Chum salmon spawning sequence 2-08
The shape of the redd creates a vortex turbulence in the water current. This keeps the milt circulating around the gravel eggs for quite a while, even after the fish stopped the action. This helps to ensure fertilization of as many eggs as possible.
Photo ID: chum-salmon-spawning-sequence-1-08
© Eiko Jones 2020
Photo size: 15.4 Mpixels (44 MB uncompressed) - 4802x3205 pixels (16.0x10.6 in / 40.7x27.1 cm at 300 ppi)