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- Reinhardt, Ulrich G.; Yamamoto, Toshiaki; Nakano, Shigeru
- Ecological research 2001 v.16 no.2 pp. 327-334
- wild fish, etc ; Hucho; Oncorhynchus masou; body size; juveniles; predation; predators; risk; salmon; streams; Show all 10 Subjects
- ... Competition between masu salmon (Oncorhynchus masou) of wild and aquaculture origin was investigated. Fry were individually marked and released in stream enclosures with and without a piscivorous predator. The aim was to assess the effects of predators and salmon body size on survival and growth of the two types of fish under natural conditions. The presence of predaceous Japanese huchen (Hucho pe ...
- HAKOYAMA, HIROSHI; NISHIMURA, TEIICHI; MATSUBARA, NAOTO; IGUCHI, KEI'ICHIROH
- Biological journal of the Linnean Society 2001 v.72 no.3 pp. 401-407
- wild fish, etc ; Carassius auratus; Trematoda; diploidy; females; gynogenesis; immunoassays; lakes; mortality; nitroblue tetrazolium; parasite load; phagocytes; reactive oxygen species; tanks; triploidy; Japan; Show all 16 Subjects
- ... For coexistence, the sexual form in sexual/asexual complexes needs short-term advantages that can compensate for the two-fold disadvantage of sex. Higher mortality in the asexual form due to a higher parasite load will provide an advantage to the sexual form. In Lake Suwa, Japan, the parasite load (Metagonnimus sp.; Trematoda) of triploid gynogenetic females of Carassius auratus was significantly ...