within the suggested tolerance level of G. salaris survival on salmon parr.