British Columbia Cumulative Herring Spawn - Overview Maps

Previous page

Map: Cumulative Spawn Overview Map
British Columbia cumulative spawn overview map (all years since 1928)

Figure 1. Circles depict cumulative herring spawn since 1928...Red indicates the top 5%, brown the next 10%, yellow the next 15%, green the next 20%, blue the next 25% and violet the last 25% of ranked statistical areas (Statistical area numbers are shown on the map). See further explanation, a hyperlinked table of the plotted values or previous page.

Hornby Island spawns
Hornby Island spawns

Aerial view of herring spawns along the southeastern shores of Hornby Island.

Click to enlarge 1996 aerial photos.

Map: Cumulative Herring Spawn - Northern British Columbia

Cumulative Herring Spawn - Northern British Columbia

Figure 2. Circles depict cumulative herring spawn since 1928....Red indicates the top 5%, brown the next 10%, yellow the next 15%, green the next 20%, blue the next 25% and violet the last 25% of ranked herring sections (Herring section numbers are shown on the map). See further explanation, a hyperlinked table of the plotted values or previous page.


Map: Cumulative Herring Spawn - Southern British Columbia

Cumulative Herring Spawn - Southern British Columbia

Figure 3. Circles depict cumulative herring spawn since 1928....Red indicates the top 5%, brown the next 10%, yellow the next 15%, green the next 20%, blue the next 25% and violet the last 25% of ranked herring sections (Herring section numbers are shown on the map).  See further explanation, a hyperlinked table of the plotted values or previous page.


Graph

Graph

Figure 4. Blue crosses depict British Columbia (BC) herring spawning dates recorded over the previous 64 years. Considerable overlap exists in the dates of spawning. Southern populations (WCVI & SOG) spawn primarily in early March while northern populations (HG, PRD & CC) spawn mostly in late March and early April. View other scatter plots showing spawning dates partitioned by six regions or by 101 herring sections of BC.

Previous page