Abstract
The value of metazoan parasites of the hake Merluccius gayi as biological tags for stock identification is assessed. Seven hundred and eighty-two hake ( Merluccius gayi gayi), obtained from the four most important landing ports in central and southern Chile (Coquimbo, San Antonio, Talcahuano and Puerto Montt) as well as previously published data on 140 Peruvian hake ( Merluccius gayi peruanus) from Callao, Peru are analyzed. Thirty species of metazoan parasites (22 in Chilean hake, 17 in Peruvian) were obtained. A canonical discriminant function using the most prevalent parasites suggests that the Chilean hake subspecies includes two stocks: a southern stock, associated with the fishing port of Puerto Montt, and a central stock, associated with the fishing ports of Talcahuano, San Antonio and Coquimbo. Identification of stocks is based on significant differences in the mean intensity of adult Clestobothrium crassiceps and larval Hepatoxylon trichiuri (Eucestoda), the monogenean Anthocotyle merlucci and the copepod Neobrachiella insidiosa f. pacifica.
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