Growth-related morphology of “Kunimasu” (Oncorhynchus kawamurae :Family Salmonidae) from Lake Saiko, Yamanashi Prefecture, Japan
Growth-related morphology of “Kunimasu” (Oncorhynchus kawamurae :Family Salmonidae) from Lake Saiko, Yamanashi Prefecture, Japan
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日本山梨县西湖湖“Kunimasu”（Oncorhynchus kawamurae：鲑鱼科）的生长相关形态
DOI：
10.1007/s10228-013-0382-7
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发表时间：
2014
影响因子：
1.2
通讯作者：
Kai Y
中科院分区：
文献类型：
--
作者：
Nakabo T;Tohkairin A;Muto N;Watanabe Y;Miura Y;Miura H;Aoyagi T;Kaji N;Nakayama K;Kai Y
在日本山梨县西湖的59个标本中发现了“Kunimasu”（Oncorhynchus kawamurae），并与同样来自西湖的58个“Himemasu”（Oncorhynchus nerkain Japan的kokanee）进行了比较。在臀鳍条、胸鳍条、鳃耙（未发现重叠）和幽门盲囊的计数方面，来自西湖的Kunimasu和Himemasu之间存在显著差异（p< 0.01）。与成熟度相关的第二性征在Kunimasu中也被发现，产卵前和产卵期的雄性和雌性比未成熟和成熟个体的身体更压缩。此外，成熟的雄性国增和肥增的体型也不同。国增的体色也因成熟程度而异，两性的婚色在活着时为橄榄绿，在新鲜时为黑色。暗点，发现在CA。40%的国增个体比姬增个体差异小。在西湖，Kunimasu的产卵季节一直持续到冬季和早春，产卵的雄性和雌性留在底部附近，而非产卵个体在白天占据了深水区的上部和中部。
Biological characteristics of “Kunimasu” (Oncorhynchus kawamurae), poorly known even before the species was prematurely believed extinct, have now become apparent following the examination of 59 specimens from Lake Saiko, Yamanashi Prefecture, Japan and comparison with 58 examples of “Himemasu” (kokanee ofOncorhynchus nerkain Japan), also from Lake Saiko. Significant (p< 0.01) differences between Kunimasu and Himemasu from Lake Saiko occurred in counts of anal-fin rays, pectoral-fin rays, gill rakers (no overlap found) and pyloric caeca. Secondary sexual characters related to maturity level were also found in Kunimasu, the body being more compressed in pre-spawning and spawning males and females than in immature and maturing individuals. Furthermore, maturing male Kunimasu and Himemasu also differed in body shape. Body coloration of Kunimasu also differed according to level of maturity, the nuptial coloration in both sexes being olive-green when alive and black when fresh. Dark dots, found in ca. 40 % of Kunimasu individuals examined, were less distinct than in Himemasu. The spawning season of Kunimasu extended through winter and early spring in Lake Saiko, with spawning males and females remaining near the bottom, compared with non-spawning individuals which occupied the upper and middle profundal zones in the daytime.