Abstract
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 F 1 and F x 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 F 1 hybrids tended to be less than in pure masu salmon. However, F x hybrids showed similar body sizes to masu salmon.
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Yamazaki, Y., Shimada, N. & Tago, Y. Detection of hybrids between masu salmon Oncorhynchus masou masou and amago salmon O. m. ishikawae occurred in the Jinzu River using a random amplified polymorphic DNA technique. Fish Sci 71, 320–326 (2005). https://doi.org/10.1111/j.1444-2906.2005.00967.x
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DOI: https://doi.org/10.1111/j.1444-2906.2005.00967.x