Detection of hybrids between masu salmon Oncorhynchus masou masou and amago salmon O. m. ishikawae occurred in the Jinzu River [Japan] using a random amplified polymorphic DNA technique
2005
Yamazaki, Y. (Toyama Univ. (Japan)) | Shimada, N. | Tago, Y.
Identification of masu salmon Oncorhynchus masou masou and amago salmon O. m. ishikawae was accomplished using a random amplified polymorphic DNA (RAPD) technique. Of 80 primers screened, three primers amplified subspecies-specific fragments (OPA11-1095*, OPB5-1618* and OPD5-2038*). Based on fragment patterns, 33 hybrids were detected among 150 upstream-migrating individuals in the Jinzu River, central Japan, a long-time habitat of masu salmon, to which amago salmon were recently introduced. All of the individuals examined in the 2000-2002 cohorts were identified as F1 and Fx, as well as pure masu and amago forms. These results indicated continuing hybridization, the genetic pollution of the native masu salmon population by amago salmon possibly being a serious problem in the Jinzu River. Both standard length and body weight in F1 hybrids tended to be less than in pure masu salmon. However, Fx hybrids showed similar body sizes to masu salmon.
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