Synopsis of Biological Data on the Chum Salmon, Oncorhynchus keta
Synopsis of Biological Data on the Chum Salmon, Oncorhynchus keta
Synopsis of Biological Data on the Chum Salmon, Oncorhynchus keta
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20<br />
Figure 4.--C<strong>on</strong>struct 0 <str<strong>on</strong>g>of</str<strong>on</strong>g> read antlspawnlng<br />
behavior <str<strong>on</strong>g>of</str<strong>on</strong>g> chum salm<strong>on</strong> (Sano and Naga sawa,<br />
1958),<br />
(a) Male (foreground) and female before redd<br />
c<strong>on</strong>structi<strong>on</strong>.<br />
(b) Female digging redd by turning <strong>on</strong> side,<br />
rapidly flexing body, and fanning streambed<br />
with caudal fin. The female excavated <strong>the</strong><br />
r edd al<strong>on</strong>e and repeated <strong>the</strong> digging moti<strong>on</strong><br />
every 1 to 5 minutes.<br />
(c) From time to timt! during re{\d 'C<strong>on</strong>structi<strong>on</strong>,<br />
<strong>the</strong> male came in c<strong>on</strong>tact with <strong>the</strong><br />
female and exhibited body spasms which<br />
appeared to excite <strong>the</strong> female.
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