Latitudinal variation in egg size and number in anadromous masu salmon Oncorhynchus masou.
Latitudinal variation in egg size and number in anadromous masu salmon Oncorhynchus masou was examined. Relatively greater variation in egg size occurred among rivers than among females within rivers or within females. Egg size was generally greater and egg number generally lower at more northerly latitudes.
Morita
K
K
Hokkaido National Fisheries Research Institute, Kushiro, Japan. moritak@affrc.go.jp
Tamate
T
T
Sugimoto
Y
Y
Tago
Y
Y
Watanabe
T
T
Konaka
H
H
Sato
M
M
Miyauchi
Y
Y
Ohkuma
K
K
Nagasawa
T
T
D000818:Animals; D005260:Female; D005843:Geography; D007564:Japan; D017683:Oncorhynchus / Q000502:physiology*; D010063:Ovum / Q000254:growth & development*; D012098:Reproduction