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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03513

    Experimental transmission of Caligus rogercresseyi between two different fish species

    M. P. González-Gómez*, L. Ovalle, C. Spinetto, C. Oyarzo, R. Oyarzún, M. Menanteau, D. Álvarez, M. Rivas, P. Olmos

    *Corresponding author:

    ABSTRACT: Caligus rogercresseyi is the dominant sea louse parasite affecting the salmon and trout industry in southern Chile. This parasite has a wide range of native and endemic fish hosts. Patagonian blenny Eleginops maclovinus, which is parasitized mostly by the caligid species Lepeophtheirus sp. and C. rogercresseyi, is presumably responsible for the transmission of C. rogercresseyi to salmonids. The aim of this study was to characterize the transmission of parasites between different fish species and the cohort’s development under laboratory conditions. Quantification of abundances and intensities was performed. The parasite transmission from Patagonian blenny to salmon was lower (~9%, mainly corresponding to C. rogercresseyi) than from salmon to Patagonian blenny transmission (14.7–26.9%, where only C. rogercresseyi were observed). This suggests that the transmission of C. rogercresseyi from salmon individuals is higher than the transmission from a native fish. The cohort of this parasite developed successfully on both fish species, but apparently under different developmental rates. Water temperature, oxygen, and juvenile abundances were the variables that better explained the cohort development success and variation of C. rogercresseyi adult abundances through time